are underdrive pullies really woth the $70? do they make that big of a difference? i have heard conflicting stories like they drain too much power off your alternator and they make your car idle lower. i know march makes a 2 pully kit (crank and alternator). should i invest??

 

Try doing a search for "underdrive pullies" on the Tech/General Engine board. That should get you more info than you ever wanted to know.

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1990 IROC 350
Mods: Too busy trying to make it run right to mod it.
Airfoil, Dynomax cat-back, MSD coil, 180 t-stat, Bald Eagle tires,
Hypertech fan switch, Accel 23# injectors, Holley AFPR, ported plenum,
Ported Daytona Yellow stock base, Moroso valve covers, other stuff,
Ruger P95DC, hot wife, new oil filter, thick rubber floormats, no cats.
18.0 @ 85MPH since I'm one big-a$$ MF
"It's better to have and not need than to need and not have."

 

A quick answer, no, not worth $70 on a basically stock engine. I felt no SOTP difference but it might add a few HP when your engine revs in the higher rpm's or when you have some good power.

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89 IROC-To see mods go to: http://www.geocities.com/buckeyeroc

 

Underdrive pulleys are definatly a better choice to do after you have done some other mods like exhaust, heads, cam, porting, etc. Save them for last.

 

I have the 2 pulley setup from March. I noticed a little less drain from the A/C and some better pull at higher RPMs'. You do have to get the overdrive pulley for your alternator though!!