Thanks Jody. Like I told you in the PM I have a 4.38 and you felt it would give appox 10 psi with my combo. I just wanna be conservative out of the gate with it and not stuff 10 psi right away. Should I just put the 4.38 on and keep the rev's down at first and see what it does??? Or just get the bigger pulley and tune from there?? Thanks for all your help!
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69 Camaro
491 BBC
TH400/GV OD
Currie 9"
Rushforth Livewires
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