AFR Heads

SM, Edelbrocks, AFR's are not ported, ain't suppose to be on the same league there just suppose to be a step above stock, (Basically instead of running/rebuilding/modding stock heads use one of these) Even TF and CNC SM are just a slight step up from that, not meant to be low 10-8 second heads.

You would need to generally compare them to other 600+ hp heads out there.