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Old 02-15-2007, 10:16 AM
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Measure the wrist pin bore in the pistons, 0.927" is a small block Chevy, 0.912" is a small block Ford, 0.990 is a big block Chevy, etc. If the pin mikes 0.927", then measure from the crown of the piston at the very edge down to the top of the pin bore. A measurement of 1.332" to 1.337" will be a piston for a 3" stroke small block Chevy.

The diameter of the piston could be 3.875" for a stock bore 283 or 3.905" for a 0.030"-over 283 or 3.935" for a 0.060"-over 283 or whatever. For a 302 it would be 4.000", 4.030", 4.060".

Drag out your dial caliper and have at it.
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