ssheets

iTrader: (1)

Who makes a good set (quality) of underdrive pulleys for an LS1?

TIA

DEEZ98Z

iTrader: (5)

ASP makes crank & alt pullies

onebadz

Def. ASP let us know how it turns out if you purchase one.

Cal

iTrader: (1)

I have an ASP pulley, works great, no problems at all. The charging system has shown no signs of low voltage. In fact, since my car idles at 950, I think I might throw their underdrive alternator pulley on there as well. For just the crank pulley, you need to have an 800 rpm idle speed. Sorry, no before/after dyno results, but you should get about 10 hp, plus the power steering pump should last longer.