When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
There were two limited offers of aluminum pullies. Both were standard sized not underdriven pullies. I haven't seen any for sale now for 3+ years. They did remove a couple of pounds and allow the engine to rev faster.
Any detrimental effects due to the reduced weight? Increated vibration or wear on the #1 bearing? I know on some cars this is an issue when changing to a lighter or underdrive pulley.
From the looks of what Sideways posted those were the ones that Rick's offered. They came in either silver, blue, or red I believe. Nice parts but from what I remember, kinda pricey.
BTW, Sideways, is your intake chamber past your throttle body polished? Your camera flash is giving it some mondo shine.