here is a dyno chart of an LSVTEC using a B16a head plotted against a LSVTEC w/ a B18C(1) head

"Subject: LS/VTEC with GSR head VS B16A head similar mods.
This is a VERY good comparison to look at...
Question: What is the best head to put on my LS/VTEC, GS-R or B16A?
Answer: In the opinion of Atomic and myself, I have to go with a GS-R head.
Look at the graph...here is the 2 motors..
On 1 side we have the LS/VTEC B16A head...coming in at 180 HP...
The bottom end is EXACTLY the same as the GS-R LS/VTEC...exactly...
so it makes for a good comparison.
B16A has:
port flow port/polish (mild)
Civic Type-R intake cam
ITR exhaust cam
Comp valve springs/retainers
Type-R intake manifold
GS-R head has:
Stock head
Stock valvetrain
Stock intake manifold
ITR cams, intake and exhaust.
and it made a little more power, as you can see by chart.
With the GS-R head, you also will definitely get more torque.
For the money though, B16A head is a good choice.
Remember, this is not a perfect test, it just shows a pattern....
Jeff"
go here for more comparison info
http://www.importreview.com/performance.html