Fastest with Performer RPM heads

deputydog said
What is the fastest someone has heard or seen with the Performer RPM heads on 408?

Looking see if anyone has run those on stout SB…high compression, single plane. solid roller, big stall, 3000lbs, slicks, etc

Ported heads or OOTB configuration?
It would be interesting who has gone with the heads as cast, no mods and what they ran.

There is a thread in the racer section, up top, a sticky,
“Unported head quickness.”