Not Ranked
AFR makes very reputable products and I use their heads in almost all of my SBF stuff.
However, dyno tests can be manipulated to show whatever results you want. I personally don't buy into the rev kit hype, but if you take a head with inadequate spring pressure to start with, anything over that is going to show results.
You can also gain 75-100 horsepower by using different valve springs. Seen it in person on my own engines. Just because you don't hear the stutter from a floating valve doesn't mean you're not losing control of the valvetrain.
|