![]() ![]() Thumpr Series cam and lifter kits deliver a substantial power increase over an identical hydraulic flat tappet grind without sacrificing reliability or ease of maintenance. Looking at cams and trying to decide between a couple: Comp 12-249-4 and 12-231-2. It's 4500lbs with a stock converter, 3.73 gears and 33' tires. Should be 9.2:1 compression with the stock wimpy cam. i just had what i thought was a stock 350 with a gm ecm and howell harness installed and it isnt running right. Thumpr camshafts are available in different grind profiles each one will produce a rough, racy exhaust note and impressive amounts of horsepower and torque within a different rpm range. 1 woody80z28 Veteran Member Lifetime Gold Member 5,686 walton, ny usa My truck needs some more 's a stock 94 350 TBI. This gives you a seriously aggressive exhaust note without negatively impacting the power output or streetability of the engine. The lobe profile and grind characteristics of these Thumpr camshafts use a combination of an early exhaust valve opening, a long exhaust duration, and a generous amount of intake and exhaust overlap to maximize the rough-idling characteristics of the cams. In an ongoing quest to provide you with the performance and sound you demand, COMP Cams engineering team proudly introduces the Thumpr Series cam and lifter kits. COMP Cams is bringing the muscle car sound back, and it's nastier than ever! Let's face it-few things serve to grab our attention at a car show or cruise night more than a car with a thumping, high performance idle. ![]()
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