S&S CYCLE Super Stock® Generator Style Crankcases for 1965-'69 Big Twins with Stock Bore - Natural - 31-0010

• Cast from A356 T-6 heat-treated aluminum alloy
• Includes crankcase bolts, washers and nuts, cylinder mounting studs, timing hole plug, magnetic drain plug, assorted breather and oil line fittings, top end oil screen spring and plug, sprocket shaft Timken bearing assembly, oil seal, pinion shaft main bearing race, cam needle bearing assembly, oil pump shaft bushings and installation instructions
• Uses Timken style sprocket shaft bearings and 1958 and later pinion bearings (will not accept 1957 and earlier flywheels)
• Bearing races are all line honed and breather cavity is precision machined to optimize breather timing for maximum oil scavenging
• Machined for 3.4375" cylinders and tapped 1/4"-20 for gear covers, oil pump, tappet guides, timer and timer advance
• 66-69 models use 66-69 alloy inner primary
• Drilled for 5/16" generator mounting bolts
• Generator crankcase gear kit (includes circuit breaker drive gear, idler gear, circuit breaker gear and shims) and shafts must be purchased separately
• Made in the U.S.A.
  
  NOTES: 1936-'69 style oil pump. Includes primary scavenge port machining. Machined for 1965-'69 alloy primary. Engines for 1936-’64 chassis with tin primary must use a 1954-’64 style inner primary cover. S&S Super Stock generator style crankcases are available for stock 37/16" or 35/8" bore, but can be special ordered for bore sizes up to 313/16" and deck heights as much as 3/16" taller than stock. A special order sheet must be filled out for any special order crankcases. Ask your S&S Customer Support Representative or download special order forms from our website at www.sscycle.com/soforms 1936-’54 must use the 1955-’64 style inner steel primary cover. Since all S&S generator style crankcases use 1958 and later style main bearings, stock flywheel assemblies 1957 and earlier cannot be used in S&S crankcases. Flywheel assemblies must have 1958 and later pinion shaft with 1.250" diameter bearing, and a 1954 and later style sprocket shaft designed for a Timken® main bearing. Generator style cases for 1936-’47 knucklehead engines are machined to supply oil to the heads from a boss located near the rear tappet guide or from a stock or S&S gearcover. Provision for oil scavenging from the heads in these crankcases is the same as stock, with passageways that connect the tappet guides to the crankcase breather gear. Crankcases for 1948-’69 engines are machined with a provision to separate the oil supply to the top and bottom ends if an S&S oil pump is used. This feature lets you choose the 1972 and earlier stock "side oiling" system or the 1973 and later split oil system. The stock cast iron oil pump can be used for the "original look" and stock oiling system. If an S&S billet oil pump, part #31-6200 is used, the oiling system can be set-up as stock or updated to a split system. 1963-’65 panhead engines, with outside oil supply lines to the cylinder heads, must use the oil supply port located behind the rear tappet guide or the oil fitting toward the rear of the S&S gearcover. S&S generator style crankcases do not have the stock style "outside oiler" oil supply boss, so special oil supply lines will need to be fabricated.

Fitment Guide

Specs