Home » Public Forums » GMCnet » Aluminum intake manifold-opinions..
| Aluminum intake manifold-opinions.. [message #326163] |
Sun, 19 November 2017 14:02  |
Scott Nutter
Messages: 781
Registered: January 2015
Location: Houston/San Diego
Karma: 4
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Hello,
I might be close to removing the stock intake manifold on my 455, and was wondering the advantages of replacing it with a aluminum intake.
I would only consider the low profile manifold. I will not cut my Hatch cover.
The #1 best thing that I can see would be not ever needing the heat block-off plates, #2 would be a new product without any cracks(hopefully), and #3 would be the weight.
Any other pro's of con's?
I have searched prior post and can only find info for the 403's
Thank you,
Scott.
Scott Nutter
1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, Dave Lenzi super duty mid axle disc brakes, tankless water heater, everything Lenzi. Alex Ferrera installed MSD Atomic EFI
Houston, Texas
[Updated on: Sun, 19 November 2017 16:23] Report message to a moderator |
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| Re: [GMCnet] Aluminum intake manifold-opinions.. [message #326164 is a reply to message #326163] |
Sun, 19 November 2017 14:48  |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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Scott,
If you use an Edlebrock Performer manifold for the 455 you will have to raise the engine cover about 2+ inches. If you use the aluminum manifold that was made for the coach patterened after the factory intake with upgrades it will fit without modes
http://www.appliedgmc.com/prod.itml/icOid/568
https://www.summitracing.com/parts/edl-2151/overview/make/oldsmobile
Not sure if the summit item is the correct, but only one listed for the 455.
JR Wright
Michigan
Buskirk Stretch
> On Nov 19, 2017, at 3:02 PM, Scott Nutter wrote:
>
> Hello,
> I might be close to removing the stock intake manifold on my 455, and was wondering the advantages of replacing it with a aluminum intake.
>
> The #1 best thing that I can see would be not ever needing the heat block-off plates, #2 would be a new product without any cracks(hopefully), and #3
> would be the weight.
>
> Any other pro's of con's?
> I have searched prior post and can only find info for the 403's
>
> Thank you,
> Scott.
>
>
> --
> Scott Nutter
> 1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, tankless water heater, everything Lenzi.
> Houston, Texas
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] Aluminum intake manifold-opinions.. [message #326166 is a reply to message #326163] |
Sun, 19 November 2017 14:59 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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If you consider using the Edelbrock manifold, be sure to review this first:
http://www.gmcmhphotos.com/photos/g3057-cylinder-head-damage-from-exhaust-crossover-plugs.html
Ken H.
On Sun, Nov 19, 2017 at 3:02 PM, Scott Nutter wrote:
> Hello,
> I might be close to removing the stock intake manifold on my 455, and was
> wondering the advantages of replacing it with a aluminum intake.
>
> The #1 best thing that I can see would be not ever needing the heat
> block-off plates, #2 would be a new product without any cracks(hopefully),
> and #3
> would be the weight.
>
> Any other pro's of con's?
> I have searched prior post and can only find info for the 403's
>
> Thank you,
> Scott.
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Aluminum intake manifold-opinions.. [message #326167 is a reply to message #326166] |
Sun, 19 November 2017 16:02 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Our Aluminum intake is a improved unit, Low Profile like the original and
is custom machine to overcome the previous matching of ports and Air
conditioning compressor bracket mount hole location and size. Like the
Edelbrock, the exhaust passage is blocked standard.
On Sun, Nov 19, 2017 at 12:59 PM, Ken Henderson
wrote:
> If you consider using the Edelbrock manifold, be sure to review this first:
>
> http://www.gmcmhphotos.com/photos/g3057-cylinder-head-
> damage-from-exhaust-crossover-plugs.html
>
> Ken H.
