Page 226 of GM Performance Parts 2006 Catalog by GM Parts Direct

NOTE: 224 BIG-BLOCK BALANCERS Part Engine Outside Technical Notes Number Application Diameter 3879623 Originally used on 1967-1969 427 8" Can be used on all engines with internally balanced crank. Use with timing pointer P/N 3991436. 10216339 454 and 502 with 4.00"-stroke crank 8" Counterweighted for externally balanced engines. Use chrome timing pointer P/N 3991436. 88962814 572 8" SFI-approved. CHEVY BIG-BLOCK V-8 BIG-BLOCK FLEXPLATES Part Year of Outside Crank Flange Convertor Starter Ring Technical Notes Number Engine Diameter Bolt Pattern Bolt Pattern Gear Teeth 10185034 1991-up 14" 3.58" 10.4" 168 Use with forged steel crank. Has dual-bolt pattern. Only three attaching bolts used with 4L80 transmission. 12561217 1991-up 14" 3.58" 11.75" 168 Use with 572/620 engine and crank P/N 88961554. 471597 1965-69 14" 3.58" 11.75" 168 For internally balanced engines. 14001992 1970-90 14" 3.58" 11.5" 168 For externally balanced engines. BIG-BLOCK FLYWHEELS Part Year of Outside Crank Flange Convertor Starter Ring Technical Notes Number Engine Diameter Bolt Pattern Bolt Pattern Gear Teeth 14085720 1965-89 12.75" 3.58" 10.4" 153 Lightweight nodular iron; weighs approximately 15 pounds. For internally balanced engines. 3963537 1979-90 12.75" 3.58" 10.4" 153 Lightweight nodular iron. Counterweighted for externally balanced 454 engines. Use with balancer P/N 3963530. 3991469 1965-69 14" 3.58" 11" 168 Use with internally balanced engines and balancer P/N 3879623. 3993827 1970-90 14" 3.58" 11" 168 Counterweighted for externally balanced Mark IV 454 engines. Use with balancer P/N 3963530. 14096987 1991-up 14" 3.58" 11" 168 Lightweight nodular iron. For external balanced engines. 12555135 1991-up 14" 3.58" 11.5" 168 Used with 572 crate engine. BALANCERS PULLEYS A smooth running engine depends on an effective balancer or torsional damper. A GM Performance Parts damper not only helps your engine run smoothly, it can extend the life of the engine. Pulleys 3899660 Crankshaft Pulley, 6" Two groove, cast iron, high rpm, power-saving crankshaft pulley. Balancer Bolts Washers 9419218 Crankshaft Bolt Positive retention 1/2-20 x 1 1/2" bolt for engines with tapped crank snout. Use with washer P/N 3864814. 3864814 Washer (Crankshaft Bolt) 2.06" OD x 0.52" ID x 0.28" thick washer for crankshaft bolt. 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 Dowels 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. 3701679 Flywheel dowel (big-block) Highly recommended for all high-performance and competition big-block engines. 1453658 Bellhousing dowel, clutch housing/transmission dowel (big-block) Use with big-block engine. Sold individually; two 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.

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