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Old 06-22-2004, 08:52 PM
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still running rich

Me and a buddy have been trying to tune up his 406 small block for some time but still it is running to rich. The motor was built for circle track with an Isky Racing cam #201288 for oval track (2800-7000 RPM) 288 deg, .450 in lift with 1.5 rockers at 007 open and .010 close lifter rise, 244 deg at .050 lifter rise, no valve lift given. The compression is about 10.25:1. We moved the timing to 10 degrees intitial with 21 deg advance on non vacum distributor. The carb is a 750 holley dp with 67/72 jets and a #5 power valve. The motor still runs but the plugs are jet black and there is alot of hassitation, the car also blows plumes of black smokes out the pipes when you step on it. We dont think there is any manifolds leaks, and can't tell if there is something worng with the carb.
any help would be great!

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