What he said.... leave one side sticking out of the block the block a few centimeters so the seals dont meet at the same place the block and oil pan meet. This way is just asking for trouble eventually.

I've had that with several brands where the seal has a nick in it out of the box. That would really suck to have on a rear main seal.

I have off set the seal contact point many many times never had one leak I slide one side a 1/4 inch into the block and hang the same amount out of the cap and slip them together. Never had a leak.

You've never installed one in the vehicle then. Only difference there is this was upside down on a stand.

Gm decided to install the 2 piece seals on truck engines after 86 but I’m not sure when they switched over

@@chickenfoundation9323 1986 was the first year for 1 piece rear main seals actually. 1985 and previous was 2 piece.

Seal was backordered or something, I don't recall. That would be the usual way to do it.

I've tried without rtv with or without big offset like that. This small offset with very small dab of rtv is what I found to work the best for me. I've never had one leak this way except one that had a weird defect on it. The silicone had a spot that was missing like a air pocket was there in the manufacturing process or something. Had that on a Ford 9in axle seal once too, Strange... Anyway, I can't say the same for the other times I installed the rear main seal differently. Seems it always leaks to some extent.

It's for distributor shaft on oil pump

@@davidrowland2354 Hah Hah ! You're Funny. The O - Ring I'm talking about is about 2" in diameter.

Yes, but it's a challenge.

Groove towards the inside of the block?

I have never found a Chevy engine rear main seal from the factory that was installed in the off set position, And I put them back like they came out and never had a problem!