What makes an engine sound “cammed” at idle? It’s a combination of early exhaust opening, long exhaust duration, and a lot of valve overlap that add up to that loping idle, and Comp Cams has designed their Thumpr line of camshaft grinds to give EFI and carbed V8’s that classic sound, along with the more practical benefits of improved horsepower and torque.

COMP has engineered these lobe profiles to sound like the end of the world without sacrificing power or streetability, or creating maintenance headaches. Thumpr cams are available in both hydraulic flat tappet and hydraulic roller designs for an astonishing array of domestic V8’s.

Who are we kidding, though, the sizzle on this steak is that sound and COMP offers up three different levels of rumpety-rump for your consideration: Thumpr, Mutha’ Thumpr, and Big Mutha’ Thumpr. How do you know what’s what, though? Easy – COMP has compiled a top ten list of Thumpr YouTube videos. Turn up your speakers and enjoy, but be warned, because we are not responsible if you come down with a bad case of the do-wants after watching.