[b-man]

Have you considered going to the one piece BOP seal?

Here’s how Mick (lust4speed) did the seal and crankshaft install on my 421 HO.

After checking the main seal fit in the block with the rear main cap tightened it was determined that it fit the machined receiver groove in the block perfectly with just the right amount of compression.

Main bearings in place ready for the crankshaft install. All main bearing clearances were checked with the proper measuring tools. After shuffling around some of the bearing halves all the clearances ended up between .0023" and .0024" so we're looking good there.

No helpers were present to help install the heavy 80+ pound crankshaft and BOP one-piece main seal at the same time, so an engine hoist was employed to help accomplish this important and somewhat delicate task.