[mudchucker]

what have you guys with aftermarket heads experienced with heat build up on Aluminum heads? I have heard to keep cast heads if i am running at all hot, but i have also heard Aluminum isn't as bad as most people think if i run hot. Right now i get up to 230- 240 for periods of time and haven't had any problems at all. I guess my other question is at what temp. should i get concerned?

Thanks