Here's the March link. PONTIAC BIG BLOCK V-GROOVE PULLEYS Set #4220, I purchased my set from Jegs or Summit. Do a search on those sites for that part number. They are a bit on the pricey side!
I just saw that they are stating that the pulleys have a black powdercoat. My set bought a few years ago came in a clear powdercoat. They also list it as a aluminum/steel kit. I thought all my pulleys were aluminum, however, the alternator pulley may have been steel. I'd take a look at my set, but they are sitting in their box in my shed. Too many other things to worry about first.
This kit is much different than the stock size! Crank is much smaller and W.P. is bigger. This kit comes with Allen head bolts for the crank. The stock crank bolt heads are to wide to fit in the new pulley.
Now, with that being said, I don't have a N.A. to compare to. So, I don't know what the size difference would be for that motor.
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Tim Paul
85 T-Top GN
"New" GM crate motor, 87 ECM swap, vacuum brakes, 2800 stall conv., shift kit, Kevlar bands, etc., LT1 MAF, MAF Translator, Heated 02 sensor, TPS TEC, Cold Air intake, Extender chip, KB headers, KB 2 1/2" exhaust, gutted cat, F.P. Hot wire kit, Walbro 340 F.P., Adjustable regulator, Green strip injectors, Electric fan, T.B. coolant block-offs, Powermaster 140 amp alternator, adjustable wastegate, 160 thermostat, Auto Meter FP and Boost gauges
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