Blueprint Specifications

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



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