PRODUCT DESCRIPTION
Advertised Duration 287/304, Lift .497/.483
Cam Style:
Hydraulic flat tappet
Basic Operating RPM Range:
2,200-6,100
Intake Duration at 050 inch Lift:
235
Exhaust Duration at 050 inch Lift:
249
Duration at 050 inch Lift:
235 int./249 exh.
Advertised Intake Duration:
287
Advertised Exhaust Duration:
304
Advertised Duration:
287 int./304 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.497 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.483 in.
Valve Lift with Factory Rocker Arm Ratio:
0.497 int./0.483 exh.
Lobe Separation (degrees):
107
Computer-Controlled Compatible:
No
Grind Number:
287TH7
Valve Springs Required:
Yes
Camshaft Manufacturers Description:
Mutha Thumpr. High performance street/strip, needs 9:1 compression, 2500+ stall, intake, gears and headers, rough idle.
Quantity:
Sold individually.
Footnotes:
7 - Stock springs cannot be used.
COMP Cams is bringing the musclecar sound back, and it's nastier than ever! Few things grab our attention at a car show or cruise-in like a thumping, high performance idle. In fact, one of the most frequent questions from customers is, "What camshaft will give my car that mean-sounding idle?" For the performance and sound you demand, COMP Cams engineers introduce the Thumpr camshafts—a new series of hydraulic flat tappet cams. The lobe profile and grind characteristics of Thumprs use a combination of early exhaust valve opening, long exhaust duration, and a generous amount of intake and exhaust overlap—to maximize the rough-idling characteristics of the cams. They give you a seriously aggressive exhaust note without negatively impacting the power output or streetability of the engine. Thumpr camshafts are available in several grind profiles; each one will produce a rough, racy exhaust note and impressive amounts of horsepower and torque within a different rpm range.
