you dont gain any HP from a pulley. you gain engine revs and throttle response. no HP. you want a real HP mod? get the Autolite Copper plugs 5325 awesome gains. for less then 10 bucks.I saw that. I just received my intake from INGEN (will install tomorrow) and I had an aluminum pulley installed today along with a throttle controller. picked up about 18 HP with the pulley and the throttle response is great.
no worries mate. dont listen to the plug they tell you will work. the ones offered in auto places are too short for the NEW tigersharks by almost .5 inches. i found out the hard way. the 5325 are the ones to use. im running a .055 gap and will probly go to .060 gapMy experience is a little different. with a lightweight pulley you should gain some HP. But I am an old school hot rodder and usually accompanied the pulley swapwith a different cam and/or pistons upgrades.
Good tip on the plugs, they are going to be replaced really quick..