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Hey the machinist might be referring to the "Mexican" block? The 302 (5.0) came in two style of blocks, one was a "Mexican" block, more nickel or something like that. Supposed to be stronger than the USA block.
Could be the same thing applies to the 351? There was some kind of marking or casting difference on the 5.0 block that identified it as Mexican.
Anyone heard about this on the 351's?
Ernie
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