Originally Posted By 72Swinger
That iron Block may have more HP capacity than aluminum.
iagree
I know several heads up N/A and power adder racers that switch from filled aluminum blocks to either cast Compact iron or cast grey iron filled blocks and ended up going quicker and faster with the heavier iron blocks shock work shruggy

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)