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Chevy Small-Block v-8<br />
Balancers and Pulleys<br />
Balancers are relatively small parts that play a big role in how<br />
smooth an engine runs. Balancers are also known as torsional<br />
dampeners or harmonic balancers, which is indicative of how they<br />
help control unwanted crankshaft vibrations. By controlling vibrations,<br />
GM Performance Parts balancers help engines run smoothly,<br />
which also extends engine life.<br />
Flywheels and Flexplates<br />
At the oppos<strong>it</strong>e end of the crankshaft from the balancer are<br />
flywheels and flexplates, which connect the engine to e<strong>it</strong>her<br />
manual (flywheels) or automatic (flexplates) transmissions. GM<br />
Performance Parts offers both internally and externally balanced<br />
flywheels and flexplates. It is cr<strong>it</strong>ical you use the correct design for<br />
your engine application.<br />
3858533<br />
Crankshaft Pulley, 6-5/8" (not shown)<br />
• Two-groove, high-rpm, 6-5/8" pulley<br />
• For engines w<strong>it</strong>h short water pump<br />
NOTE: Can be used w<strong>it</strong>h a water pump pulley and belt P/N<br />
9433722 w<strong>it</strong>hout an idler pulley or alternator.<br />
3815933<br />
Crankshaft Bolt (not shown)<br />
• Pos<strong>it</strong>ive retention 7/16-20 x 2-1/4" bolt for engines w<strong>it</strong>h<br />
tapped crank snouts<br />
• Use w<strong>it</strong>h washer P/N 14001829<br />
14001829<br />
Washer (not shown)<br />
• 1-3/4" x 1/2" x 5/16" thick washer for crankshaft bolt<br />
383 Crate Engine Balancer w<strong>it</strong>h 1-Piece Crank Seal (P/N 12498008)<br />
Pre-1986 Flywheel<br />
1986-up Flywheel<br />
NOTE: IMPORTANT! All Chevy Small-Block and Big-Block engines<br />
w<strong>it</strong>h one-piece crankshaft seal require an externally balanced<br />
flywheel or flexplate.<br />
Bolts<br />
12337973<br />
Flywheel Bolt (not shown)<br />
• F<strong>it</strong>s all Chevy Small-Block V-8, Big-Block V-8 and 90°<br />
V-6 engines<br />
• Sold individually; 6 required per engine<br />
3727207<br />
Flexplate Bolt (not shown)<br />
• F<strong>it</strong>s all Chevy Small-Block V-8, Big-Block V-8 and 90°<br />
V-6 engines<br />
• Sold individually; 6 required per engine<br />
Chevy small-block v-8<br />
14" Flexplate<br />
12-3/4" Flexplate<br />
small-Block BalancerS<br />
Part Engine outside Technical Notes<br />
Number Application Diameter<br />
Racing Balancer (P/N 24502534 and 24502535)<br />
12551537 1969-up 305 and 350; 90° V-6 <strong>com</strong>pet<strong>it</strong>ion 6.75" Smaller size for lim<strong>it</strong>ed clearance. Timing mark is 10 degrees before keyway centerline. Use w<strong>it</strong>h timing<br />
pointer P/N 3991435<br />
3817173 1962-68 302 and 327 8" Cast-iron. Inertia ring is 1-11/16" wide; timing mark is 2 degrees before keyway centerline. Do not use<br />
pointer P/N 3991436 unless TDC mark is adjusted<br />
88960604 1970-74 350; ZZ4 crate engine 8" Cast-iron. Inertia ring is 1-11/16" wide. Use w<strong>it</strong>h timing pointer P/N 3991436. For external balanced engines.<br />
12498008 383 crate engine w<strong>it</strong>h 1-piece crank seal 8" Use w<strong>it</strong>h 383 engine <strong>com</strong>ponents and crankshaft P/N 12489436. For external balanced engines. Counter<br />
weight can be removed for neutral balance<br />
6272225 400 cu in 8" Counterweighted dampener for externally balanced crankshaft. Requires flexplate P/N 471578. Timing mark is<br />
10 degrees before keyway centerline. Use w<strong>it</strong>h timing pointer P/N 3991436<br />
24502534 All racing 7.074" NASCAR-approved and specially tuned up to 9000 rpm. Uses standard crank hub diameter<br />
Accepts standard pulleys<br />
24502535 All racing 7.074" NASCAR-approved and specially tuned. Use w<strong>it</strong>h large-diameter 1.598" crankshaft hub<br />
Small-Block Flywheels<br />
Part Year of Outside Crank Flange Clutch Starter Ring Technical Notes<br />
Number Engine Diameter Bolt Pattern Diameter Gear Teeth<br />
14085720 1955–1985 12.75" 3.58" 10.4" 153 For two-piece crank seal. Lightweight nodular iron; weighs approximately 15 pounds<br />
3991469 1955–1985 14" 3.58" 10.4"; 11" 168 For two-piece crank seal<br />
14088646 1986–up 12.75" 3.00" 10" 153 For one-piece crank seal. Lightweight nodular iron; weighs approximately 17 pounds<br />
14088650 1986–up 12.75" 3.00" 10.4" 153 Standard-weight flywheel for one-piece crank seal<br />
10105832 1986–up 14" 3.00" 11"; 11.85" 168 For one-piece crank seal<br />
Small-Block Flexplates<br />
Part Year of Outside Crank Flange Converter Starter Ring Technical Notes<br />
Number Engine Diameter Bolt Pattern Bolt Pattern Gear Teeth<br />
471598 1970–1985 14" 3.58" 10.75"; 11.50" 168 For internally balanced engine w<strong>it</strong>h two-piece crank seal<br />
471578 1970–1980 14" 3.58" 10.75"; 11.50" 168 For externally balanced 400-cu-in engine only. Use w<strong>it</strong>h balancer P/N 6272225.<br />
471529 1969–1985 12.75" 3.58" 9.75"; 10.75" 153 For internally balanced engine w<strong>it</strong>h two-piece crank seal<br />
14088765 1986–up 12.75" 3.00" 10.75" 153 For externally balanced one-piece crank seal<br />
12554824 1986–up 14" 3.00" 11.50" 168 Heavy-duty flexplate w<strong>it</strong>h increased thickness for one-piece crank seal, externally balanced<br />
14088761 1986–up 14" 3.00" 10.75"; 11.50" 168 For one-piece crank seal, externally balanced<br />
174 Buy online at www.gmperformanceparts.<strong>com</strong><br />
Available for purchase online at<br />
gmperformanceparts.<strong>com</strong><br />
175
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