366 + 122hh(3.4)= 12psi, 325 +122hh(3.4)= ??psi
#11
TECH Veteran
An MP122 with a 3.4" pulley and a stock crank pulley should be about 8-10psi on your 5.3L. In this weather I'd say closer to 10psi at 6000rpm. You will likely need better valve springs even with a stock cam at that boost level.
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