My Canadian build 1953 235 engines all have the hand crank balancer on the front of the engine
But that doesn’t necessarily mean the USA models do
Also I’m not sure if the gmc truck has clearance for the crank like the Chevy does
But our Canadian gmc trucks have the Chevy engines with the hand crank balancer installed
Likely it was because to limit skews they just all got the hand crank capable pulley?
I have to check next time im at my truck if the hand crank fits through the gmc grille.
-s