>
>
> On Sun, Nov 19, 2017 at 3:02 PM, Scott Nutter
> wrote:
>
>> Hello,
>> I might be close to removing the stock intake manifold on my 455, and was
>> wondering the advantages of replacing it with a aluminum intake.
>>
>> The #1 best thing that I can see would be not ever needing the heat
>> block-off plates, #2 would be a new product without any
> cracks(hopefully),
>> and #3
>> would be the weight.
>>
>> Any other pro's of con's?
>> I have searched prior post and can only find info for the 403's
>>
>> Thank you,
>> Scott.
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Aluminum intake manifold-opinions.. [message #326168 is a reply to message #326167] |
Sun, 19 November 2017 16:09 |
Mike Kelley
Messages: 467
Registered: February 2017
Karma: -2
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Senior Member |
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Jim K.:
I love the way you jump in and give GMC'ers helpful info. Some people would say it is good salesmanship, but I just appreciate that you try to help us at every opportunity!!!
Thanks again,
Mike/The Corvair a holic
Sent from my iPhone
> On Nov 19, 2017, at 4:02 PM, Jim Kanomata wrote:
>
> Our Aluminum intake is a improved unit, Low Profile like the original and
> is custom machine to overcome the previous matching of ports and Air
> conditioning compressor bracket mount hole location and size. Like the
> Edelbrock, the exhaust passage is blocked standard.
>
> On Sun, Nov 19, 2017 at 12:59 PM, Ken Henderson
> wrote:
>
>> If you consider using the Edelbrock manifold, be sure to review this first:
>>
>> http://www.gmcmhphotos.com/photos/g3057-cylinder-head-
>> damage-from-exhaust-crossover-plugs.html
>>
>> Ken H.
>>
>>
>> On Sun, Nov 19, 2017 at 3:02 PM, Scott Nutter
>> wrote:
>>
>>> Hello,
>>> I might be close to removing the stock intake manifold on my 455, and was
>>> wondering the advantages of replacing it with a aluminum intake.
>>>
>>> The #1 best thing that I can see would be not ever needing the heat
>>> block-off plates, #2 would be a new product without any
>> cracks(hopefully),
>>> and #3
>>> would be the weight.
>>>
>>> Any other pro's of con's?
>>> I have searched prior post and can only find info for the 403's
>>>
>>> Thank you,
>>> Scott.
>>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>
>
>
> --
> Jim Kanomata
> Applied/GMC, Newark,CA
> jimk@appliedairfilters.com
> http://www.appliedgmc.com
> 1-800-752-7502
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: Aluminum intake manifold-opinions.. [message #326169 is a reply to message #326163] |
Sun, 19 November 2017 16:30 |
Scott Nutter
Messages: 781
Registered: January 2015
Location: Houston/San Diego
Karma: 4
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Senior Member |
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Ken,
Was there damage because of the crossover plates?
Jim K's aluminum manifold doesn't have crossover ports. I consider that the best reason to change out the manifolds.
Scott.
Scott Nutter
1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, Dave Lenzi super duty mid axle disc brakes, tankless water heater, everything Lenzi. Alex Ferrera installed MSD Atomic EFI
Houston, Texas
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| Re: Aluminum intake manifold-opinions.. [message #326170 is a reply to message #326163] |
Sun, 19 November 2017 17:10 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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Mike you get the sam,e help whether you buy or not.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Aluminum intake manifold-opinions.. [message #326175 is a reply to message #326169] |
Sun, 19 November 2017 21:03 |
Richard Denney
Messages: 920
Registered: April 2010
Karma: 9
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Senior Member |
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Scott,
I still use blockoff plates with my aluminum manifold. The exhaust in our
application can be hot enough to erode aluminum, and the stainless plate
prevents it.
Rick "only 1220-degree melting point" Denney
On Sun, Nov 19, 2017 at 5:31 PM Scott Nutter wrote:
> Ken,
> Was there damage because of the crossover plates?
> Jim K's aluminum manifold doesn't have crossover ports. I consider that
> the best reason to change out the manifolds.
