Join Date: Jan 2015
Location: Injun Territory, 'Merica!
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Pontiac dealers didn't install a later date same two letter code block or shortblock for warranty work. IF a dealer did replace a block, they did so with a fitted SR (Service Replacement) block, i.e; machined block, fitted pistons with rings. The dealer could also order bare cyl heads from Parts Distribution, if the blown engine took out a cyl head(s), then the head's and engine were assembled in the dealership service area.
SR blocks were stamped on the block face next o the timing over with SR and a string of numbers. The SR and following digits were stamped at the Pontiac Engine plant. Some dealers in '68 and up, crudely stamped a partial VIN onto the face of such SR blocks... Most didn't. To get an original block/ shortblock/ or long block replaced under warranty required Zone paperwork. Have several longtime collector friends that have full documentation from both the dealer and corresponding Zone of the early dealer replacement of their RA car's original block. Anything short of that, with an SR block... very questionable.
Sourcing a YS or WT block to go into '65-66-67-68-69-70 GTO has been going on since the early 80's. original blocks blew, or were missing from project cars, and there have always been guys taking shortcuts looking for a block, or omelette engine, who aren't very concerned with casting dates, but are somehow really concerned with the correct year application and two letter code. Has never made much sense to me. I've consitently tried to convey when selling specific code blocks that the block correctly dated what the buyer was needing, not what he mistakenly thought "might work". If date range wasn't correct, often! I would not sell or trade that particular part.