Re: Sm420 question
The 228 went back further than 47. There is a split in the sn where there is two deck heights needing two different length pushrods. If i remember correctly, the 228 began production in '35-'36 year model. Gmc also produced a 236, 256, 270 (two different block thicknesses) a gi version, and a commercial version. Gm truck division bought from buick their 6 cyl. Casting and rifle-drilled the crankshaft (inserted conn. Rod bearings--not babbit-rod bearings) also full journal oiling.
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