ok i got a 85 TA with an lg4 and a 5 speed. im taking the engine out and replacing it with a 350 from my 79 Maro. the 85 5.0 looks like a 1 piece seal, but shouldnt it be a 2 piece? are all lg4's 2 piece main seal? the flywheel from th 5.0 is a 153 tooth and wont fit the 350 which had a 168 tooth flexplate. whats up with my engines/trannys?

 

all 85 and before SBC are 2 piece

all 86 and after SBC are 1 piece, including the LG4

 

153 or 168 tooth isn't the issue with regard to bolting it to the crankshaft. Rear main seal type is. Tranny isn't affected either way.

Like Guy said, '85-earlier should have been two-piece. It's possible the engine was replaced at some point with a later style (under warranty, for instance).

Are you sure it's a 305? I'd check the casting # if I were you.

 

My 92 SBC crate motor has a 2 piece rear main

 

Crate motors don't count, because even a new crate engine can be for the older applications. The low-end Goodwrench 350 crate, for instance, is two-piece for '85-older applications (just like it says in the brochure).

 

Checked the numbers found out that the 85 really was a 85 with a 2 piece and that the engine out of my 79 had been replaced with an 86 350 at some point which is what confused me, thanks for the help.