[SStockDart]

The Mexican block can be identified by, for example, C8AM stamped on the block (unlike the C8OE or C8AE). The M in the # is for the Mexican block. They have a higher nickle content for strength and wider main bearing caps. Buying a Ford racing block might be a better option. They are available for under $300 if you can't find the mexican block. They are fairly rare.

easy Id on a mexican block is the two large humps cast into the block, right below the heads. They only had a higher nickel content.

Many have the belief that Mexican means something sub-standard to US standards....that is not the case...These blocks meet the standards of Ford Motor Company or they would not use them....it is that simple.