S&S CYCLE Super Stock® Alternator Style Crankcase for '70-'84 Big Twins with Stock Bore - Natural - 31-0003

The S&S Super Stock alternator style crankcases are perfect for stock replacement and for high performance applications. Pre-clearanced for strokes up to and including 5 inch. S&S Super Stock crankcases are compatible with stock 1970-1999 flywheel assemblies, primary covers, gearcovers, and clearanced for 38 amp alternator stators. 1970–1984 big twins. Natural finish. Available for stock, 3 5/8", and 3 13/16" bore applications.

Stock. . . .31-0003
3 5/8". . . . 31-0004
3 5/8"Bore (small diameter). . . .31-0071
3 13/16". . . .31-0030

• Cast from A356 T-6 heat-treated aluminum alloy
• Machined to accept an oil filter assembly that mounts on the front of stock motor cases
• All races are line-honed and breather cavity is precision-machined to optimize breather timing for maximum oil scavenging
• Additional parts include; crankcase bolts, washers and nuts, cylinder mounting studs, timing hole plug, magnetic drain plug, assorted breather and oil line fittings, oil pressure switch, oil screen, spring and plug, sprocket shaft Timken bearing assembly and oil seal, pinion shaft main bearing race, cam needle bearing assembly, oil pump drive shaft bushing and installation instructions
• Machined for EFI fitment
• Made in the U.S.A.
  
  

NOTES:1981–'84 style oil pump. Includes primary scavenge port machining. Machined for 1970 & later alloy primary.

Specs