Flex plate ? going from a c6 to a PG

My buddy is selling his motor to another friend who's t bird uses a power glide , my ? is the 460 I built is ext balance using a ext balance scat flex plate , what will he need for the glide flex plate ? I guess I mean will he have to get the glide flex plate balanced to the 460 ?

Most of the aftermarket flex plates are drilled for both Ford and GM patterns.  If it isn't, I'd just get a new one that is.  They are fairly inexpensive.  I have had a TCI that was drilled that way, and 2 JW's that are.

That external balance may be a problem. You may be able to drill the glide pattern on it? You can also have a converter made to fit your flexplate.

my CSR has both patterns but it is internal balanced they may also have one for external balance

If the flywheel has the counter weight on it still,why couldn't you just drill the PG pattern on it?

I have to see what kind of flexplate he has in there now and if the 460 that came with the Tbird is external or internal balance, the car already had a 460 in it before but it dropped a couple valves and tore up the iron head , its the one I showed pictures of a while ago and asked if it could be fixed, and if his is internal than we will drill the flexplate. I don't recall the scat having both patterns but I could be wrong.

Some of those dual bolt patterns are glide & turbo 400.

dfree383 wrote:Part number for JW wheel is N930001-X and the convertor bushing is 80002-1

To many "zeros" Dave... N93001-X is the flywheel/flexplate for a Turbo/Powerglide to external balance 460..

That flexplate has BOTH the small and large GM torque converter bolt patterns.