STD Development Company - world's strongest aftermarket Harley-Davidson engine components.






SPORTSTER CASES

STD is proud to offer the latest addition to it's family of high performance heads and cases. The '86-90 4-Speed Sportster Case. Like the entire STD product line, the STD Sportster Case combines the highest quality 356T6 "A" prime alloy and precision CNC milling to produce the strongest high performance cases available anywhere.
    STD Sportster Case features:
  • 46,000 lb. Tensile Strength
    6.0 Elongation
  • .100" Wider than stock cases
    giving case greater surface area
    for improved gasket sealing and
    far more strength.
  • Built-in Windage tray and double
    flywheel scrapers reduce oil drag
    on flywheels for increased horse-
    power.

  • 6 Bolt / Line Bored Tranny Trap
    Door - Run either a wet or
    dry primary drive
    (Trap Door made from
    206 T71 "A" Prime Alloy
    50,000 lb tensile strength)
  • Machine fit races
  • 5" Stroke Capability
  • Includes case bolts

4 Speed Sportster Case
Part No. 1994 86-90
(3 13/16" bore)....$1499.00		 4 Speed Sportster Case
Part No. 1994-4 86-90
(4" Piston)..........$1599.00

Available Options: Bearings, studs and line lapping of main bearings,
custom machining, custom bolt patterns and additional racing options.


Soon To Come: 1991-Present 5-Speed Style Cases
and 1972-1985 Iron Head Style Cases.


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