wear are the casting numbers on the 455 heads located and what is the differance in the numbers from the heads with the 1.6"intake valves and the heads with the 2.11"intake valves.

Asked by Aug 30, 2012 at 01:31 PM about the Pontiac Le Mans

Question type: General

1 Answer

3,175

casting numbers are on the rear of the engine where the tranny mates up. check yearone gto calalog for all engine and heads ID numbers, there are also more sites with ID numbers on the web. 2.11 heads are larger valves. the head ID is the numbers on the center exhaust ports.

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