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Holy Crap,I spent my hard earned $$$ buying not just 1 set but 2 sets of 572-13 heads,when I could have save $$$ by using 440-1 heads I just let 1 set go with my spare engine,but you can bet the farm on this I won't be replacing them with a set of 440-1 heads.




I would run another set of -13's anyday, It's not all about flow numbers.




You got that right. So lets start the list of 1000+ hp -13 motors out there I do know of one but it is a BIG motor...

It is your money spend it however you like but IMO there are better valuaes out there than the 572-13 head for the money. As for the OP seems the consensus is to save money and port what you have. If you want to upgrade I think most will agree DONT go to the -13. But we are all likely wrong


"I am not ashamed to confess I am ignorant of what I do not know."

"It's never wrong to do the right thing"