> Scott.
> --
> Scott Nutter
> 1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final
> drive, Quad bags, tankless water heater, everything Lenzi.
> Houston, Texas
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Rick Denney
73 x-Glacier 230 "Jaws"
Off-list email to rick at rickdenney dot com
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| Re: Aluminum intake manifold-opinions.. [message #326176 is a reply to message #326169] |
Sun, 19 November 2017 21:14 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Scott Nutter wrote on Sun, 19 November 2017 16:30Ken,
Was there damage because of the crossover plates?
Jim K's aluminum manifold doesn't have crossover ports. I consider that the best reason to change out the manifolds.
Scott.
The problem Colonel Ken is talking about was due to crossover plugs, NOT Crossover plates.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Aluminum intake manifold-opinions.. [message #326177 is a reply to message #326169] |
Sun, 19 November 2017 21:28 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Scott,
No, the damage shown in my album had nothing to do with crossover plates --
those had not yet been invented. Edelbrock then, and now, insisted on the
use of cast iron plugs, which they supplied in the crossover ports. THOSE
PLUGS are what almost wore through into the water jacket in my cylinder
heads, and DID wear into one of the head bolts.
Ken H.
On Sun, Nov 19, 2017 at 5:30 PM, Scott Nutter wrote:
> Ken,
> Was there damage because of the crossover plates?
> Jim K's aluminum manifold doesn't have crossover ports. I consider that
> the best reason to change out the manifolds.
> Scott.
> --
> Scott Nutter
> 1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final
> drive, Quad bags, tankless water heater, everything Lenzi.
> Houston, Texas
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Aluminum intake manifold-opinions.. [message #326178 is a reply to message #326177] |
Sun, 19 November 2017 22:10 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Mike,
I saw in the discussion that they were ignoring the more functional product.
People that take it as 100% salesmanship can keep on thinking.
I spend considerable time to assist people n/c.
Mike I appreciate your sincere evaluation of my comments.
Our Air Filter division is where we do very strong contribution to our
existence.
On Sun, Nov 19, 2017 at 7:28 PM, Ken Henderson
wrote:
> Scott,
>
> No, the damage shown in my album had nothing to do with crossover plates --
> those had not yet been invented. Edelbrock then, and now, insisted on the
> use of cast iron plugs, which they supplied in the crossover ports. THOSE
> PLUGS are what almost wore through into the water jacket in my cylinder
> heads, and DID wear into one of the head bolts.
>
> Ken H.
>
>
> On Sun, Nov 19, 2017 at 5:30 PM, Scott Nutter
> wrote:
>
>> Ken,
>> Was there damage because of the crossover plates?
>> Jim K's aluminum manifold doesn't have crossover ports. I consider that
>> the best reason to change out the manifolds.
>> Scott.
>> --
>> Scott Nutter
>> 1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21
> final
>> drive, Quad bags, tankless water heater, everything Lenzi.
>> Houston, Texas
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Aluminum intake manifold-opinions.. [message #326179 is a reply to message #326178] |
Sun, 19 November 2017 22:19 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Richard,
You're correct in using a SS plate even if the Al intake has solid block.
In my younger days, on some of our company trucks, I have seen erosion in
the exhaust surface after 80,000 miles.
The fact that the 455 does have a rather large passage from the head can
contribute to concern.
On Sun, Nov 19, 2017 at 8:10 PM, Jim Kanomata wrote:
> Mike,
> I saw in the discussion that they were ignoring the more functional
> product.
> People that take it as 100% salesmanship can keep on thinking.
> I spend considerable time to assist people n/c.
> Mike I appreciate your sincere evaluation of my comments.
> Our Air Filter division is where we do very strong contribution to our
> existence.
