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Ford 335 engine
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===Block-cracking problems=== The 400 V8s for the model years 1971β72 were either cast in the Dearborn Iron Foundry or the Cleveland Foundry. Those built for model years 1973β79 were either cast in the Cleveland Foundry or the Michigan Casting Center.<ref name="Bubba"/> The 351M introduced in 1975 shared the same block as the 400. The 351M and 400 blocks cast at the Michigan Casting Center prior to March 2, 1977, experienced water jacket cracking problems above the lifter bores. The cracking was (potentially) caused by an internal coring problem when the blocks were cast, although others considered it to be normal freeze cracking. The result was horizontal cracks approximately 1" above the lifter bore.<ref name="Build"/> After March 2, 1977, the blocks cast at Michigan Casting Center did not have problems with cracking.
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