Big block manafold problem!
I have a big block I have been trying to fix a problem with the manifold.
the engine is a 502 bbc with world products heads.
the manafold is from the original 427 that was in the car.
the problem is the intake gasket always leaks in the cam valley. I have replaced it several time and it still leaks after a long drive.
I found out thru checking, the manafold when installed is not sitting deep enough into the block to seal the ports. When looking at the old gaskets. the sealing surface is about 1/16 or a bit wider on the bottom of the manafold ports.
I tried a aftermarket manafold and it seems to match the ports better.
The customer is particular and with the aftermarket manafold, I have to use a really low profile air cleaner to clear. ( it is a 66 vette )
He is wondering why an aftermarket manafold will work and not the one on from the old 427. I am wondering the same.
anybody run into this? I told him the heads may have been cut, but that still does not figure whay the aftermarket one works.
the gasket is a square bore 1/16 thick.
thanks
Al