Small-Block Chevy Spec Chart The accompanying chart lists both recommended clearances and torque specs for a small-block Chevy. The ranges for some clearances are slightly wider since we are not blueprinting this engine. Factory specs list much tighter acceptable bearing clearances, but we prefer ours. Torque specs were taken from a '60s Chevrolet service manual and may be different for your engine based on the specific components used. This is especially true for aftermarket rod bolts. COMPONENT CLEARANCE (INCHES) Main bearing 0.002-0.0030 Rod bearing 0.002-0.0030 Connecting rod side 0.009-or more Crankshaft endplay 0.005-0.010 Retainer to seal 0.050 minimum Valvespring coil bind 0.050 minimum FASTENER TORQUE SPEC (LB-FT) Main cap 80 Connecting rod 45 (3/8-inch bolt) Oil pump 65 Cylinder head 65 Camshaft sprocket 20 Harmonic balancer 60 Chevrolet's published main bearing clearance range for a '66 283 is an amazing 0.0003 to 0.0034 inch. PARTS LIST DESCRIPTION PN SOURCE PRICE Long-block NA Friend $100.00 Summit main bearings 173000 Summit Racing 12.95 Summit rod bearings 172000 Summit Racing 12.95 Summit piston rings, 4.00 133-139-00 Summit Racing 25.95 Fel-Pro gasket set, 1 piece rear main KS-2666 Summit Racing 99.95 Summit valvespring kit 174001 Summit Racing 63.95 Summit oil pump 121155SV Summit Racing 16.95 Melling oil pump pickup 55-S1 Summit Racing 6.95 Summit intake manifold PC22001 Summit Racing 99.50 Lunati cam and lifter package 10000LK Summit Racing 89.95 Summit carb cleaner, four cans SP1503 Summit Racing 23.80 Summit Chevy orange paint SP1005 Summit Racing 5.95 Brass freeze plug kit G1581 Summit Racing 13.95 Summit nonroller timing set G6501 Summit Racing 13.95 Summit assembly lube LUBE Summit Racing 1.95 Summit spark plug wires 868836 Summit Racing 29.95 Autolite spark plugs FRM-25 Summit Racing 12.00 GM HEI distributor Used Swap meet 5.00 Engine oil 10W-30 Local auto parts 10.00 Oil filter, Wix 51069 Local auto parts 6.75 TOTAL $652.40 GMPP rail-style 1.5 rocker arms 12495490 Summit Racing 59.95 How-to References Measuring bearing clearance: carcraft.com/techarticles/ccrp_0805_high_performance_engines_bearing_clearance/index.html How to measure rod bolt stretch: carcraft.com/techarticles/116_0609_using_rod_bolt_stretch_tool/index.html Plastigauge vs. micrometer: carcraft.com/techfaq/116_0701_plastigage_vs_micrometer/index.html How to degree a camshaft: carcraft.com/howto/116_0701_how_to_degree_a_camshaft/index.html How to set valve lash: carcraft.com/howto/ccrp_0702_camshaft/index.html How to start a new engine: carcraft.com/howto/ccrp_0903_how_to_start_a_new_engine/index.html SOURCES Lunati 11126 Willow Ridge Drive Olive Branch MS 38654 662-892-1500 www.lunatipower.com Autolite 39 Old Ridgebury Road Danbury CT 06810 800-890-2075 www.autolite.com Summit Racing 800-230-3030 www.summitracing.com GM Performance Parts P.O. Box 33170 Detroit MI 48232 800-577-6888 www.gmperformanceparts.com « | 1 | 2 | 3 | 4 | View Full Article By Jeff Smith Enjoyed this Post? Subscribe to our RSS Feed, or use your favorite social media to recommend us to friends and colleagues!