Not true. I did it on a 3.25" main and followed the instructions. It has worked just fine. Yes you have to fill the holes with silicone. Its all in the instructions. You need red high temp silicone and laquer thinner. Push the silicone through the block side with the viton seal a couple times to fill the holes, clean the seal up clean the crank up and cut the seal to length and put it together. It rakes 20 minutes once everything is ready.
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