Page 172 of GM Performance Parts 2006 Catalog by GM Parts Direct

NOTE: 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. 3858533 Crankshaft Pulley, 6-5/8" (not shown) Two-groove, high-rpm, 6-5/8" pulley for engines with short water pump. Can be used with water pump pulley P/N 3770245 and belt P/N 9433722 without an idler pulley or alternator. 3815933 Crankshaft Bolt (not shown) Positive retention 7/16-20 x 2-1/4" bolt for engines with tapped crank snouts. Use with washer P/N 14001829. 14001829 Washer (not shown) 1 3/4" x 1/2" x 5/16" thick washer for crankshaft bolt. 12367601 Balancer Timing Tape (not shown) Balancer timing tape for all 8" dampers. 383 Crate Engine Balancer with 1-Piece Crank Seal (P/N 12498008) Racing Balancer (P/N 24502534 and 24502535) 170 SMALL-BLOCK BALANCERS Part Engine Outside Technical Notes Number Application Diameter 12551537 1969-up 305 and 350; 90 V-6 competition 6.75" Smaller size for limited clearance. Timing mark is 10 degrees before keyway centerline. Use with timing pointer P/N 3991435. 3817173 1962-68 302 and 327 8" Cast iron. Inertia ring is 1-11/16" wide; timing mark is 10 degrees before keyway centerline. Do not use pointer P/N 3991436 unless TDC mark is adjusted. 88960604 1970-74 350; ZZ4 crate engine 8" Cast iron. Inertia ring is 1-11/16" wide. Use with timing pointer P/N 3991436. 12498008 383 crate engine with 1-piece crank seal 8" Use with 383 engine components and crankshaft P/N 12489436. 6272225 400 cu in 8" Counterweighted damper for externally balanced crankshaft. Requires flexplate P/N 471578. Timing mark is 10 degrees before keyway centerline. Use with timing pointer P/N 3991436. 364709 All racing 8" Heavy-duty nodular iron. Use with competition engines where a production-style balancer is required. Use with timing pointer P/N 3991436. Refer to Chevy Power manual for damper prep procedure. 24502534 All racing 7.74" NASCAR-approved and specially tuned up to 9000 rpm. Uses standard crank hub diameter. Accepts standard pulleys. 24502535 All racing 7.74" NASCAR-approved and specially tuned. Use with large-diameter 1.598" crankshaft hub. CHEVY SMALL-BLOCK V-8

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