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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 |
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
Engine Blueprinting by Rick Voegelin - This book is a step-by-step guide to engine blueprinting. The book covers every component in the engine, assembly tips, performance modifications, and the tools needed to do the job right. I recommend this book to anyone trying to build a high-performance engine and wants it to stay together. I also recommend this book to anyone trying to extract every ounce of horsepower from a rebuild. I personally have built numerous engines and still learned quite a bit from reading this book. Click on the book cover for more info.
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