| Intake Manifolds Edelbrock Stock or Mondello others [message #285693] |
Mon, 24 August 2015 01:26  |
jturbo
Messages: 76
Registered: August 2013
Location: Socal
Karma: 1
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Can we start a poll here
Edelbrock (Performer) is this worth the inconvenience and price?
Mondello Same Questions (Also I have read that this and the other intake have fitment issues.
Stocking GM Intake (Is this the best option?
Cross over to block or not block ??
what is best way to block the crossover?
1. Gaskets?
2. Iron Blocks?
3. Metal plates?
4. Fill it ???
1978 Royal 403
1977 Birchaven 455
1977 Kingsley 455
All under Upgrading and restoration
Rosemead California
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| Re: Intake Manifolds Edelbrock Stock or Mondello others [message #285710 is a reply to message #285693] |
Mon, 24 August 2015 04:58  |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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jturbo wrote on Mon, 24 August 2015 02:26Can we start a poll here
Edelbrock (Performer) is this worth the inconvenience and price?
No
Mondello Same Questions (Also I have read that this and the other intake have fitment issues.
There is not a Mondello intake.. Rockwell intake? No
Stocking GM Intake (Is this the best option?
Yes. Or Toronado intake
Cross over to block or not block ??
Block
what is best way to block the crossover?
1) fill the head, 2) fill the intake, 3) use block off plates.
1. Gaskets?
2. Iron Blocks?
3. Metal plates?
4. Fill it ???
C. Boyd
76 Crestmont
East Tennessee
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| Re: [GMCnet] Intake Manifolds Edelbrock Stock or Mondello others [message #285712 is a reply to message #285710] |
Mon, 24 August 2015 06:36 |
Ronald Pottol
Messages: 505
Registered: September 2012
Location: Redwood City, California
Karma: -2
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A note about intake vs exhaust mods. Intake mods only increase power,
exhaust mods often increase efficiency in in most other circumstances as
well as boosting power.
On Mon, Aug 24, 2015 at 2:58 AM, Charles Boyd
wrote:
> jturbo wrote on Mon, 24 August 2015 02:26
>> Can we start a poll here
>>
>> Edelbrock (Performer) is this worth the inconvenience and price?
>> No
>>
>> Mondello Same Questions (Also I have read that this and the other intake
> have fitment issues.
>> There is not a Mondello intake.. Rockwell intake? No
>>
>> Stocking GM Intake (Is this the best option?
>> Yes. Or Toronado intake
>>
>> Cross over to block or not block ??
>> Block
>>
>> what is best way to block the crossover?
>> 1) fill the head, 2) fill the intake, 3) use block off plates.
>>
>> 1. Gaskets?
>> 2. Iron Blocks?
>> 3. Metal plates?
>> 4. Fill it ???
>
>
> --
> C. Boyd
> 76 Crestmont
> East Tennessee
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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--
Plato seems wrong to me today.
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1973 26' GM outfitted
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| Re: Intake Manifolds Edelbrock Stock or Mondello others [message #285713 is a reply to message #285693] |
Mon, 24 August 2015 06:51 |
kerry pinkerton
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma: 15
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There is another option for the 403's. In later years GM introduced an aluminum intake for the small block Olds 350. This is the same block as our 403s. I have one on my coach. I did have to drill and tap a couple holes for various sensors, plug the EGR ports below the carb, and make caps and gaskets for the EGR and choke.
It is a bit taller than the stock manifold and the air cleaner is pretty tight against the unraised hatch. I'm probably going to cut the thickness of the hatch down to compensate. Weights a LOT less. Easy to install by myself.
I used the stainless block off plates.
Kerry Pinkerton - North Alabama
Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L
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| Re: Intake Manifolds Edelbrock Stock or Mondello others [message #285726 is a reply to message #285693] |
Mon, 24 August 2015 09:44 |
Chris Tyler
Messages: 458
Registered: September 2013
Location: Odessa FL
Karma: 7
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A while back I scored a performer at a swap meet. Talked to edelbrock tech guy about it. He said they had no dyno data below 2500 RPM but that there would be 12-15 ft/# dif in torque at 3000-3500 range at full throttle
It would make more at higher RPM but we rarely do there
Oddly enough he said the older edelbrock 2 plane design [C3B?] might be better for our application if you can find one.
Decided it wasnt worth going through with the swap and building a raised engine hatch for the marginal difference unless I needed to pull it anyway
76 Glenbrook
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| Re: Intake Manifolds Edelbrock Stock or Mondello others [message #285771 is a reply to message #285766] |
Mon, 24 August 2015 18:21 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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GeorgeRud wrote on Mon, 24 August 2015 14:55What about the Rockwell aluminum intake manifold patterned from the Toronado intake?
Lynn at Mondello told me Gary Rockwell died and theyy now own the Rockwell manifold and rights?? He said they were a little more then $500 from Mondello? Don't known if it is true or not?
Roy Keen
Minden,NV
76 X Glenbrook
[Updated on: Mon, 24 August 2015 18:22] Report message to a moderator |
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| Re: Intake Manifolds Edelbrock Stock or Mondello others [message #285798 is a reply to message #285766] |
Mon, 24 August 2015 23:56 |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
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GeorgeRud wrote on Mon, 24 August 2015 14:55What about the Rockwell aluminum intake manifold patterned from the Toronado intake?
I have a Rockwell. They are very light which is nice as Kerry mentioned. Grab one of the stock manifolds on the engine and you think it is still bolted down.
I had some trouble getting Rockwell to seal all ports. The first effort sucked 4 quarts of oil in 280 miles. I suggest setting it in place with plastigauge taped on top and bottom of each port. I got 0.002 on all ports the last try. Put two cut-off studs on one side with a notch for a screwdriver cut into the tops. Then when all is ready place it over the two bolts as hinges and swing it down like closing a door.
The Rockwell has no crossover so the blockoff problem is solved, but because I used Patterson gaskets the plate is still there so there is no cavity.
As for extra power? I would not count on it. I have headers and Rockwell intake. I would say at 2500-3000 I notice zero difference. The Rockwell is nice in that it still fits under the deck. I love the fact that the GMC doesn't have a "dog house" between the seats.
Efficiency? Gene Fisher says GMCs get between 8-10 mpg depending of whether you tow or not. After a new engine, manifolds, EFI, I would say a GMC gets between 8-10 mpg depending on whether or not you tow. I did get 10.7 on a 3000 mile trip with a 2.73 (yes that is right) final drive. Very hard on engines and transmissions. Plan on going up some hills in low gear. Probably some hills I would not have been able to climb. You can go 55+ in second gear without hitting 3K RPMs and often you need to. On the other hand, I still have it for when I get a Manny Diesel.
Motorhomes are heavy and push a lot of air. They say in the 70s the GMC was the next slickest vehicle in the GM line other than the Corvette. It still has to push a lot of air out of the way. I am just saying.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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