I know that with my LT1 bellhousing ill have to have a special 153 flywheel for my external balanced old two-piece 400 but im having the hardest time trying to find one. anyone know what im talking about?

 

Spec, Hays ,McLeod, centerforce
all have retrofit t56 flywheels

 

Last time I did that I think the part # was a Centerforce 700170. Not sure whether they still make it, it's been 20 years or more.

The regular 350 one (700107 if memory serves) has plenty of meat to drill out balance holes. Not that hard for even a shadetree to do.

 

both of those PNs are one piece flywheels haha thanks tho. i recon im gonna have to call one or 4 of those companies cuz its hard to ask the Summit filter exactly what I need sometimes yah know lol

 

Not that hard to call suppliers to ask part numbers or search
spec has this in external balance Spec sc66-400
https://specclutch.com/conversion_combos/view/2

centerforce 700173

 

I got mine from American Powertrain. Was years ago though.

 

I guess I forgot that my memory isn't what it used to be.

700173 for one already set up for 400; 700107 for all other SBC, and BBC besides 454, according to their 2003 catalog