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Old April 1st, 2023, 09:54 PM
Prowbar Prowbar is offline
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Join Date: Dec 2020
Location: Friesland, the Netherlands
Truck: 1965 GMC 1500, 478 V6, SM420
Posts: 386
Rep Power: 183
Prowbar is a jewel in the roughProwbar is a jewel in the roughProwbar is a jewel in the roughProwbar is a jewel in the roughProwbar is a jewel in the roughProwbar is a jewel in the rough
Default Re: 401M - HEI and Holley carb upgrade

Quote:
Originally Posted by IdahoFarmboy View Post
I'm not sure Prowbar, all I know is I bought it this way in 2006. It wouldn't surprise me if it was swapped at some point. Originally it ran off of propane before my time with it. The serial number on the engine is 401M021200. She runs pretty good but don't know how to compare with the 305. It's no powerhouse that's for sure if you compare with the diesels of today.
Yes, the modern turbo diesels are unmatched. But these are the 'diesels' of the 1960's, low RPM high torque truck engines. Gas engines with a diesel behavior.
At least that is how I view them.
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