366 + 122hh(3.4)= 12psi, 325 +122hh(3.4)= ??psi
Nov 26, 2008 | 04:57 PM
#11
TECH Veteran
Joined: Sep 2003
Posts: 4,534
Likes: 3
From: Las Vegas, NV
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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