I have an 87' GTA that was originally a 305 tpi 5spd and im replacing the 305 with a 350. I was wondering if anyone might know of a website where i can get a flywheel for the 350 engine that is the same size as the factory 305 flywheel. Ive been told by a few people that the center hole on the flywheel for a 305 is 2 1/4'' where as the 350 is 2 1/2''. Im pretty sure the diameter of the factory flywheel is 10 1/2''. I purchased a clutch and flywheel for the car that was 11'' in diameter and that was too large to fit inside the bellhousing. Any help would be greatly appreciated.

 

What you need to know is the type of rear main seal for the 350. If '85-earlier vintage, it's 2-piece rear main seal. If '86-later, it's 1-piece (like your 305).

The other thing you need to know is "153-tooth". If your 350 is '85-earlier, the '83-'85 V8 f-body application is the 2-piece rear main seal flywheel; so if you ask/search for that, you'll be getting the right thing.

305 or 350 doesn't matter. Only the rear main seal type, and "153-tooth".

www.summitracing.com will have what you need regardless.