COMP CAMS CL12-600-4 AtlanticSpeed call 1-803-548-6991 for quick and easy credit card payments Mon-Fri 10:00AM to 4:30 PM EST. "Over 25 Years of  Selling Top Quality Parts at Discount Pricing & Top Rated Service" FEEDBACK COMPARE US TO ANY SELLER CONTACT US PAYMENTS SHIPPING & COMBINED SHIPPING RETURNS ABOUT US SEARCH BY PARTS FOR YOUR ENGINE   FREE AtlanticSpeed  COMP TEE SHIRT!!!   COMP Cams #CL12-600-4 Thumpr™ SMALL BLOCK CHEVY HYDRAULIC FLAT TAPPET CAM & LIFTER KIT FOR SMALL BLOCK CHEVY 262-400, '55-'98 NON-FACTORY BLOCK   INCLUDES THUMPR CAMSHAFT PLUS COMP CAMS 812-16 HIGH ENERGY HYDRAULIC LIFTERS   THUMPR™ – High performance street, stock converter ok, best with 2000+ converter and gears Choppy/Thumping idle   Now available for hydraulic flat tappet applications, COMP Cams® new Thumpr™ Camshafts are the hottest cam series to hit the streets in more than a decade. Street rodders and muscle car enthusiasts just can’t get enough of the incredible exhaust sound and equally impressive performance delivered by these innovative camshafts. Applying a new camshaft design concept originally created for sports car endurance racing, the COMP Cams® engineering team incorporated early exhaust valve opening, long exhaust duration and a generous amount of intake and exhaust overlap to maximize your engine’s nasty-idling characteristics without negatively impacting power output or streetability.     • Available for carbureted Small & Big Block Chevy, Ford 351 Windsor and Chrysler Small Block engines • Long exhaust duration & other design characteristics produce a “serious power” sound • Excellent hp gains & broad torque curve deliver real seat of the pants performance     THUMPR SBC CAMSHAFTS HATED BY NEIGHBORS, ENVIED BY FRIENDS... Musclecar Sound is back and nastier than ever; Thumpr Cams deliver incredible exhaust lope and impressive performance for your Small Block Chevy PART NUMBER   Valve Setting RPM Range  Cam Grind Number Duration Valve Lift @ 1.5:1 Lobe Sep. Angle Int. Ext. Adv. @.050" In. Ex. In. Ex. In. Ex. 12-600-4 Hyd. Hyd. 2000-5800 279TH7 279 297 227 241 .479 .465 107°     Related Components...Premium Choices in Red Lifters Timing Set Rocker Arms Push Rods Valve Springs Retainers Valve Locks Valve Seals 812-16 2100 1412-16 7812-16 991-16 742-16 601-16 503-16    3100 19001-16 19004-16  1601-16  1604-16  7372-16  7972-16  26991-16  795-16  611-16     COMP CAMS 812-16 HIGH ENERGY HYDRAULIC LIFTERS Not all hydraulic lifters are created equal! The use of High Energy Hydraulic lifters gives you advantages not found in other brands of lifters COMP Cams High Energy Hydraulic Lifters have a patented constant orifice metering valve that precisely meters oil to the rocker arms. Continuous contact between the metering valve and the precisely coined bottom surface of the pushrod seat is maintained throughout the engines rpm range, eliminating excessive oiling at high speeds. The pushrod seat is made of a special powdered metal iron alloy and heat treated for strength and wear resistance. COMP Cams High Energy Hydraulic Lifters are produced with a longer piston than conventional hydraulic lifters. The extra length is made possible from a counter-bored pushrod seat position. The longer piston is produced with through - hardened steel that provides more bearing surface, and increased lifter longevity High Energy Lifters have a light weight CHECK valve disc that allows for quicker response. This results in increases in engine speed before valve float. This CHECK valve also maintains added control at all engine speeds and loads. Increases in engine speed can be attributed to this quicker response CHECK valve. Don’t take the chance of voiding cam warranties and losing power by using other brands of lifters! We carry a full line of COMP Cams performance parts in our eBay Store. If you don't see the item your looking for, email us and we'll be glad to list it on eBay.