Thread: Help decoding big truck vin and engine code
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Old November 12th, 2019, 03:59 PM
jagarra jagarra is offline
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Default Re: Help decoding big truck vin and engine code
I am using a "Motors Truck Repair " manual as a reference, 17th edison. In 1960 they list the motors for school buses, series S50-S70 the smallest motor is a S50 series with a 235, the rest have either a 261 or 283.
Maybe the motor mount position will let you have an idea of what was in there 6 or V8.

Your S503 could indicate a 50 series. Seating capacity could be a factor for bigger motors.
I have a 60-66 Chevy/GMC assembly manual and it has the vin information, but in your case I just could not find the vin info that matched.
Last edited by jagarra; November 12th, 2019 at 04:05 PM.
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