Does anyone know what the 2 black pieces that came with my seal are for? And does the thicker inner part of the seal face toward the inner part of the motor?
It's a superformance seal kit from Hughes- but no instructions!
The 2 black rubber pieces are for sealing the main cap to block surface. They are installed into the grooves on the main cap on "Pre Magnum" LA Series blocks. There is also a left and a right, the main cap seals are NOT identical and therefore one is marked with white ink.
As for the orientation of the shaft seal. As with any other rear main seal be it Ferd, Chebby or Mercedes the thicker "Primary Seal Lip" always goes toward the oil side of the motor.
In your picture the right side is the oil side and the left is air side. The thin seal lip is a dirt exclusion lip.
Lubricate the seal well with engine assembly lube. You can offset the seal a 1/8" or so to help with alignment of the two seal halves. Do Not excessively offset the seal. Do Not use any sealers on the rear main seal itself!!!
You can always contact the Manufacturer for expert advise if you have questions on installation. They have a website with email, a facebook page, a Toll Free number and are more than happy to help with your questions