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#1
03-22-2010, 06:18 AM
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Use a cam with a "tight" LSA with LOTS of overlap and low compression ratio. Best recipe I know of for a "rough" idle. Install a Comp 292H cam into a 400 engine about 7.7 to 1 compression ratio, it will give you the sound that you are looking for....but it woln't outrun a Dodge Neon with 2 plug wires pulled off!
Seriously, tight LSA grinds with big lobes make for a "choppy" idle. We like to put a lot of compression in those engines to keep power up at low speeds. Low 10's on the motor requires a LOT of power. You'll need near 700hp at 3500lbs race weight. Mid to high 11's takes about 500-550hp, and is a lot more realistic for a pump gas street/strip type engine.....Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
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#2
03-22-2010, 07:09 AM
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You could also run ported advance instead of vacuum advance at idle.You will hear "more of the cam".I'm not into the sounds fast thing ......,I'd sooner pick a cam for power and streetability not for sound.
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