I've never had any luck with under drive pulleys with the car having the stock alternator or water pump. I had cooling and charging problems.
Right now I've got a MARCH underdrive crank pulley, the alt pulley with a 130amp alt, and a Cobra overdrive water pump pullley (drives the pump faster). I'm very happy with this set up.
With you mods, I would start saving for a 2600-2800 stall converter for your car. That would make a huge difference.
-Josh, aka the tireburner
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1987 Buick T-type
1998 HD Electra Elide
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