Re: GMC 500 Straight six 1956 Semi

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Posted by Bob M on September 29, 2004 at 05:17:59 from (165.170.128.66):

In Reply to: GMC 500 Straight six 1956 Semi posted by Mopower on September 28, 2004 at 07:46:45:

Sounds like the GMC 503 or 503A straight 6. They powered the largest, non-diesel GMC conventional and COE's of the era. Depending on the setup they were rated from 190 to 225 HP.

Tough old engines, but not noted for their fuel economy!!

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