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Bore and Ring Tolerance Specs

13K views 5 replies 2 participants last post by  Pikachu 
#1 ·
Ok. I just spent an hour and a half searching this site and others for cylinder diameter specs and ring gap specs for a stock bore 7.3. Is this info posted somewhere? The bores are clean (not gouged) and the crosshatch is almost gone mid cylinder on all cylinders. Going to pull pistons to check rings for gap once I can get specs. Thanks in advance!!
 
#2 ·
Here's what's in the workshop manual.

Cylinder bores - 4.1096 - 4.1103
Max out of round and/or taper: 0.0005

Ring end gap -
Top compression: 0.014 - 0.024
Second compression: 0.062 - 0.072
Oil control: 0.012 - 0.024
 
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#4 ·
Piston skirt diameter: 4.10475" +/- 0.00025, measured 90 degrees to the pin, 1.684" below the oil ring groove, at room temperature.
Piston wrist pin bore: 1.3085 - 1.3088"
Piston protrusion above deck: 0.010 - 0.031"
 
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