Re: Scat model B rear oil seal
The Dan McEachern kit requires some machining of the rear main cap and line boring to finish. Pinning the main cap is also advised to locate. This is for use with the Scat crank, to use a standard crank the rear of the crank will need building up using a seal ring from Dan also (requires welding and machining). I believe others do similar kits or will do the work for you but I have only dealt with Dan and have just had the machine work done for my Scat crank. The parts from Dan are excellent as is his communication and shipping times.
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