Alloy heads

IQ52 said

Everyone agrees that aluminum transfers heat faster and so we assume it has a measurable effect in an internal combustion engine. Who has tested it in an internal combustion engine and reported the results? All of those "experts" claim something and none of them show any actual tests in an engine. Show me the tests!!!!! Here are mine! Where are yours/theirs?

Iron vs. Alloy Engine Heads - Tech Article - Chevy High Performance Magazine

Comparing Aluminum And Iron Cylinder Heads - Car Craft Magazine

Click to expand...

Ok so thanks for posting those up again, I read them. In the Chevy HiPerf article the the aluminum heads have a 7 cc larger intake port and CNC combustion chambers which is usually a benefit--in terms of octane tolerance they don't mention anythingn to that end. In the Car Craft article they admit that with the big cam and only 185 psi cranking compression it didn't even exhibit detonation with the iron heads so it sure as heck wouldn't with the aluminum. If they built the engine to run the iron heads into an octane limited condition then maybe they would have been able to detect a difference when switching to the aluminum heads. But they didn't . Magazine dyno articles also never discuss the engines "personality". J.Rob