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Originally Posted by kwmech
A cummins 12v swap in the 67-72 is a really tight squeeze requiring either firewall rebuilding or stretching the front out. PLUS frame work.
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Have you read some of the swap threads in this section? B-series Cummins fit in a 67-72 chassis just fine. No firewall rebuilding, no front stretching, and minimal frame work.
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If I remember right the engine pushes 1200lbs with coolers and everything
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This 1200lbs gets tossed around repeatedly on the internet. Fortunately, I have the Cummins B series shop manual in front of me. Engine weight of a 6BTA with standard accessories is 910 to 970 lbs. The 50lb variation is dependent on the exact accessory setup and whether it has a JWAC. Automotive 6BTAA's don't use the JWAC since they are air-air aftercooled, so figure 950lbs max weight. By comparison, an all-iron big block WITHOUT accessories is 685lbs and a 6.2/6.5L diesel with accessories is about 750lbs.
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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."