Gentlemen, I have to replace my flexpate on my 94 lt1. Motor is completely
stock. Not sure what type of flexplate to use. Also want to replace rear main
seal while I am back there. Does the oil pan have to be removed for the seal?

 

you want to run a weighted flex plate vs a neutral aka "zero" balanced flexplate. There will be a small weight tack welded to the flexplate. Basically a stock replacement flex plate.

no need to remove oil pan to replace rear main seal. I use the rubber felPro seal vs the Teflon one

 

Thanks, so much!

 

for example

TCI 399173: SFI-Approved Flexplate Small Block Chevy LT1 | JEGS

note the welded weight on it. you need "external" balance flexplate