Anyone running a 3.5" pulley on a 3800 sc? I need the belt size and part number .
Thanks
Louis

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===Always trying to find time to work on cars===
Louis Duet
Baldwin, Long Island, NY
"My mind spins like helicopter blades." -G. Rossdale
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"Blue" <= '85 Fiero GT
3800sc series 2
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"Boo" <= '81 Delorean DMC-12
VIN #5835
Stock PRV engine
Peugot 604 Intake manifold
Exhaust headers
Anti-3rd brake light

658 - GTP/GS/SS supercharged with 3.2 - 3.6" pulley (66 3/8" - 1687mm) http://zzperformance.com/38...serpentine-belt.html

So I just order the 658 one I guess... The zzp site doesn't have much info.

The stock 3800 supercharger belt is a 665 or a 66.5" belt. Goodyear equivalent size 4060665
With a 3.5' pulley you will need a 660 or 66" belt. This is;. Goodyear Gatorback 4060660

Actually the stock belt will fit but it won't be as tight and may slip. I recommend you use the Goodyear Gatorback belts and they are the most slip resistant design available.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

Dennis, thanks for the part number.

Thank you to nightmare cruiser for chiming in too!

Louis

[This message has been edited by Lou and Blue (edited 09-05-2015).]