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Old 06-11-2015, 10:28 PM   #3
dwcsr
Hollister Road Co.
 
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Join Date: Apr 2005
Location: Houston
Posts: 6,134
Re: GMC engine identification

The problem is that they never used a B in a serial number. It was A then C skipping B
Your serial number for 1950 should start with an FC and most all in that year were 228 CI except the FC 350 series. Look on the door post for a plate
it could have been swapped out for a 270 at some point. get the casting number on the block
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