Same cylinder, same builder over the course of 5 years.
"As Cast" pump gas Serval = mid 70's whp.
"Clean-up Port" pump gas Serval = mid 80's whp.
And two race gas Servals that I assume are ported... mid 90's whp.
Here's a Dec 2011 Redline pump gas "as cast" vs "clean up port" Serval.
"As cast" mid 70's whp.
"Clean-up Port", no altered port timings, just shapes, angles and sizes, mid 80's whp.
http://www.bansheehq.com/forums/index.php?/topic/150211-redline-ported-serval/
Here's a May 2015 Redline pump gas "as cast" Serval, no clean up at all, mid 70's whp.
http://www.bansheehq.com/forums/index.php?/topic/182251-redline-421-serval/
Here's a Oct 2014 Redline race gas Serval w/Shearer in-frames, mid 90's whp.
http://www.bansheehq.com/forums/index.php?/topic/178758-redline-421-race-gas-serval/
Here's a Apr 2016 Redline race gas Serval w/CPI in-frames, mid 90's whp.
http://www.bansheehq.com/forums/index.php?/topic/185991-redline-4mil-serval/
"As Cast" pump gas vs "Clean-up Port" pump gas = ~12whp
"As Cast" pump gas vs "Ported" race gas = ~23whp