[BRENT in 10-uh-C]

Originally Posted by tinkirk

Just wondering about insert bearings on the mains.
1) Will they hold up without putting system under pressure?

2) and if so what might be the best ones out there?

3) also what is the best thing to do about a rear main seal

1) Yes.

2) The ones that Antique Engine Rebuilding manufactures.

3) The "best thing" is likely to receive an opinionated answer, however please know that if the rear main journal pin to bearing clearance is within correct specification, there won't be any leakage providing the drain tube is properly installed.