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Old April 1st, 2021, 12:13 AM
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Ed Snyder Ed Snyder is offline
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Join Date: Jan 2013
Location: Medford, Oregon
Truck: 1962, 1965, 1967
Posts: 868
Rep Power: 343
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From today's email newsletter:

GMC Trivia
GMC Inline 6-cylinder engines had an easy way to tell the size (cubic inches) of their engines. How can you tell?
Look for the answer at the bottom of this newsletter

GMC Trivia Answer
Starting in 1939, most GMC six cylinder engines have the cubic inch size stamped in as the first three numbers of the stamped engine serial number. The number is stamped on the machined boss near the fuel pump.


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Ed Snyder
Medford, Oregon
1962 1000 Pickup 401M & Muncie 318 with overdrive
1962 K1000 Suburban 401M & SM420
1965 2500 Suburban 351C & SM420 with Watson overdrive
1967 CM1500 pickup 351E & NP435
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