Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - 350 vs 400 pontiac engine ID
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Old 05-22-2013, 07:33 PM
h0trod h0trod is offline
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good luck trying to ID the block, i havnt had much luck with mine.
the most for sure way to find out is by pulling the heads and measuring the bore. however, there is only .005" between a 400 and a 455. there are numbers on the passenger bank on the front face and the rear casting below the head.

mabe youll get lucky!

you can also look under the #1 exhaust port for a cubic inch casting.
if it says 350 or 400, it would be a post 73 block(i know in the 70's they started stamping them, just cant remember what year)
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