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Old 12-09-2012, 06:13 PM
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Originally Posted by gearheadslife View Post
iron always makes more power than alum..
alum is just easier to cast..
nascar engines make over 80 hp with iron over alum.. but are a one race deal.. when they qualified and pulled engines then ran another in the race iron was the ticket.. but where a one and done part..
What?? Nascar uses alum heads some classes are limited to cast iron but sb2 heads are alum castings. These are 12 degree heads not normal 23 degree.

Are you talking about bowtie heads certainly not nascar worthy but used in all types of circle track racing.

Aluminum is not easier to cast it also is much more expensive. Alum heads transfer heat way batter than cast so you can run higher compression on hotter day out and still avoid knocking if its tuned right of course. Cast is usally a full point lower in compression and still stay in the safe range.
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