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COMP Cams Twin Cam Thumpr Camshafts
Camshafts, Hydraulic Roller Tappet, 235/257 Duration, 0.569/0.569 Lift, Harley-Davidson®, Chain Drive, Pair
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Estimated Ship Date from Texas: Monday 10/26/2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
TC-4101
Part Type:
Product Line:
Summit Racing Part Number:
CCA-TC-4101
UPC:
00036584322573
Grind Number:
TC-4101
Intake Duration at 053 inch Lift:
235
Exhaust Duration at 053 inch Lift:
257
Intake Valve Lift with Factory Rocker Arm Ratio:
0.569 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.569 in.
Valve Lift with Factory Rocker Arm Ratio:
0.569 int./0.569 exh.
Lobe Separation (degrees):
102.5
Quantity:
Sold as a pair.
Notes:
41 degrees of overlap.
COMP Cams Twin Cam Thumpr Camshafts
COMP Cams twin cam Thumpr camshafts are designed as a serious performance upgrade with hard-hitting sound! They feature an aggressive design that provide a thumping exhaust note and they provide a great performance upgrade to any 103 cu. in. and larger twin cam engine. The cams feature a sophisticated "Endurance Ramp" lobe design that makes great power but is easy on the tappets and valve train for long life. They feature a wide power band and pull great up to 5,400 to 6,400 rpm dependent upon the camshafts selected, and engine combination. The cams are made from 8620 billet steel and have been shown to make greater gains in power, acceleration, and throttle response when tested with larger throttle bodies. Put more power to the ground, and make some noise with Comp Cams twin cam Thumpr camshafts.
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