Rear Main Seal

Well the good thing is that my engine builder gecked my block and told me I could save $75.00 as it didn't need line honing, so we should be good there.

Do you know the history of the block? If not, it may have been lined honed before. Personally I line hone everything. There is no reason to start a build with the main line not being perfect. It's also how I set the bearing clearances.