intake manifold on 454
Thread Starter
Instructor
Joined: Mar 2005
Posts: 156
Likes: 2
From: collingswood nj
intake manifold on 454
im putting my BB back together after a rebuild and i couldnt do it with out the info of this forum.
I have another build question after installing my heads i placed the intake manifold to test fit. Im using a elderbrock performer 2 intake and after setting it in place there seems to be 2 long holes on the heads one on each side right in the middle that the intake doesnt cover up is this normal this is the same manifold i took of the engine
I have another build question after installing my heads i placed the intake manifold to test fit. Im using a elderbrock performer 2 intake and after setting it in place there seems to be 2 long holes on the heads one on each side right in the middle that the intake doesnt cover up is this normal this is the same manifold i took of the engine
Le Mans Master
Joined: Jun 2008
Posts: 5,284
Likes: 235
From: Rockledge FL
im putting my BB back together after a rebuild and i couldnt do it with out the info of this forum.
I have another build question after installing my heads i placed the intake manifold to test fit. Im using a elderbrock performer 2 intake and after setting it in place there seems to be 2 long holes on the heads one on each side right in the middle that the intake doesnt cover up is this normal this is the same manifold i took of the engine
I have another build question after installing my heads i placed the intake manifold to test fit. Im using a elderbrock performer 2 intake and after setting it in place there seems to be 2 long holes on the heads one on each side right in the middle that the intake doesnt cover up is this normal this is the same manifold i took of the engine
Melting Slicks
Joined: Mar 2005
Posts: 2,838
Likes: 10
From: Austin TX
The intake sometimes sits on the heads funny when you set it down, but once it's bolted down, everything should mate up.
Also, some of the intake bolts require thread sealer (Permatex makes a good high-temp thread sealant). And, smear some RTV on the heads around the water passages. Also, it wouldn't hurt to smear some RTV on the heads just below the intake ports to further prevent oil being sucked into the combustion chamber.
Lastly, most are using a 3/8" bead of RTV in place of the end gaskets. I'm partial to Permatex Gray.
Good luck!
Also, some of the intake bolts require thread sealer (Permatex makes a good high-temp thread sealant). And, smear some RTV on the heads around the water passages. Also, it wouldn't hurt to smear some RTV on the heads just below the intake ports to further prevent oil being sucked into the combustion chamber.
Lastly, most are using a 3/8" bead of RTV in place of the end gaskets. I'm partial to Permatex Gray.
Good luck!
Advanced
Joined: Oct 2007
Posts: 59
Likes: 0
I think thats the exhaust cross over port that heats the manifold. I had this problem on my 67 400sb firebird. Seems the year heads I had would not fit the new elderbrock manifold in this area,everything else match up. I made and added block off plates to seal.
My problem was a head and block year mis match.....not a surprise on a 40 year old car. This 67 was BUBBA's personal test car.
I was not aware that a chevy BB could have the same problem.
Good luck
My problem was a head and block year mis match.....not a surprise on a 40 year old car. This 67 was BUBBA's personal test car.
I was not aware that a chevy BB could have the same problem.
Good luck
Pro
Joined: Apr 2008
Posts: 596
Likes: 6
From: Irving Texas
Yes, the exhaust cross-over port is kinda funky looking on the big-block heads.
It looks like a square inside a square. All you have to do is seal the inner square....which is what the intake does. The outer square and the space next to it is just casting...nothing flows inside this section...therefore, no sealing is needed.
It looks like a square inside a square. All you have to do is seal the inner square....which is what the intake does. The outer square and the space next to it is just casting...nothing flows inside this section...therefore, no sealing is needed.
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Melting Slicks
Joined: Mar 2005
Posts: 2,838
Likes: 10
From: Austin TX
Fel-Pro makes an intake gasket set that blocks the exhaust crossover. It has a square piece of tin that blocks the flow. This will prevent needless heating of the carb, intake, and intake charge (needless, unless you often drive in the great white north).
I highly recommend it.
I highly recommend it.
