ok i am wantong to put a t-56 into my car. the motor is pre 87 block which means it has a 2 piece rear main. what is the LT1 flywheel, external balanced or internal, 153 tooth right? which do need? in theory couldnt i just go down to Hi-Lo and buy a flywheel for my car with 153 tooth and either external or internal balance?

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Brandon
"ScreaminDeamin 360"
350 60 over, TRW forged 9.83:1 pistons,Hooker Comp headers, crane cam 216/228 .484/.512, crane 1.6 RR's, ported plenum, home made ram air, 19 lb SVO injectors, crane AFPR, all going through 3 inch mandrel pipe and a flowmaster.
New project-89 IROC
http://users.argolink.net/bvana
http://ScreaminDeamin.cz28.com

 

anybody?

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Brandon
"ScreaminDeamin 360"
350 60 over, TRW forged 9.83:1 pistons,Hooker Comp headers, crane cam 216/228 .484/.512, crane 1.6 RR's, ported plenum, home made ram air, 19 lb SVO injectors, crane AFPR, all going through 3 inch mandrel pipe and a flowmaster.
New project-89 IROC
http://users.argolink.net/bvana
http://ScreaminDeamin.cz28.com

 

A fourth gen flywheel will not work on a two piece rear main seal. You do have to have a LT1 specific flywheel for the pressure plate and clutch to work properly. You will have to buy a custom flywheel from Centerforce, McLoed, or maybe Hayes. I bought a Centerforce flywheel for $300. Ouch. Anyway, I think your tooth count is correct and a 350 is internally balanced so you should buy a nuetral balance flywheel. I had to buy an externally balance flywheel for my 383 since it uses a 400 crank. Good Luck.

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1992 Camaro Z28; Engine:383 w/Edelbrock RPM ported heads. Lunati Solid Roller Cam 224/232 .502/.502, Fluidampr, 1.5 Roller rockers, 30 lb injectors. Haltech E6GM DFI, SLP 1 3/4" headers, 4" Mufflex, T56, 4.10. Super Ram.

Mo steel for Mo stremph!

 

Yeah. There are basically 4 versions of the chevy flywheel.

153 tooth, 12 3/4", neutral balance, with a 3.58" crank bolt pattern - Fits and balances most pre86 (two piece rear) SBCs except for 400s

168 tooth, 14", neutral balance, with a 3.58" crank bolt pattern - Fits and balances most pre86 (two piece rear) SBCs except for 400s

Above are true for 400s except it is counter balanced because the larger crank's counterweights can't fit in the block.

153 tooth, 12 3/4", counter balance, with a 3" crank bolt pattern - Fits and balances post87 (1 piece rear) most SBCs.

168 tooth, 14", counter balance, with a 3" crank bolt pattern - Fits and balances post87 (1 piece rear) most SBCs.

Which gives us this chart

153 12.75 3.58 N (Most exc. 400)
168 14.00 3.58 N (Most exc. 400)
153 12.75 3.58 C (400 CI)
168 14.00 3.58 C (400 CI)
153 12.75 3.00 C (Most after 87)
168 14.00 3.00 C (Most after 87)



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1984 WS6 Trans Am Hartop
Former L69 Car under restoration
1984 Trans Am T-tops
4-bolt main 350, performer intake, headers, Holley 650, T-5, hayes clutch, dual elec. fans and 3.23's.
Daily driver and restoration
13.98 @ 101