underdrive pulley kits for 2.8l

[Tonglebeak]

Just wondering if anyone knows of any decent underdrive pulley kits for the 2.8l engine...preferrably a crank/alternator set with a belt included so I don't have to worry about charging issues...

Ebay has them for $140 (O_O), but apparently the crank pulley is 4lbs lighter. Anyone know of any sets as good as that but for a lower price? Is it true that I should expect an 8-10hp gain by using UDPs that are also much lighter than stock pullies?

[bszopi]

Is it true that I should expect an 8-10hp gain by using UDPs that are also much lighter than stock pullies?

On a 2.8L!? Hell no. On a SBC, maybe... Back when FFP was making UDPs, he dyno'd a 5hp gain on a 3100. Figure they start out at ~160hp, that would be a 3% gain. Apply that same 3% to a 2.8L's 120-ish hp, and you come up with just under a 4hp gain.

[1meanz]

mrz makes them, when i pulled mine off i noticed a GREAT difference. i could get 2nd gear rubber befor i pulled it off. now i can just get it to chirp also lost about 4 mpgs. the udp lets the engine rev ALOT quicker.