Indy 360-1 vs Edelbrock RPM heads

coloradohill said

I’m curious why are the -2 heads better?
Thanks

http://www.indyheads.com/images/t_pge/360_tech.pdf

Click to expand...

Unless it's full on race build, and even then the -2 heads hold their own. If I hand port the -1 heads, they make more power but cost more too.