Page 173 of GM Performance Parts 2006 Catalog by GM Parts Direct

171 NOTE: FLYWHEELS FLEXPLATES Find the right part to match your engine from the easy-to-follow guides below. Select flywheels for manual transmission vehicles and flexplates for automatic transmission vehicles. IMPORTANT! All Chevy small-block and big-block engines with one-piece crankshaft seal require an externally balanced flywheel or flexplate. BOLTS 12337973 Flywheel bolt Fits all Chevy small-block V-8, big-block V-8 and 90 V-6 engines. Sold individually; six required per engine. 3727207 Flexplate bolt Fits all Chevy small-block V-8, big-block V-8 and 90 V-6 engines. Sold individually; six required per engine. SMALL-BLOCK FLYWHEELS Part Year of Outside Crank Flange Clutch Starter Ring Technical Notes Number Engine Diameter Bolt Pattern Diameter Gear Teeth 14085720 1955-85 12.75" 3.58" 10.4" 153 For two-piece crank seal. Lightweight nodular iron; weighs approximately 15 pounds. 14088646 1986-up 12.75" 3.00" 10" 153 For one-piece crank seal. Lightweight nodular iron; weighs approximately 17 pounds. 14088650 1986-up 12.75" 3.00" 10.4" 153 Standard-weight flywheel for one-piece crank seal. 3991469 1955-85 14" 3.58" 10.4"; 11" 168 For two-piece crank seal. 10105832 1986-up 14" 3.00" 11"; 11.85" 168 For one-piece crank seal. SMALL-BLOCK FLEXPLATES Part Year of Outside Crank Flange Converter Starter Ring Technical Notes Number Engine Diameter Bolt Pattern Bolt Pattern Gear Teeth 471598 1970-85 14" 3.58" 10.75"; 11.50" 168 For internally balanced engine with two-piece crank seal. 471578 1970-80 14" 3.58" 10.75"; 11.50" 168 For externally balanced 400-cu-in engine only. Use with balancer P/N 6272225. 471529 1969-85 12.75" 3.58" 9.75"; 10.75" 153 For internally balanced engine with two-piece crank seal. 14088765 1986-up 12.75" 3.00" 10.75" 153 For one-piece crank seal. 12554824 1986-up 14" 3.00" 11.50" 168 Heavy-duty flexplate with increased thickness for one-piece crank seal. 14088761 1986-up 14" 3.00" 10.75"; 11.50" 168 For one-piece crank seal. 12-3/4" Flexplate Pre- 86 Flywheel 86-up Flywheel 14" Flexplate

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