Anyone have any experience with underdrive pullies on a 3.1? I've been looking at them recently, just curious. Any other performance parts worth putting on a 3.1?

 

They are NOT gping to increase your Horsepower and they are more of a issue with charging problems for the alternator. Save your money for gas.

 

Get the heads and pistons from a late model 3100. This is the biggest single upgrade you can do. Our iron heads are a massive flow restriction, to the point that bolt ons are more or less useless on them. Your headers wont work with the alloy heads, so you'll need to switch up.
Start here. 60DegreeV6.com - Site News these folks know these motors inside and out and can tell you how to get north of 200hp on junkyard bits and a little machine work.