all the cars/trucks ive had ive used a aftermarket crank pulley. in every case i felt a difference in power. Now who makes ones for the 5.3 2004 trucks and where can i get it and how much are they?

tony

 

Money might be better spent elsewhere as they sometimes cause KR issues.

 

Give ASP pullies a try.

 

I have the ASP pulley, its kinda a pita to install and pricey. It is a very well made piece however. I have no problems with mine, and it is suppose to give you ~12 rwhp. I think that there are other mods you can do that are probably better, but I'm happy with it.

I also vote you replace your clutch fan with some lt1 or ls1 e-fans if you install a crank pulley, it would be the perfect time to do so. You will notice power with the e-fans and pulley.

 

I was told the ASP puley will give 10 to 12rwhp. And installing e-fans is soposed to give another 10 to 12rwhp also.

 

Agreed, ASP is your best bet. I also think they make a woodruff key version if you go supercharged later on to avoid pulley slip.