Crankcase for 1999–'06 HD<sup>®</sup> Twin Cam 88<sup>®</sup> A Engines (except 2006 HD<sup>®</sup> Dyna<sup>®</sup>), Stock Bore, Stock Stud Pattern - Wrinkle Black
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Crankcase for 1999–'06 HD® Twin Cam 88® A Engines (except 2006 HD® Dyna®), Stock Bore, Stock Stud Pattern - Wrinkle Black

Item #: 31-0172A
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This stock bore crankcase is intended to replace the crankcases in HD® Twin Cam 88® engines in existing HD® chassis only. S&S stock style crankcases have a rear motor mount that bolts directly to the stock 1999-'06 transmission for all models except 2006 HD® Dyna®. These crankcases are compatible with the stock primary, charging system, and other stock components. S&S replacement crankcases are not available for HD® Twin Cam 88B or 2007-'16 HD® Twin Cam 96 or HD® Twin Cam 96B engines.

Features include:

  • Greater overall strength than stock crankcases, especially in the front motor mount, an important consideration in high performance applications.
  • All S&S crankcases use strong, dependable Timken® style sprocket shaft bearings to stand up to the most demanding applications.
  • Clearanced for strokes up to and including 5".
  • All passages between the crankcase cam support plate are o-ring sealed.
  • Compatible with most stock components.
  • Cam chest has clearance for up to .675" lift cams.
  • Includes the S&S crankcase breather reed valve for HD® Twin Cam 88® engines designed to eliminate oil carry-over and oil scavenging problems.
  • Black Finish. 
  • Oil line installation kit PN 31-0424 is required for installation in 1999-'05 HD® Dyna® models. This kit includes a special transmission top cover and oil lines.
  • Oil line installation kit PN 31-0425 is required for installation in 2000-'06 FLT models. Stock transmission top cover may be used.

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Exempt from emissions tampering regulations under CARB EO# D-355-10 when used in 1999-2006 models originally equipped with 1449cc engines