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johnson engine technology, high performance, performance modifications, contact information, parts, service, performance pacages, how to schedule an appointment, testimonials, dyno runs, photos, job status, warranty information
     
J.E.T. Cylinder Head Modifications
cylinder head high performance modifications, higher velocity, better cylinder head flow
go to cylinder head parts
go to CVN port design info
"Bob,
Thanks for the fine job your team performed on the parts that I sent you. It is always a pleasure to open up the boxes and see everything clean and neatly fit and ready for assembly. The combustion chamber CNC work is very nice and I would like to make sure that all of the heads that we send in the future are relieved in that fashion..."
Mark Simiola
Sterling Performance
Lyme, CT
         

 

EVO (Evolution) Heads

Buell Heads

Sportster Heads

 

TC (Twin Cam) 95" Heads

TC (Twin Cam) 106" Heads

General Cylinder Head Labor


(EVO) Evolution Cylnder Head Porting  

 

WORK DESCRIPTIONS

J.E.T. Labor#

Cost

J.E.T. 9.3:1 Compression Ratio (EV-27 head)

Welded, CNC ported, radius valve job and swirl polished intake valves, decked for 10:1 or 9.3:1 compression ratios, and completely assembled with high-performance valve springs

ECH.600

850.00

J.E.T. 10:1 Compression Ratio (J.E.T. 560 head)

Welded, CNC ported intake and exhaust ports with a CNC relieved combustion chamber, radius valve job and swirl polished intake valves, set up for .580" lift, and completely assembled with high-performance valve springs

ECH.601

970.00

J.E.T. 560 CVN head

Welded, CNC ported intake and exhaust ports with a CNC relieved combustion chamber, radius valve job and swirl polished intake valves, set up for .580" lift, and completely assembled with high-performance valve springs

ECH.601.A

1055.00

J.E.T. Big Bore Evolution Cylinder Heads, Designed for Large Displacement EVO Engines

Welded, CNC ported intake and exhaust ports, welded with a CNC relieved combustion chamber, radius valve job and your reconditioned intake valves installed and heads completely assembled

ECH.602

1033.00

J.E.T. CVN Cylinder Head Modifications to S&S Cylinder Heads, Designed for S&S style motors

Welded and CNC ported intake and exhaust ports, welded and CNC relieved combustion chamber, radius valve job and your reconditioned intake valves installedand heads assembled

ECH.603

1050.00


Buell Cylinder Head Porting

 

 

WORK DESCRIPTIONS

J.E.T. Labor#

Cost

J.E.T. XB1 Buell Heads

Welded, CNC ported intake and exhaust ports, radius valve job, completely assembled, set up for stock cams

BCH.XB1

850.00

J.E.T. XB2 Buell Heads

Welded, CNC ported intake and exhaust ports, 7mm to 5/16" valve and guide conversion, radius valve job, completely assembled with high performance valve springs set for max lift of .600

BCH.XB2

995.00

J.E.T. XB3 Small Valve Buell Head

Welded, CNC ported intake and exhaust ports, 7mm to 5/16" valve and guide conversion, radius valve job, completely assembled with high performance valve springs set for max lift of .600

BCH.XB3

1895.00


Sportster Cylinder Head Porting  

 

WORK DESCRIPTIONS

J.E.T. Labor#

Cost

J.E.T. 1200 Sportster Head

Welded, CNC ported intake and exhaust ports , radius valve job swirl polished intake valves, completely assembled with high-performance valve springs set for max valve lift of .555"

SCH.604

1060.00

J.E.T. 1200S or Buell Lightening Cylinder Head Work

Welded, CNC ported intake and exhaust ports , radius valve job swirl polished intake valves, completely assembled with high-performance valve springs set for max valve lift of .555"

SCH.605

1097.00

J.E.T. 883-1200 Conversion Head

Welded, CNC ported intake and exhaust ports, radius valve job and 883-1200 conversion valves, completely assembled with high-performance valve springs set for max valve lift of .555"

SCH.606

1213.00

J.E.T. '04 and later 1200 Sportster Head

Welded, CNC ported intake and exhaust ports, radius valve job, completely assembled, set up for stock cams

BCH.XB1

850.00


Twin Cam Cylinder Head Porting (95")          

 

WORK DESCRIPTIONS

J.E.T. Labor#

Cost

J.E.T. Twin Cam CVN Head Modifications ('04 and earlier models)
(read about CVN style heads)

