Thread: Intake manifold sealing issues

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Originally Posted by Dave Severson

doesn't really make sense that it would only do it at idle!

If it's oiling at idle, then it's oiling at all rpm's. The oil smoke would just be diluted at upper rpms with additional exhaust air, so that it wouldn't be so noticeable.

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Woo Hoo I made 3 posts??? In one day?? Can it be real???

Ok finally found the issue and a fix. Took manifold off cleaned everything up then dry fitted the Edelbrock manifold. The manifold rested on the china walls with no gap this was without gaskets. With .060" gaskets the gap was about 1/16", my feeling was this was not right. I purchased .060" gaskets and .120" gaskets. With the thinner gaskets the bolt holes on the heads were at the bottom of the bolt holes on the manifold. The bolts would go in easily and the manifold would bolt down easily. With the thicker gaskets I noticed the bolt holes lined up right in the middle, as they should. I used the thicker gaskets and the china wall gap is now around 3 /16" so I bolted the manifold down. My problem is now fixed no more vacuum leaks or oil burning.
I'm gonna guess that sometime in this engines life the heads, block or both had been milled. I've dealt with milled heads and blocks but in my experience the manifold to head bolt alignment is so off the bolts won't thread into the heads when using the .060" gaskets so a thicker one aligns it up. I just presumed since the manifold bolted on so easily everything was normal. So don't assume anything always confirm, Hope this helps someone else.