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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

J.E.T. Modified TC SE 110" 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)

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

ECH.600

935.00

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

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

ECH.601

1050.00

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

Work Description: Welded, CNC ported intake and exhaust ports, Combustian chamners are welded and given a CNC bath tub chamber. Heads are given a radius valve job, new valves and completely assembled with high-performance valve springs

ECH.602

1100.00

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

Work Description: Welded and 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

ECH.603

975.00


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

935.00

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

1094.50

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

2084.50


Sportster Cylinder Head Porting  

 

WORK DESCRIPTIONS

J.E.T. Labor#

Cost

J.E.T. 1200 Sportster Head

Work Description: 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

1050.00

J.E.T. 1200S or Buell (96-02) Cylinder Head

Work Description: 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

1050.00

J.E.T. 883-1200 Conversion Head (No Welding)

Work Description: 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.A

600.00

J.E.T. 883-1200 CVN Conversion Head

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

SCH.606

1100.00

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.XB

935.00


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)

Work Description: 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

850.00

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

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

TCH.607A

850.00

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

Work Description: Raised intake floor, radius valve job with new valves. Decked for 10:1 or 9.3:1 compression ratios and completely assembled

TCH.607B

950.00


Twin Cam Cylinder Head Porting (106" and larger)  

 

WORK DESCRIPTIONS

J.E.T. Labor#

Cost

J.E.T. Twin Cam 113" CVN Cylinder Head ('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

TCH.608

975.00

J.E.T. Twin Cam 113" CVN Cylinder Head Modification ('99-'04 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

TCH.609

1100.00

J.E.T. Twin Cam 113" CVN Cylinder Head Modification ('05 models)
INTAKE AND CHAMBERS

(read about CVN style heads)

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

TCH.608A

1000.00

J.E.T. Twin Cam 113" CVN Cylinder Head Modification ('06 and later models)
INTAKE, EXHAUST, AND CHAMBERS

(read about CVN style heads)

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

TCH.609A

975.00

J.E.T. Cylinder Head Modifications for SE 110" Heads
Welded intake port, radius valve job and swirl polished intake valves, decked for 9.5:1 compression ratios, completely assembled with high-performance valve springs
TCH.610 850.00

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

88.00

TC Hemi Chamber (from 95-106")
TCHL.610
154.00
Bead blast cylinder heads

CHL.622

 hourly rate (88/hr)

Deck cylinder heads (-.005 to .050)

CHL.623

65.00

Install and size valve guides (each)

CHL.624

17.60

Install valve seat

CHL.625

88.00

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

CHL.630

192.50

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

CHL.626

215.60

Valve job for EVO, Twin Cam, or Sportsters: Sand Blast Ports and Chamber, Valve Job, Clean Assemble. Does not include any parts.

CHL.627

175.00

Sand Blast, Paint Pair of Heads

CHL.628

hourly rate (88/hr)

Install Compression Releases (EVO, Push Rod Side)
CHL.629
264.00
Install Compression Releases (TC, Spark Plug Side)
CHL.630
88.00

 

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.  If properly installed, J.E.T. modified cylinder heads will improve the performance of your motorcycle.  The amount of performance output is different for all motorcycles due to the different configuations of each bike.  Bikes with our complete recommended packages on them have had consistent repeatablilty on the dyno when properly installed.

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