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Valarius_Starchaser · 03-31-2016, 01:48 PM

Okay so the difference is 10mm gm part number 12563532 is a spacer that is put between the crank and flywheel but a standard style flywheel to work. Whichever way is cheaper is the best in my mind as they should both work fine and will get the same job done.

I see no reason the manual application would change much other than the use of a flywheel instead of the flexplate. Others may have more info

EDIT: In my catalog the LS3 stock flywheel part number is 12598613 and lists at 271.91

03-31-2016, 01:48 PM	#5
Valarius_Starchaser Registered User Join Date: Sep 2015 Location: Sioux Falls, South Dakota Posts: 702	Re: BBC and LS bellhousing compatibility Okay so the difference is 10mm gm part number 12563532 is a spacer that is put between the crank and flywheel but a standard style flywheel to work. Whichever way is cheaper is the best in my mind as they should both work fine and will get the same job done. I see no reason the manual application would change much other than the use of a flywheel instead of the flexplate. Others may have more info EDIT: In my catalog the LS3 stock flywheel part number is 12598613 and lists at 271.91 __________________ "Orange Crush" Last edited by Valarius_Starchaser; 03-31-2016 at 02:08 PM.