FUN304
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I think 3.25" is from the states as they have 2 different types of 8 rib pulleys for vortechs. I had the same dramas with them awhile ago, all depends who you talk to. 2.95" should see 11-12@blower so then it all depends on cooler loss, I have been told by many people who have been through it before that 3psi is a normal loss anyway. You'd be right with 12psi on staock motor anyway I reckon, when I had mine pulled down to stroke it the engine builder said it looked fine. Good luck anyway and enjoy