Measurement would be 3.380 If you have one please P.M. me
I have two(2)NOS .0025. Close enough?
Wife pointed out that I got an extra 3 in that measurement should read 3.800
What you are really looking for would be 3.755"
Thanks for the education Frank I was confused everyone else please disregard this post big difference between .005 and .050 the bores are 3.800
Warren, Look at/measure your .0025” pistons to make sure they are oversize and not undersize! There are .0025” undersize pistons too! They would be marked -.0025 and have the Ford script. They were one of the non-standard parts installed at the factory to make up for manufacturing variances. I’ve seen them on more than one occasion, so must have been somewhat common.
Mark, 0025 OS