Here's a taste of what the cam sounds like. I'm guessing the 600 would probably be more than adequate for what you want but get more opinions than mine. Alot of people say these are just a noise cam but they are more than just a gimic. Here are the three Thumper Cams for comparison.

These are links to the arcticles if anyone is interested. As for the vaccuum all I can say is it hasn't been an issue for me but i am running a smaller dual diaghram booster also. I got what I wanted A mean sounding car that goes like H*LL and is still very streetable. Could I have gotten the same/more power for less money? Maybe. Wonder what it would make with a bigger carb and some matching? Could I have made more power with another cam? Probably. Even thou I am still running a modest Holley 750 w v/s ($50 second hand)dyno numbers were 553/530+. I really enjoy the sound this thing makes and I assure you this thing hits a mean lick. I basicly followed the Iron Man build but substituted Forged JE Pistons for the KB hyper's (same specs) and used the hydrallic roller used in the Howitzer build. My build is a cross between two builds done in PHR. 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.Click to expand.I've done it. They give you a seriously aggressive exhaust note without negatively impacting the power output or streetability of the engine. 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. 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. Street, power touring and some strip.3,5 rear gears, Tremec TKO 600 5 speed. Specs are : 1980 Fairmont Futura 3400 lbs. COMP Cams Thumpr Hydraulic Flat Tappet CamshaftsĬOMP 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. I have been happy with the Comp´s Extreme Energy hydraulic roller cams but now that I have a new 408 W, I would like to try one of Comp´s new Thumpr cams.

Mutha thumpr cam 350