Home » Public Forums » GMCnet » [GMCnet] Correct 455 Valve Covers
| [GMCnet] Correct 455 Valve Covers [message #147548] |
Sun, 23 October 2011 18:02  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
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G'day,
If anyone is looking for a correct set of valve covers for a GMC there's a pair on eBay: 290621086772
Regards,
Rob M.
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Correct 455 Valve Covers [message #147549 is a reply to message #147548] |
Sun, 23 October 2011 18:08  |
fred v
Messages: 999
Registered: April 2006
Location: pensacola, fl.
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| Robert Mueller wrote on Sun, 23 October 2011 18:02 |
G'day,
If anyone is looking for a correct set of valve covers for a GMC there's a pair on eBay: 290621086772
Regards,
Rob M.
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i tried throwing some money at my oil consumption problem by getting some correct valve covers. didn't do a thing for me.
Fred V
'77 Royale RB 455
P'cola, Fl
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| Re: [GMCnet] Correct 455 Valve Covers [message #147600 is a reply to message #147560] |
Sun, 23 October 2011 21:05 |
rickmike
Messages: 252
Registered: September 2011
Location: United States
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Why would different valve covers have any effect on oil consumption? Any thoughts?
As long as the PVC valve is working properly then I don't see why there would be any difference!
Rick M.
1974 26' Canyonlands
aka "The General"
Clinton, TN
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| Re: [GMCnet] Correct 455 Valve Covers [message #147605 is a reply to message #147600] |
Sun, 23 October 2011 21:17 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Rick,
Theory has it that the long baffles in the original style valve covers prevent the PCV valve from sucking oil out as easily.
Dennis
| rickmike wrote on Sun, 23 October 2011 21:05 |
Why would different valve covers have any effect on oil consumption? Any thoughts?
As long as the PVC valve is working properly then I don't see why there would be any difference!
Rick M.
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Correct 455 Valve Covers [message #147624 is a reply to message #147608] |
Sun, 23 October 2011 22:22 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
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| Robert Mueller wrote on Sun, 23 October 2011 19:16 |
...
I personally am not saying that it does, I am saying that's what I remember reading here. ...
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Of course it was stated on "the net" so it has to be true!
But it this case, I actually think there is something to this. Why would they spec a different valve cover (from the Toro) if it didn't make SOME difference? To use as many off the shelf parts, they even tried to use the car hubs!
This type of system might tell you for sure:
<http://www.gmcmhphotos.com/photos/showphoto.php?photo=21956>
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] Correct 455 Valve Covers [message #147645 is a reply to message #147624] |
Mon, 24 October 2011 08:53 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Mike,
I'm just about to hit the hay and reading this made me laugh.
It's like the products that state in their print ads "as seen on TV!"
Regards,
Rob M.
-----Original Message-----
From: Mike Miller
Robert Mueller wrote on Sun, 23 October 2011 19:16
> ...
> I personally am not saying that it does, I am saying that's what I remember reading here. ...
Of course it was stated on "the net" so it has to be true!
But it this case, I actually think there is something to this. Why would they spec a different valve cover (from the Toro) if it
didn't make SOME difference? To use as many off the shelf parts, they even tried to use the car hubs!
This type of system might tell you for sure:
<http://www.gmcmhphotos.com/photos/showphoto.php?photo=21956>
--
Mike
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Correct 455 Valve Covers [message #147657 is a reply to message #147644] |
Mon, 24 October 2011 10:55 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Thanks, Wally. I'm sure Fred would like to hear how your spark plugs looked
BEFORE you corrected the oil consumption.
Ken H.
On Mon, Oct 24, 2011 at 9:42 AM, Wally Anderson <wallyand@aim.com> wrote:
>
> Ken, I took the separator off. I was hoping oil was going into the intake
> due to pcv or cover baffle issues but that was not so. After installing K
> Line bronze valve guides oil consumption went way down.
> --
>
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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] Correct 455 Valve Covers [message #147707 is a reply to message #147675] |
Mon, 24 October 2011 17:51 |
fred v
Messages: 999
Registered: April 2006
Location: pensacola, fl.
Karma: 0
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| wally wrote on Mon, 24 October 2011 14:04 |
| Ken Henderson wrote on Mon, 24 October 2011 10:55 |
Thanks, Wally. I'm sure Fred would like to hear how your spark plugs looked
BEFORE you corrected the oil consumption.
Ken H.
On Mon, Oct 24, 2011 at 9:42 AM, Wally Anderson <wallyand@aim.com> wrote:
>
> Ken, I took the separator off. I was hoping oil was going into the intake
> due to pcv or cover baffle issues but that was not so. After installing K
> Line bronze valve guides oil consumption went way down.
