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I was looking at aluminum heads and came across these ProMaxx heads . The little bit of info that i found were people that just got them and loved them or shops getting ready to port them . They all say good things about them as out of the box head . one shop said that they were one of the best...

HI HAVING PROBLEM AT THE STRIP ONLY ON THE STREET ITS FINE. My 1970 340 duster 4 speed Hughes cam and springs duration at 50 is only 230 with 545 lift 9.5 compression , Weiand act plus intake. 3.73 rear gears 2.02 casts heads . This is the problem when i come off the line at 3500rpm the...