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everything you can think of is done to the heads. it is just covered up and blended to look "as cast". half the money is jsut in parts, titanium **** costs dough.
these motors are not very advanced, but they are researched to hell. every shop has a "secret" cam and no head service will realease any flow numbers.
basically, if you actually built an engine with in the rules, or even with in site of the rules, you wouldn't have a snowball's chance in hell of winning.
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