Quote:
Originally Posted by 68greengoat
I have some numbers. To recap, I have a '73 Pontiac 455 that I'm trying to find what car the motor was originally installed.
Block casting # - 985428
2 digit letter code - YC
Hopefully this will help. Thanks...........
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The casting number 485428 is for a 1973 455, the letter code YC shows it was a 4 bbl, 250 hp engine used with an automatic transmission.
In 1973 Pontiac shows over 70 engine letter codes, they show 25 of those were used on the Lemans and GTO, the letter code YC is listed as one of the codes used on a GTO.
Hope this helps,
