did some EXCEL spreadsheet on head flow data.

195cc Canfield, 195cc TFS and 191cc AFR intake flow
http://stealthram.com/headflowfiles/190ccintakeflow.gif

195cc Canfield, 195cc TFS and 191cc AFR exhaust flow
http://stealthram.com/headflowfiles/...xhaustflow.gif

AFR191cc vs Sportsman II 200cc exhaust flow
http://stealthram.com/headflowfiles/...manexhaust.gif

AFR 191cc vs Sportsman II 200cc intake flow
http://stealthram.com/headflowfiles/...intakeflow.gif

what you'll notice is that the 200cc heads flow less than the AFR 191cc. ports are huge and velocity has slowed down. so it's not always a good thing to go too big.

 

did some more

factory heads intake flow
http://www.stealthram.com/headflowfi...eadsintake.gif

factory heads exhaust flow
http://stealthram.com/headflowfiles/...adsexhaust.gif

aftermarket and vortec intake flow
http://stealthram.com/headflowfiles/...rtecintake.gif

aftermarket and vortec exhaust flow
http://stealthram.com/headflowfiles/...tecexhaust.gif

2.02/1.60 valves heads under 180cc intake flow
http://stealthram.com/headflowfiles/...80ccintake.gif

2.02/1.60 valves heads under 180cc exhaust flow
http://stealthram.com/headflowfiles/...0ccexhaust.gif