>
>
> On Sun, Nov 19, 2017 at 7:28 PM, Ken Henderson
> wrote:
>
>> Scott,
>>
>> No, the damage shown in my album had nothing to do with crossover plates
>> --
>> those had not yet been invented. Edelbrock then, and now, insisted on the
>> use of cast iron plugs, which they supplied in the crossover ports. THOSE
>> PLUGS are what almost wore through into the water jacket in my cylinder
>> heads, and DID wear into one of the head bolts.
>>
>> Ken H.
>>
>>
>> On Sun, Nov 19, 2017 at 5:30 PM, Scott Nutter
>> wrote:
>>
>>> Ken,
>>> Was there damage because of the crossover plates?
>>> Jim K's aluminum manifold doesn't have crossover ports. I consider that
>>> the best reason to change out the manifolds.
>>> Scott.
>>> --
>>> Scott Nutter
>>> 1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21
>> final
>>> drive, Quad bags, tankless water heater, everything Lenzi.
>>> Houston, Texas
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>
>
>
> --
> Jim Kanomata
> Applied/GMC, Newark,CA
> jimk@appliedairfilters.com
> http://www.appliedgmc.com
> 1-800-752-7502
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: Aluminum intake manifold-opinions.. [message #326182 is a reply to message #326163] |
Mon, 20 November 2017 08:16 |
lw8000
Messages: 201
Registered: July 2012
Location: S.E. Michigan
Karma: 1
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Senior Member |
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We replaced our OEM iron manifold with an aluminum only because the OEM one was starting to crack. We went with the Offenhauser (ported and sold by Mondello) which is slightly raised from the OEM so like some mentioned like the Edelbrock, we had to modify the hatch and raise it 0.75 inches and get a lower profile air cleaner housing. We also installed Paterson's block-off kit as well. After all of that, I have not seen any huge or noticeable benefit other than possibly some better acceleration but I have no scientific way to benchmark it. I was hoping for some help with cooling, and vapor lock, which it didn't seem to help with. FWIW.
Chris S. -
77 Kingsley, 3.70 FD, mostly OEM -
S.E. Michigan
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| Re: [GMCnet] Aluminum intake manifold-opinions.. [message #326183 is a reply to message #326182] |
Mon, 20 November 2017 08:27 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Any high rise manifold will aid in giving slightly better acceleration .
Most are designed for higher rpm gains
Sent from my iPhone
> On Nov 20, 2017, at 6:16 AM, Chris S. wrote:
>
> We replaced our OEM iron manifold with an aluminum only because the OEM one was starting to crack. We went with the Offenhauser (ported and sold by
> Mondello) which is slightly raised from the OEM so like some mentioned like the Edelbrock, we had to modify the hatch and raise it 0.75 inches and get
> a lower profile air cleaner housing. We also installed Paterson's block-off kit as well. After all of that, I have not seen any huge or noticeable
> benefit other than possibly some better acceleration but I have no scientific way to benchmark it. I was hoping for some help with cooling, and vapor
> lock, which it didn't seem to help with. FWIW.
> --
> Chris S. -
> 77 Kingsley, 3.70 FD, mostly OEM -
> S.E. Michigan
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: Aluminum intake manifold-opinions.. [message #326184 is a reply to message #326163] |
Mon, 20 November 2017 09:13 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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I have the Gary Rockwell aluminum intake as sold by Applied a few years back. I installed it myself and got the ports sealed well using the Dick Paterson gaskets and SS block-off plates, but I didn't do so well with the end wall seal and had some oil leaks at the front one.
I replaced it for the usual reasons (lighter weight, no exhaust crossovers, no crack like my old one was starting to do, Cool factor, etc). I really didn't expect a performance increase since it is basically a copy of the cast iron manifold made of aluminum, but it may have helped with vapor lock issues (ongoing with this coach no matter what I do to it, it seems).
