I am replacing the rear rope style rear main seal in the 455 buick motor that is in car with a new Viton seal, with motor in car & was wondering if anyone knew if the 455 Buick from 72-75 had the anti rotation holes in the block for the stock rope seals as they have to be filled with silicone if there were, There is no holes in main cap for anti rotation but I was told Pontiac had them & also some of the Buicks had them in the block, I have no way of telling without dropping crank down which I would prefer not to do if at all possible, I was also told if there are none in cap there is none in block, If anyone know for sure Please let me know ? Thanks Perk
early eighties Ford 6 cylinder neoprene rear main will work. I just did it on my last Buick 455. Not a drop!!
The Jalopy Journal
