Re: V6 in a 1970-72 Jimmy?
As far as the Pontiac OHC cam inline six the 230 version shared the same bottom end as far as crankshaft rods & pistons s the Chevrolet six. The rest of the engine including the bellhousing pattern are traditional Pontiac or "BOP". The 250 OHC version that came out in 68 had a whole new bottom end based on Pontiac's V8. The only time GMC used Pontiac sixes was back in the 30's when they were Flatheads.
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