There is no practical difference between iron and aluminum for heat dispersion. Dyno tests prove it. A few milliseconds is just not enough time for heat to transfer. MOST of the heat goes out the exhaust.
Remember roller cams lose 8* due to lash.
Keep that LSA down to 106*.
.040-.050 squish distance is critical.
Soft-edge everything in the chamber/piston.
Timing curve will be critical as will mixture control.
Water injection is a good idea.
I ran an 11/1 '70 350/350 on 91-93 with water injection. Vortec heads are better.
You could also take some meat out of the chambers.
I suggest looking into the "head grooving" threads on this forum. It works. Automotivebreath is the "expert".
Remember the higher the rpm, the less "clock time" for detonation to occur.
Good luck, be prepared to buy race fuel.
Enginequest makes replacement Vortec heads in different sizes. Check that.
Last edited by ScoTFrenzel; 09-01-2008 at 12:31 PM.