I learned something today. Thanks.
So the crank is "flat", causing one compression cycle every 1/2 turn. With cyls 1 and 4 "paired" as far as coming to TDC at the same time and 2 and 3 "paired". Makes sense.
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic.
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