Page 131 of 2009 Performance Parts by GM Parts Direct

chevy big-block v-8 crankshafts crankshafts are a critical central component of any engine strength and durability are important traits of a great crankshaft gm performance parts crankshafts are precision-engineered to be both strong and durable gm performance parts understands how catastrophic crankshaft failure can be so that s why its crankshafts are manufactured to such exacting specifications and tested to withstand the forces of high-performance engines these crankshafts are the same tough parts used in gm performance parts crate engines balancers and pulleys balancers are relatively small parts that play a big role in helping engines run smoothly balancers are also known as torsional dampeners or harmonic balancers which is indicative of how they help control unwanted crankshaft vibrations by controlling vibrations gm performance parts balancers help engines run smoothly which also extends engine life chevy big-block v-8 14096987 flywheel see chart below 12561217 flexplate see chart below pulleys 3899660 crankshaft pulley 6 not shown 3963524 crankshaft forged steel 454 and mark iv 502-cubic-inches not shown big-block balancers part number 3879623 10216339 engine application originallyusedon1967-1969427 zz427andanniversaryedition427 454and502with4.00 strokecrank 572 outside diameter 8 8 8 technical notes canbeusedonallengineswith internallybalancedcrank.use withtimingpointerp/n3991436 counterweightedforexternally balancedengines.usechrome timingpointerp/n3991436 thisinternalbalancedampeneris designedwithinnerandoutershells itutilizesmatchedo-ringsto controldestructivecrankshaftvibra tions.blackzincchromatefinish laserengraved360°timingmarks · premiumquality · externallybalanced · nitride-treated5140forgedsteelwith4.00 stroke cross-drilled2.75 diameter main journals and 2.20 diameter rod bearing journals · usedon1965 -1990454and502withtwo-piecerearseal note must be used with counterweighted torsional dampener and flywheel or flexplate · twogroove · cast-iron · highrpm,power-savingcrankshaftpulley balancers c 88962814 balancer a crankshaft forged steel gen v and gen vi 502 14096983 crankshaft forged steel gen v and gen vi 454 not shown · externallybalanced · forged1053steelcrankshaftwithone-piecerearmainseal 88962814 · internalbalancedampener,designedwithinnerandouter shells · matchedo-ringstocontrolcrankshaftvibration · blackzincchromatefinish · laserengraved360°timingmarks balancer bolts and washers 9419218 crankshaft bolt not shown a 10183723 crankshaft forged steel gen v and gen vi 502 · externallybalanced · cross-drilled · nitride-treatedforged1053steelcrankshaftwithonepiece rear main seal · forgingp/n14097044 big-block flywheels part number 14085720 3963537 3991469 3993827 14096987 year of outside crank flange engine diameter bolt pattern 1965-1989 12.75 1979-1990 12.75 1965-1969 14 1970-1990 14 1991-up 14 14 3.58 3.58 3.58 3.58 3.58 3.58 clutch diameter 10.4 10.4 11 11 11 11.5 starter ring gear teeth 153 153 168 168 168 168 technical notes lightweightnodular iron;weighs approximately15lbs forinternally balancedengines lightweightnodular iron.counterweighted forexternally balanced454engines usewithbalancer p/n3963530 usewithinternally balancedengines andbalancer p/n3879623 counterweightedfor externallybalanced markiv454engines usewithbalancer p/n3963530 lightweightnodular iron.forexternal balancedengines usedwith572crate engine.internally balanced · positiveretention1/2-20x1-1/2 bolt · forengineswithtappedcranksnout · usewithwasherp/n3864814 3864814 washer crankshaft bolt not shown · 2.06 odx0.52 idx0.28 thick washer · forcrankshaftbolt 19171620 crankshaft forged steel gen v and gen vi 427 not shown flywheels and flexplates attheoppositeendofthecrankshaftfromthebalancerareflywheels andflexplates,whichconnecttheenginetoeithermanualflywheels orautomaticflexplatestransmissions.gmperformancepartsoffers bothinternallyandexternallybalancedflywheelsandflexplates.it is critical that you use the correct design for your specific engine application.engineswithone-piececrankshaftsealsrequireexternally balancedflywheelsorflexplatesexceptforzz427 ,zz572/620 zz572/720randtheanniversaryedition427 checktheaccompanying charts to find the correct parts for specific engine applications note important all chevy small-block and big-block engines with one-piece crankshaft seal require an externally balanced flywheel or flexplate · steelcrankshaftwith3.75 stroke for 1991-and-later 427-cubic-inchengines · one-piecerearmainseal · requireschamferedconnectingrodsp/n19211226or 88962926androdbearingsp/n88961556 · usedinzz427andanniversaryedition427engines · internallybalanced b 88961554 crankshaft forged steel 572-cubic es · · · · b crankshaft forged steel 572 internallybalanced premium4340steelforgingfor572-cubic-inchengines useneutralbalancedampenerandflexplateorflywheel one-piecerearseal bolts and dowels 12337973 flywheel bolt not shown note must use main bearing p/n 88962212 and rod bearing p/n 88962926 14061685 roller pilot bearing not shown 12582964 1991-up · usedinhigh-performancemanualtransmissionapplications big-block flexplates part number year of outside crank flange convertor starter ring engine diameter bolt pattern bolt pattern gear teeth 14 14 14 14 3.58 3.58 3.58 3.58 10.4 11.75 11.75 11.5 168 168 168 168 technical notes usewithforged steelcrank.has dual-boltpattern onlythreeattaching boltsusedwith4l80 transmission usewith572/620 engineandcrank p/n88961554.for internallybalanced engines forinternally balancedengines forexternally balancedengines · fitsallchevysmall-blockv-8,big-blockv-8and90° v-6 engines · soldindividually;6requiredperengine 10046031 flywheel dowel big-block not shown c balancer 10185034 1991-up 12561217 1991-up 471597 1965-1969 14001992 1970-1990 · highlyrecommendedforallhigh-performanceand competition big-block engines 1453658 bellhousing dowel clutch housing/transmission dowel big-block not shown · usewithbig-blockengine · soldindividually;2requiredperengine 3727207 flexplate bolt not shown · fitsallchevysmall-blockv-8,big-blockv-8and90° v-6 engines · soldindividually;6requiredperengine 258 buy online at www.gmperformanceparts.com available for purchase online at gmperformanceparts.com 259

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