[QUOTE=sherwood;3082769]oye

stock flow:
PR3(B18)>P72(GS-R)>PR3(B16)

modified flow:
P72(GSR)>PR3(all)

compression:
P72>PR3(all)


as you can see modified the p72 will beat it out in both sections. unmodified the pr3 from the ITR has bettter flow, but the compression loss is greater than what is gained from the flow, so it's a mute point.

the gsr head is hands down the best b-series head that was produced, the only reason the ITR got the pr3 head is because there were too many stockpiled from the old b16's.

cam profiles are a whole other story, but it's not like it matters, without the compression to back up the more agressive profiles there isn't much to gain. the type-r merely overcame this by using pistons with an increased dome volume to increase compression.[/QUOT

u listed that, but u did notshow at what rpm. the gsr head will out flow a b16 head up at around like 9.5k, but bottom mid and most of ur top end. not many people will rev there motor that high daily.