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. Yes Sir. That is definitely the problem and no gasket is the solution. Sounds like you have the right guy willing to solve your problem. I am almost sure that Left Side GM Part# 12564565 and Right side – GM Part# 12564564 are what you need. The picture you attached in your initial post...

. The KEY is throwing out the cork gaskets that generally are used and CLEAN (really well) the head and use flexible gasket maker (something similar to RTV) ro seal the covers to the heads. Problem is that the gasket material - rubber or cork - eventually need to be compressed more and the...