I recently had my heads replaced and my mechanic did the installation and this time, there are no oil leaks. When I went to get gaskets for it, I talked to Dick Paterson who told me to go with his gaskets due to the minimal thickness of them. The thinner gaskets allow the manifold to sit deeper into the engine allowing the ports to line up better. Made sense to me, so that's what I did.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] Aluminum intake manifold-opinions.. [message #326185 is a reply to message #326180] |
Mon, 20 November 2017 09:51 |
bdub
Messages: 1578
Registered: February 2004
Location: Central Texas
Karma: 5
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Senior Member |
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Arg! How did I type that? I knew it was actually Gary Rockwell. haha I
don't know how the developer of an alternative airbag system got in there.
duh
bdub
On Mon, Nov 20, 2017 at 7:44 AM, Billy Massey wrote:
> Mark Wall used an amazing process to create that manifold. Charles Wersal
> sent him a manifold he didn't need any longer to sacrifice for the greater
> good. Thankfully he documented it faithfully.
>
> http://www.gmcmhphotos.com/photos/g3738-gmc-intake-manifold-project.html
>
> bdub
>
>
> On Sun, Nov 19, 2017 at 5:10 PM, Johnny Bridges via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> Mike you get the sam,e help whether you buy or not.
>>
>> --johnny
>> --
>> 76 26' Eleganza(?) with beaucoup mods and add - ons.
>> Braselton, Ga.
>> "I forgive them all, save those who hurt the dogs. They must answer to
>> me in hell" - ol Andy, paraphrased
>>
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>
>
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bdub
'76 Palm Beach/Central Texas
www.bdub.net
www.gmcmhphotos.com
www.gmcmotorhomemarketplace.com
www.gmcmhregistry.com
www.facebook.com/groups/classicgmcmotorhomes
www.facebook.com/groups/gmcmm
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| Re: [GMCnet] Aluminum intake manifold-opinions.. [message #326186 is a reply to message #326164] |
Mon, 20 November 2017 10:04 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Billy, out West we call those kinds of cranial events, "brain farts". Comes
with having a huge amount of information stored there with a faulty
retrieval system. (Grin) Happens to all of us, if we live long enough.
Jim Hupy
On Nov 20, 2017 7:52 AM, "Billy Massey" wrote:
Arg! How did I type that? I knew it was actually Gary Rockwell. haha I
don't know how the developer of an alternative airbag system got in there.
duh
bdub
On Mon, Nov 20, 2017 at 7:44 AM, Billy Massey wrote:
> Mark Wall used an amazing process to create that manifold. Charles Wersal
> sent him a manifold he didn't need any longer to sacrifice for the greater
> good. Thankfully he documented it faithfully.
>
> http://www.gmcmhphotos.com/photos/g3738-gmc-intake-manifold-project.html
>
> bdub
>
>
> On Sun, Nov 19, 2017 at 5:10 PM, Johnny Bridges via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> Mike you get the sam,e help whether you buy or not.
>>
>> --johnny
>> --
>> 76 26' Eleganza(?) with beaucoup mods and add - ons.
>> Braselton, Ga.
>> "I forgive them all, save those who hurt the dogs. They must answer to
>> me in hell" - ol Andy, paraphrased
>>
>>
>> _______________________________________________
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| Re: [GMCnet] Aluminum intake manifold-opinions.. [message #326187 is a reply to message #326185] |
Mon, 20 November 2017 10:35 |
Richard Denney
Messages: 920
Registered: April 2010
Karma: 9
|
Senior Member |
|
|
I was wondering about that... :)
When we installed Gary's manifold on my new engine, both me and John Beaver
were quite pleased at how light it was. There was no evidence of any
problem after thousands of miles on the old engine.
My only strong recommendation with that manifold is to install studs for
the thermostat housing. Unlike on the iron manifold, the threaded holes
don't penetrate the water jacket and they aren't deep enough for any
standard-length bolt that won't bottom out.
Also, they need high-collar washers on the intake bolts, instead of
standard flat washers, which won't seat on the machined washer surface. I
corrected that issue with the motor, also.
