Re: GMC Truck Engine

Posted by JDknut on January 01, 2006 at 10:32:40 from (69.202.149.90):

In Reply to: GMC Truck Engine posted by 37 chief on December 31, 2005 at 23:20:58:

If you could pinpoint it with a series designation, we could tell you exactly what it is. 6-cylinder medium-duty (I assume that is the size range of the truck) GMC truck engines of that late 60's to mid '70's era cover a wide range as that time frame spans the change over from the unique to GMC V-6 to the same engines that Chevy used. It could be a V-6 of 305, 351, 401, or 478 cubic inches depending on the size of the truck. The inline sixes would be the 250 (not too likely in a medium duty truck as it is so small) or 292. By the mid 70's, GMC was using the same engines as Chevy in their mediums: 292 (6), and V-8's 350, 366, 427 CID. Before 1960, when GMC went to the V-6, there were a plethora of inline sixes with rounded valve covers: 228, 248, 270, 302, 360, 426, and 503 cubic inches. The 302 was used widely in Army trucks.

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