How to make my '67 ford 352 v8 rumble more and idle more rough?

So I have flowmaster super 10's on it, I've lowered the idle to about 650-700 rpm. It just doesn't sound like I want it to. I want it I sound more drag car like. More like a race engine. Is there anything I can do?

Sorry Mike, your camshaft pick is all wrong. You need something with a single pattern, and a 108 or 110 degree lobe centers (or lobe separation angle- LSA)… Something in the neighborhood of 214 to 220 degrees intake duration. This will close the exhaust valve earlier and allow the engine to begin building cylinder pressure. On a street engine (below 5,800-6,000 RPM) it's all about torque, and cylinder pressure is a buildiing block for bottom end torque and throttle response. This combination of lobe separation and duration should put you where you wanna be in terms of idle, it should accelerate well given the proper converter and gearing for the weight of your vehicle.

Crane's 272 H10 or 266 H10 would work well and not leave you needing a high stall converter.

Sorry, not gonna happen without changing the cam. The 352 was built as a low RPM torque engine and cam selection will be critical. An R/V or towing grind would be best, but may not give you the idle that you are looking for.Go for something with a split duration/lift favoring the exhaust side.

So you want to destroy the powerband of the engine just to get a lopey idle?

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