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T-Man’s Upgrade Head for Jim’s

T-Man’s Upgrade Head for Jim’s

This upgrade enhances the fully CNC ported head from Harley-Davidson. The intake comes standard with our 1.800 inlet port to enhance flow. The exhaust port is where we placed most of our attention. When sizing down the exhaust port it becomes much more efficient. We offer two solutions for this issue. Your first option is to increase the exhaust valve size while leaving the port and cross section in its standard shape and size. The other option is our fully welded exhaust port to reshape the port floor and size down the cross section. This is referred to as our welded upgrade and is available at an additional charge.

Heads need to be examined before the welding process begins.

NC State Sales Tax will be applied.

$ 1,155.00
Please contact us to order.

Head Details


T-Man’s Upgrade Head for Jim’s

This head comes with our signature reshaped intake and exhaust ports to enhance flow and port velocity.  We then install oversized intake and exhaust seats. This process allows the intake and exhaust ports to work with our custom made 2.150 intake and 1.630 exhaust valves, with corrected geometry built in. Both intake and exhaust ports are hand finished, then machined with our multi-angled cutters to insure a smooth flow rate. The chambers are fully CNC ported to insure consistency from head to head. This port comes with an optional 1.900 inlet and optional welded exhaust. Check the specifications table for details on compatibility with your existing components. For more details on the best fit for your build Рcall T-Man Performance.

Head packages require your heads to be sent to T-Man Performance for work to be completed.
* When not using T-Man Performance pistons the builder is responsible for checking all valve to piston clearances.
** If during the welding process, heads crack then T-Man Performance is not responsible for replacement and up-charges to repair.


Intake Exhaust Chamber Size
Valve Sizes 2.150″ 1.630″ -.003 / 102cc
Valve Spring Installed Height 1.860″ 1.860″ -.020 / 98.5cc
Valve Spring Seat Pressure 185lbs 185lbs
Valve Spring Pressure @.600″ Lift 420lbs 420lbs -.040 / 94.5cc
Valve Spring Travel .770″ .770″
Valve Seal/Top Retainer Clearance .760″ .760″ -.060 / 91cc
Inlet Sizes 1.800″
Compression Release Options Auto (OEM) Manual