4. In the previous shot you can see Brent had installed one half of the main bearings. These are Federal Mogul main bearings, 0.010/0.010. When setting bearing clearances, Brent aims for 0.001-inch of clearance for every inch of journal diameter. So, on a 2.750-inch main, he’ll usually be around 0.0027-0.003-inch for the mains. He also likes a little more clearance on the rear bearing as it has a lot more surface area. He’s usually at around 0.0033-0.0034-inch on the rear main. Rod bearings end up at around 0.0020-0.0025-inch.
Brent notes, “When installing the rear seal make sure the lip goes towards the front. There’s a lot to look at when installing a rear main seal. I’ve noticed recently that a lot of the seal halves are sometimes longer than what they need to be, so that when you put the seal half down in the block, or down in the cap, the ends stick up higher than what they should. This needs to be ‘eyeballed’ or else a prominent seal half can crush too much and cause a leak.”