IF (big if) you take the water inlet tubes out of the heads be real careful. They are made of unobtainium and are real fragile. 55-6 are made of brass and 57-9 are stainless. Or maybe it is the other way around. 55-6 are the same both sides, 57-59 are side dependent.
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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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