403 Oldsmobile engine
#5
#6
There also would be a big 403 cast in the side of the block and possibly a X, if a 403. Let me guess, a big 8 on the heads by the number 1 and 8 spark plug. Betting it is a 73 to 76 350, a very good motor.
#8
There were about 750 330 motors built at the very end of the 1967 model year that used 1968 350 block castings with smaller bores. This is documented in Dealer Technical Bulletin 67-T-19. I don't know if this might be one of those blocks or not. If this really is from the 1967 model year, it won't have a VIN derivative stamp on the block. These late 67 330s could have come with #4 heads or #5 heads. The DTB shows both as options.
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