Part #3300F $     Rocker Box with Standard Rocker Spindle Support

Part #3300G $    Rocker Box with Eccentric Rocker Spindle Support

Sputhe Engineering’s billet rocker boxes and covers for Evolution Big-Twins and Sportsters, CNC machined from solid 6061-T6 billet aluminum and show polished.  An angled parting line and easy access counter-sunk hold down screws makes for easier, in-frame removal.  One Neoprene O-ring replaces three leak-prone gaskets in the stock sets.  These rocker boxes come with an improved air/oil separator PVC system for high performance 5-speed Sportster and 1993 and up Evo Big Twins.  Sputhe rocker boxes are much more rigid than stock units.  Can also be used to upgrade earlier engines to top end breathing.

Replacement Parts:                                                  

Part #3315 $
Rocker Cover Gasket – Right
Part #3316 $ Rocker Cover Gasket – Left
Part #3318 $ Rocker Box “O” Ring
  • Easy access to bolts for in-frame installation and removal.
  • Clearanced for high lift cams and roller rockers.
  • Fits all Evo Sportsters and Evo Big Twin.
  • Relieved for easy carb access.
  • Increased rigidity ensures accurate valve timing.


Part #3303B $ Eccentric Rocker Spindle Assembly

Originally adapted from the XR-750 racing engine for use on the 60 Sputhe Spectre, our design has proven itself during 12 seasons of drag racing, road racing and street riding.  Eccentric rocker spindles allow the use of lighter and stronger non-adjustable pushrods.  A must for any engine with mechanical lifters.  CNC machined and anodized billet aluminum rocker pedestals are clearanced for any cam lift and can be used with or without OEM Breather assemblies.  Fits all Harley-Davidson TC rocker boxes.  Sold in sets.


Part #3303 $ Rocker Spindle Supports

The same strength and rigidity as our eccentric spindle supports except designed for conventional rocker spindles.  Fits all Harley-Davidson TC rocker boxes.  Sold in sets.


Part #3327 $
Rocker Spindles

Interchanges with H-D part #16622-83.  Fits all TC’s Evolution Big Twins, Sportsters and Buells.  4340 chrome-moly case hardened to 62-64 Rockwell C.  Set of 4.


Part #3327B $
Rocker Spindles for Eccentric Rocker Box


E-Mail: sputhe@hotmail.com

Tel: (530) 268-0887
11185 Lime Kiln Road
Grass Valley, CA 95949-9715

SputheEngineering name, design and related marks are trademarks of  SputheEngineering, Inc.
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