Cylinder Head Upgrades

Johnson Engine Technology, Inc. © provides you with the best Cylinder Head Technology that is available.

Our years of racing experience has given our cylinder heads a lot of high rpm abuse to look back upon.
This enables us to provide you with the most reliable cylinder head.

We have learned:

  • What are the best manufactured valve train components.
  • How to setup valve springs for longevity.
  • What the best head gasket machining procedures for gasket sealing are.

All our port designs have been developed for the best spread of power throughout the entire rev range.
We have not just tested our designs on the flow bench and the dynometer, but on the race track as well.
We didn't just test we won!



Evolution Big Twin Heads

JET 9.3:1CR Head (EV-27)
935.00

Work Description: Welded, CNC ported intake and exhaust ports, Radius valve job and New valves, Set up for .495 Lift.

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JET CVN10:1CR Evolution Heads (High Lift Cams)
1,050.00

Work Description: Welded, CNC ported intake and exhaust ports and have a CNC relieved combustion chamber, radius valve job and new valves, Set up for .580” lift and completely assembled with high performance valve springs.

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JET Big Bore Big Twin Cylinder Heads (For Large Displacement EVO Engines) 96”-106”
1,100.00

Work Description: Welded, CNC ported intake and exhaust ports, combustion chambers are welded and given a CNC bath-tub chamber. Heads are given a radius valve job and new valves. Completely
assembled with high performance valve springs. Set up for .640” cams.

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JET CVN Modified S&S Cylinder Head, 113”-124”
975.00

Work Description: Welded, CNC ported intake and exhaust ports, welded and CNC relieved combustion chamber, Radius valve job and polished valves, Completely assembled with high performance valve springs. Set up for .640” cams.

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Sportster Heads

JET 1200 Sportster Head
935.00

Work Description: Welded, CNC ported intake and exhaust ports, Radius valve job, new valves, Completely assembled with high performance valve springs set for a max valve lift of .555”.

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JET 1200S or Buell (96-02) Cylinder Head
935.00

Work Description: Welded, CNC ported intake and exhaust ports, Radius valve job, New valves, Completely assembled with high performance valve springs set for a max valve lift of .555”.

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JET 883-1200 Conversion Head (No Welding)
600.00

Work Description: Pocket-ported intake and exhaust ports, Radius valve job and 883-1200 conversion valves, Completely assembled.

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JET 883-1200 CVN Conversion Head
1,100.00

Work Description: Welded, CNC ported intake and exhaust ports,Hemi Chambert, Radius valve job and 883-1200 conversion valves, Completely assembled with high performance valve springs set for a max valve lift of .555”.

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JET 04 and Later 1200 Heads
654.50

Work Description: Welded, Raised floor Intake ports  and ported exhaust ports, Radius valve job, , Completely assembled, Setup for .560” cams.

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Buell XB Heads

JET XB1 Heads
750.00

Work Description: Welded, raised floor intake ports and ported exhaust ports, Radius valve job, Completely assembled, Setup for .560” cams.

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Twin Cam Heads 95” and 103”

JET Twin Cam Heads CVN ‘04 and Earlier
850.00

Work Description: Welded CVN intake port, CNC ported, 7mm, radius valve job and new valves, Decked for 10:1 or 9.3:1 Compression Ratios, and completely assembled with high performance valve springs.

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JET Twin Cam Heads CVN ‘05
850.00

Work Description: Welded CVN intake port, CNC ported, radius valve job and New valves , Decked for 10:1 or 9.3:1 Compression Ratios, and completely assembled with high performance valve springs.

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JET Twin Cam Heads, Raised Floor, ‘06 and Later
750.00

Work Description: Raised Intake Floor, radius valve job and new valves , Decked for 10:1 or 9.3:1 Compression Ratios, and completely assembled for .555” cams.

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Twin Cam Heads 113” and Larger

JET Twin Cam 113” CVN (int and chamb) ‘04 and Earlier
975.00

Work Description: Welded CVN intake port, CNC ported, 93cc Hemi Combustion Chamber, radius valve job, new valves, decked for 9.5:1 compression ratio, completely assembled with high performance valve springs.

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JET TWIN CAM 113” CVN (int, exh, chamb)’99-’04
1,100.00

Work Description: Welded CVN intake port, Welded Exhuast port, CNC ported, 93cc Hemi Combustion Chamber,radius valve job, New valves, decked for 9.5:1 compression ratio, completely assembled with high performance valve springs.

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JET TWIN CAM CVN (int, chamber) ‘05
1,000.00

Work Description: Welded CVN intake port, CNC ported, 93cc Hemi Combustion Chamber, radius valve job, New valves, decked for 9.5:1 compression ratio, completely assembled with high performance valve springs.

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JET TWIN CAM, Raised Floor (int, chamb) ‘06 and Later
975.00

Work Description: Raised Floor Intake Port, 93cc Hemi Combustion Chamber, radius valve job, New valves, decked for 9.5:1 compression ratio, completely assembled for .555” cams.

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TC Head Modification to 1/2 13 Breather

$88/hour. Please call 401-596-9507 to get an estimate and to schedule the project.

Bead Blast Cylinder Heads

$88/hour. Please call 401-596-9507 to get an estimate and to schedule the project.

Install Valve Seat

$88/hour. Please call 401-596-9507 to get an estimate and to schedule the project.

Convert Non-CVN JET Head to CVN
192.50

 Does not include valve job.

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Valve Job for EVO, Twin Cam or Sportsters
175.00

Sand Blast Ports and Chamber, Valve Job, Clean and Assemble.

Does not include parts.

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Install Compression Releases (TC, Spark Plug Side)

$88/hour. Please call 401-596-9507 to get an estimate and to schedule the project.

Sand Blast, Paint Pair of Heads

$88/hour. Please call 401-596-9507 to get an estimate and to schedule the project.