Yes, those are the heads I'm referring to, I know they have a semi-open (110cc) chamber, that's why I haven't confirmed my pistons yet, depending on dome size comp will be around 10.4 with the RPM heads (-14cc dome), and 10.2 with the RR's (-25cc dome).
I asked around before and been told that Performer RPM heads are a great choice for the street, just wandering if switching to RR-O heads will be of benefit...
Thanks!