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S&S Twin Cam Engine Cases

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S&S Natural Twin Cam Engine Case - 40 in. Bore

Dennis Kirk Part #: 149977

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Quantity (S&S Twin Cam Engine Cases):

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Offer ends Jan. 1, 2009
S&S Twin Cam Engine Cases
S&S Twin Cam Engine Cases 149977
  • Replacement Twin Cam "A" engine cases for stock H-D chassis only
  • Feature greater overall strength than stock crankcases
  • Strong, dependable Timken-style sprocket shaft bearings
  • Clearances 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
  • Include S&S crankcase breather reed valve designed to eliminate oil carry-over and oil scavenging problems
  • Rear motor mount bolts directly to the stock transmission; fully compatible with the stock primary, charging system, and other stock components
  • Available with stock bore (ideal for replacement applications), 4" bore (ideal for use with the S&S Super Sidewinder Hot Set Up Kits), and 4 1/8" bore engines with stock or S&S cylinder stud pattern (ideal for custom applications and for use with the S&S 124" Hot Set Up Kit
  • Available with natural aluminum, black powder-coat or polished finish
  • Made in the U.S.A.


  • NOTE: Installation in 99-06 FLT models requires oil line installation kit PART #14-9987, but the stock transmission cover may be used.

    NOTE: Installation in 99-05 Dyna models require oil line installation kit PART #14-9986

    NOTE: This project requires a skilled technician. It is the responsibility of the person assembling the parts to check all clearances and assembly specifications.

    NOTE: This item ships in 3-4 days after the order is placed

NOTE: Includes manufactures statement of origin (MSO)
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