I want to double check my required flywheel and clutch requirements with you guys before ordering.

Balancing Question

Here is my situation:
I have a 2000 chevy 350 block (1pc rear seal) GM#10243880
I bought a 383 balanced rotating assembly for it.
Assembly came with 1pc cast crank, reconditioned GM rods, HU pistons, rod/main bearings and a 400 balancer (it has a recess on a portion of the outer diameter). No flywheel or flexplate used in the balancing of the assembly.

I just bought a NIB T56. GM#24502497 skip-shift delete.
This is not the retro T56, so I will have to use the LT1 clutch/hydraulics.

Questions:
What flywheel do I need? Any mfg part numbers for flywheel/clutch package?
Will the stock GM clutch, pp and flywheel work here? GM#12551309, 10207027 and 10125379?
Is part# (GM) 12551309 correct for hydraulics?
Is part# (GM) 12523312 correct for the shift fork?
Is part# (GM) 10085246 correct for the TO bearing?

I searched but is seemed most posts concerning flywheels and T56's were related to 355's with 2 pc seals. Couldn't find one of this iteration.

A couple extra sets of eyes on the requirements/part numbers would be fully appreciated since GM and other mfg's seem particularly proud of the LT1 clutch stuff- prices are mighty high!

As always- your expertise, time and input is appreciated-
S-D

If I'm missing anything or you need additional info, let me know-
Thanks!

 

Stock 1 pc rear engines use regular balancers (internal balance) and a counterweighted flywheel with the smaller 3 inch bolt circle. The reason for this is the counter weight used to be on the end of the crank on the older two piece seal motors and when they switched to the one piece in 86 there was no longer room cause of the round seal surface.

LT1 flywheels are designed with a counter weight on them for 1 pc motors. Your manufacturer may have used a 400 cast crank that has been custom machined for a one peice seal, but that uses the old 400 balance(external) that requires the use of a recessed lip balancer. In this case the stock LT1 flywheel will work.

If they used the 400 balancer to make up for the counterweighted flywheel of late model cranks, then you will need a custon NEUTRAL balance LT1 flywheel for a 1 pc rear crank. Best bet is to take the whole rotating assembly with the balancer and a 1 pc seal flywheel OR flexplate (they have the same balance weight) to a machine shop to see what your balance is, whether your crank+balancer is neutral or still needs the weighted flywheel.

 

Hi Gasgzlr-
Thanks for taking the time to read/respond. Picture below shows the balancer used to balance the assembly. Is this what you refer to as a "recessed lip" balancer?
So it is looking like the stock LT1 clutch would be the way to go?
Thanks for your input-
S-D

 

TTT- Anyone else?

 

Some additional comments are made in this other post of mine:
https://www.thirdgen.org/techbb2/sho...hreadid=231002

After contacting both CenterForce and Competition Products directly, I found the following:
The Center Force DF clutch setup (pn DF039020) will work.
I need to use Center Force Flywheel pn 00177.

This is based on the fact that the balanced 383 1 pc rear seal rotating assembly I bought is made to use a 350 flexplate (with 400 balancer). I cross checked this with 2 guys at CP and got the same answer from both of them, so feel confident it will work. Regardless, I will post results.
Thanks-
S-D