hello everyone new member but love the site.. Here's my question that I cannot get a straight answer... Is putting a k20a2 head on my k20z3 motor worth the effort? If not what parts from the other k20 engines r worth changing and will give noticeable changes.

 

no it's not. the z3 head is already pretty good and has a better intake manifold than the a2 to start.

 

Thanks that's what I thought