Jst wanted to know the facts and peoples thoughts on the mexican block, as i recently found out my fairlane,got one from the factory. From what i've heard, the last of the windsor xw's were all mexican blocks.
This is what i've found out:
1) Higher nickel content, approx 15%.
2) Thicker webbing around the bores.
3) Beefier main caps.
4) Identifiable by "made in mexico" (written in mexican) in the lifter valley.
5) Identifiable by an untapped stud boss on the front passenger side of the block.
Anything i've missed out or anything that's wrong, please let me know.
Some 302 blocks cast in Mexico have thicker, 289 HP style bearing caps. These were supposedly made with a higher nickel content alloy. Folklore claims these to be beefier than other blocks. On my bathroom scale a 1970 dated Mexican block weighed within 1/2 a pound of a regular 1970 302 block. That must be some lean beef.
Identified by casting numbers C8AM-B, 75ZY-AA, D1ZM-AA, among others, these blocks may be spotted by the "Hecho En Mexico" cast in the lifter valley. An extra unmachined boss protruding from the front of the driver's side cylinder bank can be easily spotted at the junkyard.
"I married Miss Right. I just didn't know her first name was Always."
Late model 5.0 blocks are the weakest of the lot, as those of you who have seen a 5.0 block split clean in half will testify. The weakest part of the windsor blocks is the main webbing and the deck thickness. A mexican is stronger in both these areas.
I switched to mexican blocks years ago after having durability problems the the standard windors. Add roller lifters and it's no contest.
I should point out, it should only be in extreme applications where you will have any block trouble.
I just happen to have a mexican block with Comp Cams XE274HR roller, matching springs, crane roller lifters and pushrods for sale :)
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