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Small pilot is 1.375, and large is 1.848.

Both sizes are possible in different years, but theoretically, '71 and up have a 1.375 pilot deep in the crank flange, and pre '71 have the 1.848 shallow pilot size.

Check out the 429/460 forum, they've been discussing this there. http://network54.com/forum/85220

Good luck!

Greg
 
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