Twin Cam Street Performer Head (Available in Air Cooled or, Water Cooled)
This head features our new port design with a fully CNC ported intake and exhaust ports that provides the most efficient flow rates. This head features 1.900 intake valve and a 1.610 exhaust valve. Our chambers are also CNC ported to provide consistency between each head. It features a 1.710 inlet opening (available in different sizes upon request).
Due to core shift in some Harley heads there may be areas where the CNC machine does not touch.
Click the Head Details tab for a complete description of parts and labor. For more details on the best fit for your riding style – call 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.
|Valve Sizes||1.900″||1.610″||-.003 / 91cc|
|Valve Spring Installed Height||1.860″||1.860″||-.020 / 88cc|
|Valve Spring Seat Pressure||178lbs||178lbs|
|Valve Spring Pressure @.600″ Lift||360lbs||360lbs||-.040 / 85cc|
|Valve Spring Travel||.770″||.770″|
|Valve Seal/Top Retainer Clearance||.835″||.835″||-.060 / 82cc|
|Available Inlet Sizes||1.710″||1.760″|
*These heads are set up to clear a cam TDC of Intake 215 and Exhaust 204 valve to valve clearance. They can be modified on request.