I used the thin gaskets and block-off plates that Dick provides.
Rick "hoping Gary survived that ordeal" Denney
On Mon, Nov 20, 2017 at 10:52 AM Billy Massey wrote:
> Arg! How did I type that? I knew it was actually Gary Rockwell. haha I
> don't know how the developer of an alternative airbag system got in there.
>
> duh
> bdub
>
> On Mon, Nov 20, 2017 at 7:44 AM, Billy Massey wrote:
>
>> Mark Wall used an amazing process to create that manifold. Charles
> Wersal
>> sent him a manifold he didn't need any longer to sacrifice for the
> greater
>> good. Thankfully he documented it faithfully.
>>
>> http://www.gmcmhphotos.com/photos/g3738-gmc-intake-manifold-project.html
>>
>> bdub
>
> --
Rick Denney
73 x-Glacier 230 "Jaws"
Off-list email to rick at rickdenney dot com
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| Re: [GMCnet] Aluminum intake manifold-opinions.. [message #326188 is a reply to message #326187] |
Mon, 20 November 2017 11:04 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
|
Senior Member |
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|
I learned through experience how to install the Rockwell manifold. It is a
great replacement for that cast iron boat anchor that Olds used. There is
one shortcoming. The lower casting on the intake ports is a bit shorter
than the stock iron manifold, and requires very precise placement and
alignment when you install them. Easy to do when the engine is on a stand,
but a bitch when hanging over the hatch. I invert the manifold over a block
on the bench, and spray adhesive onto the intake ports. Then, spray the
gasket with 2 wet coats and apply it to the manifold and align the gasket
with bolts. Leave it overnight. Use "the right stuff" sealant around the
water passages on the 4 corners of the manifold, a big dab on each corner
where the heads meet the block and manifold, and a 3/16" ribbon on the end
walls. Let that tack up a bit, so that it does not stick to your finger.
Then, place the manifold carefully, align the holes with taper punches, and
use new bolts and thick washers. Tighten the manifold using Olds
recommended sequence. If the gaskets slip, your engine will drink oil from
the valley. This is only a problem for the 455. The 403 uses a turkey tray
intake gasket. If you want more details, call me.
Jim Hupy
Salem, Or
On Nov 20, 2017 8:36 AM, "Richard Denney" wrote:
> I was wondering about that... :)
>
> When we installed Gary's manifold on my new engine, both me and John Beaver
> were quite pleased at how light it was. There was no evidence of any
> problem after thousands of miles on the old engine.
>
> My only strong recommendation with that manifold is to install studs for
> the thermostat housing. Unlike on the iron manifold, the threaded holes
> don't penetrate the water jacket and they aren't deep enough for any
> standard-length bolt that won't bottom out.
>
> Also, they need high-collar washers on the intake bolts, instead of
> standard flat washers, which won't seat on the machined washer surface. I
> corrected that issue with the motor, also.
>
> I used the thin gaskets and block-off plates that Dick provides.
>
> Rick "hoping Gary survived that ordeal" Denney
>
> On Mon, Nov 20, 2017 at 10:52 AM Billy Massey wrote:
>
>> Arg! How did I type that? I knew it was actually Gary Rockwell. haha
> I
>> don't know how the developer of an alternative airbag system got in
> there.
>>
>> duh
>> bdub
>>
>> On Mon, Nov 20, 2017 at 7:44 AM, Billy Massey wrote:
>>
>>> Mark Wall used an amazing process to create that manifold. Charles
>> Wersal
>>> sent him a manifold he didn't need any longer to sacrifice for the
>> greater
>>> good. Thankfully he documented it faithfully.
>>>
>>> http://www.gmcmhphotos.com/photos/g3738-gmc-intake-
> manifold-project.html
>>>
>>> bdub
>>
>> --
> Rick Denney
> 73 x-Glacier 230 "Jaws"
> Off-list email to rick at rickdenney dot com
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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