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One of the design elements Pontiac enthusiasts must address is the rear main seal. The factory motors shipped with rope seals, and while they worked just fine from Pontiac, enthusiasts have never been truly happy with them. Luckily, B.O.P. Engineering (920-674-2522) has developed a new rear main seal that cures these ills. Manufactured from Viton, it is an all new part that works great the first time.