> --
>
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Well plugs were kind of cruddy but it was using oil so they should have been. I don't remember them being wet or anywhere near fouled enough to misfire. I don't remember any plug looking different from the others. I think I reused them after the head change and they are still going. Short version is none of the plugs looked that bad in my opinion.
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Wally, i use a qt. every 300 miles. i changed the valve seals to the positive seal type with no improvement. my plugs have always been very white on the porcelain. must be piston rings.
Fred V
'77 Royale RB 455
P'cola, Fl
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| Re: [GMCnet] Correct 455 Valve Covers [message #147715 is a reply to message #147707] |
Mon, 24 October 2011 18:51 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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A quart every 300 miles is excessive consumption. Start by loosening all
your spark plugs on a cold engine. Tighten them to seat, and 1/4 turn more.
Start the engine and warm it up. Remove all the plugs and one by one cleck
the dry compression pressure in all cylinders by turning the engine over
with the starter a minimum of 5 revolutions. Be sure to block the throttle
wide open during testing, and remember to remove the blocking before you
start the engine again. Watch the compression gage as you crank. It should
reach maximum reading in two RPMs. Record the readings as you do them. Be
sure if you have HEI to disconnect the primary ignition wire when cranking.
When finished with the dry check, one at a time using a pump oiler, squirt a
couple of squirts in each cylinder and take your compression readings again.
If your rings are not sealing, the readings should be quite a lot higher
than the dry test. If little change is seen between wet and dry tests, then
rings are probably OK. Then look for leaks, or an improperly fitted intake
manifold, or perhaps an overfilled crankcase (improperly calibrated
dipsticks are very common on GMCs) You should not be using that much oil. 1
qt per 1000 mi is quite normal.
Jim Hupy
Salem, OR
78 GMC Royale 403
On Mon, Oct 24, 2011 at 3:51 PM, fred veenschoten <fredntoni@cox.net> wrote:
>
>
> wally wrote on Mon, 24 October 2011 14:04
> > Ken Henderson wrote on Mon, 24 October 2011 10:55
> > > Thanks, Wally. I'm sure Fred would like to hear how your spark plugs
> looked
> > > BEFORE you corrected the oil consumption.
> > >
> > > Ken H.
> > >
> > > On Mon, Oct 24, 2011 at 9:42 AM, Wally Anderson <wallyand@aim.com>
> wrote:
> > >
> > > >
> > > > Ken, I took the separator off. I was hoping oil was going into the
> intake
> > > > due to pcv or cover baffle issues but that was not so. After
> installing K
> > > > Line bronze valve guides oil consumption went way down.
> > > > --
> > > >
> > > _______________________________________________
> > > GMCnet mailing list
> > > Unsubscribe or Change List Options:
> > > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> >
> > Well plugs were kind of cruddy but it was using oil so they should have
> been. I don't remember them being wet or anywhere near fouled enough to
> misfire. I don't remember any plug looking different from the others. I
> think I reused them after the head change and they are still going. Short
> version is none of the plugs looked that bad in my opinion.
>
> Wally, i use a qt. every 300 miles. i changed the valve seals to the
> positive seal type with no improvement. my plugs have always been very white
> on the porcelain. must be piston rings.
>
> --
> Fred V
> '77 Royale RB 455
> P'cola, Fl
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: [GMCnet] Correct 455 Valve Covers [message #147762 is a reply to message #147715] |
Tue, 25 October 2011 08:28 |
fred v
Messages: 999
Registered: April 2006
Location: pensacola, fl.
Karma: 0
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Senior Member |
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| James Hupy wrote on Mon, 24 October 2011 18:51 |
A quart every 300 miles is excessive consumption. Start by loosening all
your spark plugs on a cold engine. Tighten them to seat, and 1/4 turn more.
Start the engine and warm it up. Remove all the plugs and one by one cleck
the dry compression pressure in all cylinders by turning the engine over
with the starter a minimum of 5 revolutions. Be sure to block the throttle
wide open during testing, and remember to remove the blocking before you
start the engine again. Watch the compression gage as you crank. It should
reach maximum reading in two RPMs. Record the readings as you do them. Be
sure if you have HEI to disconnect the primary ignition wire when cranking.
When finished with the dry check, one at a time using a pump oiler, squirt a
couple of squirts in each cylinder and take your compression readings again.
If your rings are not sealing, the readings should be quite a lot higher
than the dry test. If little change is seen between wet and dry tests, then
rings are probably OK. Then look for leaks, or an improperly fitted intake
manifold, or perhaps an overfilled crankcase (improperly calibrated
dipsticks are very common on GMCs) You should not be using that much oil. 1
qt per 1000 mi is quite normal.
Jim Hupy
Salem, OR
78 GMC Royale 403
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thanks Jim. i only did the dry test. i've also made up a cyl. leak down tester that i want to try. i'll post results.
Fred V
'77 Royale RB 455
P'cola, Fl
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