Typical costs of porting and related procedures...

Harley Davidson head modifications...

• Twin Cam, Evolution, Shovelhead porting packages:
  from $720 labor per pair (Iron Head XL's $860 labor) and up (all parts extra...)
  ...includes decarbonization, measurement/analysis/estimate prep, guide replacement/modification for high lift cams and improved flow profile, before/after flow measurement and file creation, full porting and chamber modification, intake manifold porting and matching to head sets, valve seat recutting with high flow profiles biased to achieve desired air flow curve emphasis, combustion chamber volume equalization, exact current compression ratio calculation with components and deck height in use, calculation of machining requirements for new compression ratio target, valve overlap clearancing, cleaning of head assemblies, valve train/spring set-up, lubrication and head assembly giving you heads to "bolt on" (after verifying valve to piston clearance).

• Twin Cam, Evolution head gasket surface milling:
  $90 labor per pair for set-up and milling up to .050" (additional removal at labor rate)
  ...includes chamfering of sharp edges and cc'ing for volume verification.

• Twin Cam, Evolution, Shovelhead, Iron Head and Pan head dual spark plug machining:
  $180 labor per pair for set-up, precise 2nd spark plug location for optimum detonation resistance, any spark plug thread size desired (optional solid steel thread inserts/custom thickness aluminum plug spacers).
  ...includes chamfering of sharp edges.

• Shovelhead, Iron Head and Pan head gasket surface milling:
  $120 labor per pair for set-up, milling up to .050" (additional removal at labor rate), re-machining cylinder spigot counterbore and counterboring each head bolt hole.
  ...includes chamfering of sharp edges and cc'ing for volume verification.

Other brands of Four Stroke head porting...

• Porting packages per cylinder (2 through 5 valves per cylinder):
  from $180 to $370 labor and up (parts extra)
  ...includes decarbonization, measurement/analysis/estimate prep, guide replacement/modification for high lift cams and improved flow profile, before/after flow measurement and file creation, full porting and chamber modification, intake manifold porting and matching to head sets, valve seat recutting with high flow profiles biased to achieve desired air flow curve emphasis, combustion chamber volume equalization, exact current compression ratio calculation with components and deck height in use, calculation of machining requirements for new compression ratio target, valve clearancing, cleaning of head assemblies, valve train/spring set-up, lubrication and head assembly giving you heads to "bolt on" (after verifying valve to piston clearance).

Two Stroke cylinder porting...

• Porting packages per cylinder:
  from $240 to $360 labor and up (parts extra)
  ...includes decarbonization, measurement/analysis/estimate prep, baseline port area/timing measurement (with deck height in use or planned for use), consideration of compression/squish velocity and exhaust system characteristics and file creation, custom port planning to target individual RPM range of operation, complete and thorough porting/finishing of ALL ports and chamfering of window edges, intake manifold porting and precision matching to cylinder and exhaust manifold porting and precision matching to cylinder.

• Cylinder head alteration and machining, per combustion chamber:
  usually from $60 to $180 labor
  ...services available include decarbonization, measurement/analysis/estimate prep, baseline exact current compression/squish band measurement (with deck height in use or planned for use), consideration of compression/squish velocity targets needed for goals, exhaust system characteristics and file creation, custom head dimensional planning to compliment other engine modifications and fuel to be used.  Complete and precise machining alterations available to head gasket surface, squish band width/angle/recess and radius into pocket as well as custom pocket radius formation.  Final combustion chamber volume is held to .1 cc.

Custom Two Stroke/Four Stroke exhaust design...

• Exhaust system measurement and planning:
  from $140 labor and up
  ...services available include current system measurement/analysis, porting/compression/squish band analysis and compatability, establishment of targets needed for goals and file creation.  Complete engine simulation and custom matched exhaust system dimensional blueprint service is available.  Please note that this is for a dimensional design blueprint ONLY, NOT fabrication of the actual design!  Actual fabrication of custom exhaust systems is done on a very limited, appointment only basis and requires an engine shell and chassis on site here for fitment and building.  For further explanation of two stroke pipe design and simulation, please click here.  For further explanation of custom four stroke pipe design and simulation, please click here.