Welded CVN intake port, CNC ported, radius valve job and swirl polished intake valves, decked for 10.1 or 9.3:1 compression ratios, completely assembled with high-performance valve springs

TCH.607

700.00

J.E.T. Twin Cam CVN Head Modifications ('05 models)
(read about CVN style heads)

Welded CVN intake port, CNC ported, 7mm to 5/16" valve guide conversion, radius valve job and swirl polished intake valves, decked for 10.1 or 9.3:1 compression ratios, completely assembled with high-performance valve springs

TCH.607A

800.00

J.E.T. Twin Cam 95" CVN Head Modifications ('06 and later models)
(read about CVN style heads)

Welded CVN intake port, welded exhaust port, CNC ported, 7mm to 5/16" valve guide conversion, radius valve job and swirl polished intake valves, decked for 10.1 or 9.3:1 compression ratios, completely assembled with high-performance valve springs

TCH.607B

975.00


Twin Cam Cylinder Head Porting (106" and larger)  

 

WORK DESCRIPTIONS

J.E.T. Labor#

Cost

J.E.T. Twin Cam 106" CVN Cylinder Head Modification ('04 and earlier models)
INTAKE AND CHAMBERS
(read about CVN style heads)

Welded CVN intake port, CNC ported, 93cc Hemi combustian chamber, radius valve job, decked for 9.5:1 compression, completely assembled with high performance valve springs, shrink ported

TCH.608

840.00

J.E.T. Twin Cam 106" CVN Cylinder Head Modification ('04 and earlier models)
INTAKE, EXHAUST, AND CHAMBERS
(read about CVN style heads)

Welded CVN intake port, Welded exhaust port, CNC ported, 93cc Hemi combustian chamber, radius valve job, decked for 9.5:1 compression ratio, completely assembled with high performance valve springs, shrink ported 

TCH.609

980.00

J.E.T. Twin Cam 106" CVN Cylinder Head Modification ('05 models)
INTAKE AND CHAMBERS
(read about CVN style heads)

Welded CVN intake port, CNC ported, 93cc Hemi combustian chamber, 7mm to to 5/16" valve guide conversion, radius valve job, decked for 9.5:1 compression, completely assembled with high performance valve springs, shrink ported

TCH.608A

1080.00

J.E.T. Twin Cam 106" CVN Cylinder Head Modification ('06 and later models)
INTAKE, EXHAUST, AND CHAMBERS
(read about CVN style heads)

Welded CVN intake port, Welded exhaust port, CNC ported, 93cc Hemi combustian chamber, 7mm to to 5/16" valve guide conversion, radius valve job, decked for 9.5:1 compression ratio, completely assembled with high performance valve springs, shrink ported 

TCH.609A

1180.00


General Cyilnder Head Labor    

 

Work Description

J.E.T. Labor #

Cost

TC head modification to 1/2 13" breather

Increases breather bolt hole size from 3/8-16 to 1/2-13.  This increases the engines ability to run a crank case vacuum.  Requires running the J.E.T. AIRSTACK or a breather bolt kit for other applicable air cleaner units.

TCHL.609

80.00

TC Hemi Chamber (from 95-106")
TCHL.610
140.00
883-1200 Conversion (boring seats)

CHL.621

350.00

Bead blast cylinder heads

CHL.622

 3 hr labor

Deck cylinder heads (-.005 to .050)

CHL.623

69.00

Install and size valve guides (each)

CHL.624

16.00

Install valve seat

CHL.625

64.00

Convert non-CVN head to CVN (does not include valve job)

CHL.630

175.00

Modify cylinder heads for .580", with CNC relieved combustion chamber and valve job

CHL.626

196.00

Valve job for Big Twins, Evolution, Twin Cam, and Sportster

CHL.627

154.00

Paint Heads and Highlight fins

CHL.628

160.00

Install Compression Releases EVO
CHL.629
240.00
Install Compression Releases TC
CHL.630
160.00
1.900 intake valve upgrade (while heads are being originally modified by J.E.T.)
CHL.632
55.00

 

Prices are based on customer provided heads in good condition.  Previous modifications may eliminate ability to satisfactorily modify heads, or may incur higher cost.  Modifications of street driven motorcycles may be illegal in your area.  It is the customer's responsibility to ensure legality and suitability of any modifications with regard to the intended use of the motorcycle.

 

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