I found a new underdrive pulley for $115 shipped on another forum. Its by KMJ Performance and it says

GM LS1 Fluid Dampened Harmonic Balancer / Pulley

25% Underdrive - S.F.I. Approved



New small block Chevy/GM fluid filled crankshaft damper/pulley. For LS1 Camaro and Firebird applications. Neutral (internal) balance. 25% underdrive (may require different belts). Up to a 12 HP gain is not uncommon.

Balancer is SFI 18.1 certified and tested to 12,500 RPM. Perfect for racing or even street applications. Laser welded steel housing with silicone gel surrounding the internal inertia ring. Dampens engine harmonics at any frequency and RPM. Will not cause spark sensors to retard timing. Provides maximum protection and performance for serpentine belt systems!

Is this a good pulley? Belts dont come with it, and i was wondering how i would find out what belt would fit it.
Any input is much appreciated!

 

yes sounds good to me

 

thanks, i just have never heard of a fluid filled underdrive pulley

 

I thought everyone was aware of this type of dampener. Fluidampener was a pretty common name in the racing scene up there with ati. I personally went with ATI. More expensive, but the idea of moving parts turned me off. Honestly both rubber and fluid types have worked out fine for some big names. I would say buy it, and let us know how it works out.

 

Just ask the parts store guy to match these belt numbers 11-760K6 (accessory) and 11-378K4 (a/c). They can cross reference it and give you their brand.

 

I have a March fluid dampened pulley no probs. ATI (polymer dampened) is the way to go though barring no budget.... 90%+ of all hardecore LSX racers run ATI for a reason....

 

dang wish i'd seen this a week ago, orderd a slp! that sounds like the same damn thing

 

link us up man....

 

Found it online guys... even cheaper then what the OP found it for...

 

pm me with linkys please

 

werd^

 

When I bought my underdrive pulley I was told by the guy on the phone at a sponsor that they had been having trouble with the march fluid filled pullley but I havent heard of any troubles with them here.Good price though.

 

Anybody have any opinions on this one? Thanks!
http://store.summitracing.com/partde...16+4294908198+


This one isn't too bad either -
http://store.summitracing.com/partde...5&autoview=sku

 

ebay is the KMJ if I remember correctly