here is my situation, i had the car tuned today, seems i lost about 75 horse down the line somewhere from my last dyno pulls. i am having major blowby once i get above 4200 rpm. so bad it looks like a smoke bomb under my hood. so i am gonna do a rebuild this winter. my question is. how much will i gain with a good set of heads. here is my combo. 306, s-trim, e cam. 1.7rr. stock heads mild porting. spyder intake, 42lb injectors. 3:1 fmu. 255 in tank with t-rex. equal lengths, msd 6al. 80mm throttle body, 73 c&l mass air. Current combo made 356rwhp at 11.6 pds of boost.
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