Engine expansion when hot?

[olddog]

https://www.engineeringtoolbox.com/l...ents-d_95.html

aluminum is about 22 and cast iron is about 11 or aluminum grows twice that of cast iron.

As for your intake, that is the beauty of a 90 deg V block. As things grow longer it is growing half the distance vertically and half the distance horizontally, per head.

I think you are trying to understand your problem, but remember there are thousands of engines like yours. The aluminum/cast iron does make sealing harder, but the gaskets take the slight changes. If this were your only problem then all of these engines would have the same problem.

I mentioned measuring gaps while you had the engine apart in another thread. I think you mentioned doing some checking. Each little thing adds to what the gaskets have to make up for.

You have talked like the ports have been opened up to where there is very little seal surface left. Blown engines they often mil a tiny grove around the cylinder and put a wire in the grove. This bites into the gasket and can hold more pressure. Intakes I have seen rubber O-rings installed. I'm not suggesting this is "thee" solution, but it may be worth considering with some experts.

Oops: I may have original poster confused with someone else. Apologies if so.