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#1 |
Senior Member
![]() Join Date: Dec 2003
Location: Pampa, Texas
Posts: 1,554
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First time manifold question...
I was getting all the surfaces cleaned up and ready for gasgets last night and i decided to put the manifold on there with no gaskets (just to check fit) and i noticed somthing that caught my eye.. (bear with me) where the exaust crossover is in the head there are ports around it.. and oil is in there.. well my manifold only covers the bottom part of those ports.. but the gasket covers them up all the way (i checked)... is this a problem.. i just thought it was wierd... here are a few pics of what i am talking about...
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#2 |
Registered User
Join Date: Jul 2000
Location: NC
Posts: 987
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Set the gaskets AND mainfold on and see if there is a better match of the ports.
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#3 |
Nothing fits but the oil
Join Date: Mar 2003
Location: Gaston, Indiana
Posts: 424
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Whew..don't know about that. Looks like too much exposed area for a gasket to take care of. Unless maybe the gasket set comes with the steel block-out like some small block kits do. Looks too goofy to me though......
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#4 |
Registered User
Join Date: Jul 2000
Location: NC
Posts: 987
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Do you have extra thick head gaskets under the heads right now? Are the bolt holes from the manifold into the head off by the same amount as the ports? Are the heads and manifold original?
Last edited by Alex Hayley; 04-20-2005 at 01:54 PM. |
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#5 |
Registered User
![]() Join Date: Feb 2001
Location: East Central, MO
Posts: 11,336
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That just doesnt look right........
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#6 |
72 C30 Trailer Queen
Join Date: Dec 1999
Location: SE MN, USA
Posts: 794
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In looking at edelbrock's web pages, it looks like the Performer RPM Air-Gap is offered in 2 different part numbers:
7561 for 1975 and earlier oval ports or 7562 for rectangular ports Could this be the problem? (wrong intake for heads?)
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Chris H 72 C30 133" 72 C30 157" flat-dump 69 C10 short fleet 71 ElCamino 2000 K2500 crewcab shortbed (sold, sorry old friend) 2005 GMC 2500HD shortcrew Duramax 2006 K1500 RCSB and a couple other projects/parts |
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#7 | |
Nothing fits but the oil
Join Date: Mar 2003
Location: Gaston, Indiana
Posts: 424
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Quote:
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#8 | ||
Senior Member
![]() Join Date: Dec 2003
Location: Pampa, Texas
Posts: 1,554
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Quote:
Quote:
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#9 |
Member since 2000
Join Date: Dec 2000
Location: Mountain View Ca / Mexico
Posts: 7,879
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have you called there tech line?
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#10 |
Senior Member
![]() Join Date: Dec 2003
Location: Pampa, Texas
Posts: 1,554
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I have the part number 7561, and the gaskets will cover it up when put on, but just like mudder said, it just doesn't look right.. i am curious what are those holes...
Here is the combo that i have.. this is basically stock motor.. Heads....#336781 Manifold... #7561 Gaskets...Fel-Pro #1210
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https://www.ebay.com/itm/29620574751...mis&media=COPY Last edited by '70_402; 04-20-2005 at 03:29 PM. |
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#11 |
Weekend Warrior
Join Date: Oct 2004
Location: CT
Posts: 1,787
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don't worry about it. mine looked like that too.
once i put the intake gasket on it covered the hole and i don't think that passage goes anywhere...the small hole in the middle does...but the surrounding one doesn't. scared me too when i put my BBC together and i asked someone who's been a chevy guy for 40years said yeh that's how some of them are..and he was scared the first time he saw it too.
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#12 |
Nothing fits but the oil
Join Date: Mar 2003
Location: Gaston, Indiana
Posts: 424
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Forgot about the large ovals.
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Land of the free Because of the brave |
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#13 |
Registered User
Join Date: Dec 2004
Location: Green Bay, WI
Posts: 44
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bb heads
it's normal, nothing to worry about.
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#14 |
Registered User
Join Date: Jan 2004
Location: Elmira, Oregon
Posts: 449
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That's the way the big block heads are. The opening the arrow point to doesn't go anywhere or do anything except collect debris. Like you said, it was filled with oil. Likely just seepage from the valve cover over the years. Clean it out real well then use a sticky gasket adhesive in that area so the intake gasket will keep it sealed up. Has nothing to do with square vs. oval port.
We've all been through this once. Last edited by mr402; 04-21-2005 at 11:47 PM. |
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