Any pulley gains in the 1/4 times or mph or dyno numbers, this is one of my last bolt ons, with a 52MM TB and 4.10's

 

GMHTP has pulleys at 5 hp.

 

Probably 5 rwhp at max on a stock car but id say 1-3.

 

I cant vouch for any recorded gains, but my engine seems to rev much quicker and with more ease than before the pulley. If you invest in one, get the ASP 23% Crank Replacement Pulley. Not that crap piggyback ones.

-Dustin-

 

i see asp is the way to go

 

http://www.ws6.com/mod-2.htm