Ported 452 or Edelbrock RPM

IQ52 said

How many of you have used a single layer thin steel head gasket with an aluminum head on an iron block and have had problems? Huh? Or are you just talking about something you have never tested? Repeating rumors? I have never tried it, so any response from me would have no validity.

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I did it one time, for a hemi that was going to Austrailia. IIRC, they were a Fel-Pro shim gasket and naturally, they had a batch that were stamped wrong. The customer brought in all his own parts, including the head gaskets.

On the dyno we had an oil leak. After screwing with it for awhile I pulled the heads. When they stamped the gasket, they put a runner (I *THINK* that is what the guy at Fel-Pro called them) out of place right where it passed by an oil feed hole.

Pressurized oil would go out into that runner (channel) and leak it out at the back of the head. Fel-Pro sent out a corrected gasket and all was well. Those runners are supposed to capture air and when the head is torqued that is what seals the head as it tries to move away from the block.

I have done many aluminum intakes on cast iron heads and never had an issues but everything has to be clean and flat. I don't tell other people to do it because it's easy to screw up.