The 3836848 head was used on 54-62 Chevy 235's, according to one source. You must have a Chevy 235 in your GMC (Canadian GMC's used Chevy engines). Check the right side of the block for other numbers: on pad to rear of distributor, over the starter, and down low up front by the fuel pump.


Curt
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1953 Chevy 6400, 1957 Chevy 2dr Sedan
--"Mediocrity is easy, the good things take time"