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Old 11-03-2009, 09:55 AM
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I tore my hair out trying to eliminate an off idle bog on my 418W when I had a Holley 850 on it. I did everything and more to work around it and gave up, sold the carb. I bought a 650 Mighty Demon with mechanical secondaries, modified the timing as elmariachi explained. Instant off idle response, no bog. I gave up about 12 HP at the top end for 15 lbs. increase in torque thru the midrange using the 650 MD. Not a bad trade-off. I tweaked the jets a little on the chassis dyno and have used this combo for 4 years now.
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