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The GMC V-6 was around for a few years in various displacements from the mid sixties to around 1972. I would check into a conversion to the GM big block gas truck engines. I drove an older GMC that had been retro fitted with a GM 366 V8 that replaced a 351? V6 and it ran great and looked like it was almost a bolt in. I think the bolt pattern on the bell housing was the same and the motor mounts were adaptable. Many of these chassis served both GMC and Chevy so the holes for the motor mounts should be present. The 427 medium truck engine would be the closest in power to what you have. A 502 V8 is also available. Most of the newer ones come with TBI FI and seem to much more responsive than the old 2bbl carbs were. Make sure you get a "truck" engine for the most service life. If you go with diesel you may have to change out your rear axle ratio to achieve highway speeds and keep the RPMs within specs not to mention modifications to the fuel system. The noise level tends to be high on the front engine flat fronts. That said the diesel does get better fuel mileage and will last longer. Most gas BB Chevys in school bus service seem to last to about 150k.
Best of luck and let us know how it works out.
Rick |
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