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Hypothetical Q: If a person replaced a set of 452's w a set of eddies and the chamber/port dimentions were IDENTICAL on each (1) what would be the difference in performance (if any) and (2) With the aluminum conducting heat faster would that be what would be making this difference (if there's a difference)? and (3) if the eng (w the 452's) was at the ping limit with his current choice of fuel (and his current CR) if the SCR was was raised (w NO other changes) would he be able to run the same octane w no pinging? and (4) if so would there be a gain in power (w the higher CR/alum heads (which'd be wicking away heat)?



A while back someone on here posted a dyno comparasin from one of the hot rod mags of two chevy motors side by side. Built identically, identical heads except one was iron one was aluminum to test this alum vs iron theory. Results on the dyno, no difference between the two. So if you can up the SCR with the alum heads, it's only a win-win situation for you over the irons.