[QUOTE=vamman1;6443017]How do you identify the year of a 455 block?[QUOTE/]
Narrowing it down... With the ( as the first character of the engine assembly number, that character was used on all production very late '70 model up into '74 model Pontiac V8's, except on the face of the '73 & 74 455 SD blocks. The YA code was used on '74 model 350's, so the block has to be cast from mid June of 70 through early '73 production.
Exact date cast is confirmed by examining the small alpha-Numeric casting date back by the distributor hole.
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Last edited by 'ol Pinion head; 07-28-2023 at 09:31 AM.
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