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Old 07-09-2010, 07:13 AM
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There is no 400M.

The 335 Engine Series is comprised of the 351C/351M and 400.

C (Cleveland) and/or M (Modified) differentiate the 351 CI displacement engines, the C being low deck and the M high deck (same as 400 block).

The 351C was discontinued in 1974 and the 351M was introduced in 1975 so as both engines (351M/400) could use one block.