Im stuck in a delimma. I can go with a k24a1 for 1400 shipped or a k24a4 for 1000 shipped. I have the money for it. I cant decide. My future plans is doing the valve train w/ mild port and valve angle job w/ jsrc. I know if I want to go for a head swap it would be the a1. But I like economy vtec style. Is there a big difference in the heads?