The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

HemiChallenger71 · 01-04-2015, 09:38 PM

You have to have the valve springs to.

Modded hx35 or modded he351cw 35-40lbs. boost, bump the timing and playing with the plate and screws and your near 500hp.

01-04-2015, 09:38 PM	#31
HemiChallenger71 Registered User Join Date: Oct 2014 Location: Metro Detroit, MI Posts: 202	Re: 67 c30 cummins swap You have to have the valve springs to. Modded hx35 or modded he351cw 35-40lbs. boost, bump the timing and playing with the plate and screws and your near 500hp.