S&S Cycle Sidewinder 3 5/8 Big Bore Cylinders for 1936–1999 Big Twins - Manual (Page 9)

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NOTE: If base plates are to be used, be sure they are in place.
D. Rotate flywheel until rods contact areas to be clearanced. Note angle that must be filed.
E. Disassemble cylinder and connecting rods and file crankcase and cylinder spigot for clearance.
NOTE: A minimum of 1⁄16" clearance is required.
F. Reassemble and check clearance.
G. Mark and grind other crankcase half to identical clearance.
Insufficient clearance between connecting rods and crankcases will cause contact and damage to components.
Piston Clearance
Pistons must be clearanced to avoid contact with each other and with flywheels. See Pictures 4, below left, and 5, below right.
NOTE: Material removed from pistons for clearancing purposes will not adversely affect flywheel balance.
NOTE: Some S&S® kits utilize flywheels with diameters smaller than stock (stock big twin flywheels are 81⁄2"). This is done to maximize piston skirt length.
Our experience has shown that while it is not absolutely necessary to build up flywheel scraper, it is recommended that flywheel scraper be built
up to within .008"-.010" of flywheels to optimize removal of oil from crankcase cavity.
Insufficient clearance between pistons and pistons and flywheels will cause contact and damage to components.
CAUTION
CAUTION
Picture 3
Picture 4 Picture 5