Cooling issue is a secondary benefit IMO, the real benefit is the combustion chamber design.All things being equal you can usually run higher compresssion with leaner jetting than you can with the stock head. Those two things alone can make more power, besides any added benefit in combustion process. Plus you can easily get 1/2 your money back out of it when you sell it, try that with porting. So I don't come off as sounding like a sales rep, I will say the stock head works fine in situations like snocross, or on and off the throttle plonking through the trees, slow trails corner to corner etc, in other words situation where wide open pulls aren't in the equation.
I think BJ sells RK TEK heads shipped for 350.00. Not sure what they are from RKT. I see in there kit they say 365 which I dont understand how BJ sells them cheaper then Kelsey(RK TEK). I beileve you also gain some MPG due to smaller jet sizes.
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