flywheel internally balanced?

[Mr. Goodwrench 707]

i have a 95 z28....it says i have a 1pc rear main which is correct...so why do they offer you and externally balanced flywheel with 2 pc rear main

[95formula383lt1]

i have a 2pc rear main crank in my 383 lt1 an use a 2pc rear main flywheel bolt pattern is diff. Its a centerforce its made so you can put a 6 speed in a older pre 87 sbc or big block. i think you posted this in the wrong section though.

[Mr. Goodwrench 707]

where should i have posted this? im newer to this website....and so i have a stock lt1 block 87 + newer are 1 pc rear main i hear...so i would need the internally balanced flywheel correct?

[chevymec]

Usually an externally balanced sbc is a 400 or has 400 sbc componets.