Re: 12 valve swap!
Are you wanting to put a 12V in a ½ ton? If so, it is a bad idea unless you box and reinforce the frame.
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1991 V1500 Blazer (Silverado), 5.9L 12V P-pumped Cummins (5x .012 sac injectors, #6 fuel plate, WH1C with external 38mm wastegate running 30psi), NV4500 with 1-⅜" input shaft, SBC Con-O clutch, NP205, HAD, 4.10 D61/14BFF spinning 37" Nitto Exo's
"I got a shotgun, a rifle, and a four wheel drive and a country boy can survive."
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