SKATPAK,

All due respect, nobody is arguing that headers will out perform factory manifolds, of course they will, especially a warmed over engine. The question is, how much gain will Extrude Honed factory castings offer over untouched castings, and is (whatever that gain is) worth it?

Tomr,

My heads were already ported and done so no reason to EH them. Having all 3 done should result in a gain but I doubt it would match what customer ported heads would offer. I guess you could have custom ported heads EH'd as well.