| Measurement |
Tolerance |
| Mains |
0.002-0.0025
0.003 max.
|
| Crank Run Out |
0.004 max. |
| Crank End Play |
0.004-0.008 (best)
0.012 max.
|
| Rods |
0.002-0.0025 (stock)
0.0025-0.003 (performance)
|
| Rod Side Clearance |
0.014-0.024 |
| Piston Clearance |
0.0025-0.003 (stock cast)
0.004-0.0045 (performance)
0.005-0.008 (race)
|
| Piston Ring Gap |
0.017 (street - rings #1 & #2)
0.015 (performance - ring #1)
0.012 (performance - ring #2)
|
| Piston Ring to Groove Clearance |
0.002-0.004 (street)
0.001-0.002 (performance)
|
| Cylinder Wall Finish |
Moly Rings - 400 grit stones or 400-600 grit wet/dry paper around stones (short break-in - excellent performance rings)
Chrome Rings - 280 grit stones (extremely hard rings - resistant to dirt - long break-in)
|
| Quench Clearance
(deck height + gasket thickness)
|
0.038 min.
0.040-0.045 best
0.060 max.
|
| Camshaft End Play |
0.001-0.007 |
| Torque Specifications (all readings in ft. lbs.) |
Cylinder Head Bolts: 65-72
Rod Bearing Bolts: 19-24
Main Bearing Bolts: 60-70
Crankshaft Balancer Bolt: 70-90
Flywheel-to-Crankshaft Bolts: 75-85
Intake Manifold: 19-27
|
*Consult piston manufacturer for hypereutectic pistons
Sources:
Chilton’s Manual
Shelby American Guide
Fordmuscle.com Webzine
Rebuilding Small Block Fords by Monroe
Ford Performance by Pat Ganahl
Smokey Yunick’s Power Secrets