Rocker Box


Part #3300F     Rocker Box with Standard Rocker Spindle Support

Part #3300G     Rocker Box with Eccentric Rocker Spindle Support

Sputhe Inc’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 60º 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 SpindlesInterchanges 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

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Tel: +1 (530) 268-0887 

PO BOX 2553

Grass Valley CA 95945

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