B16 (pr3 Stamp Code) Cylinder Head:
-The B16 head and Type-R head are of identical casts.
Both of these cylinder heads are stamped with the code PR-3.
-An ITR head is a ported B16A head from the factory. Both are coded as PR3 heads. So they are the same head but the ITR one (PR3-2) has had better intake valves, stiffer springs, bigger cams, bigger LMD's, bigger ports, steeper valve angles, some bowl blending work done from the factory.(IN B20 terms, FLOWS BETTER, HOLDS HIGH REVS BETTER!)

-The B16 head flows SLIGHTLY better then the GSR head.

-B16 uses a single stage IM with different flange mounting holes than the GSR. You are able to find more IM to the fit on the b16 for this reason.

-B16 heads are easily obtainable and can be had for pretty cheap versus the ITR.

-The intake port approach into the combustion chamber is less vertical and directs the mixture motion into the chamber differently than the GSR.

-Ways To Identify:
* the green paint by the distributor
* thinner ITR intake valvestem (12% lighter vs GSR/Si)
* minor port work by the valve seat in the ports
* dual valve springs on both sides, notice yellow paint on intake side, blue on exhaust side
* lost motion assembly has a blue dot

Part Numbers for:

CYLINDER HEAD:
-b16 head:12100-P30-020
-Type-R:12100-P73-J00
-GSR:12100-P72-000
-JDM civic Type R:12100-P73-J00

GSR (P72)Cylinder head:

-The GSR head's ports are said to be "straight shot" or more vertical or steeper).

-lower head volume in the GSR head works well with dished pistons in FI applications whereas the ITR head's larger head volume works well in N/A high hp motors using domed pistons that fill in the volume.

-The head volume for the GSR head is at 41.6 cc.
-From EDYN:The GSR head has a larger ID to the intake seat than the B16 head which is intended to feed a 1.8 liter engine...We don't see the differences that some seem to believe exist, with the B16 head being more swirl oriented and the GSR leaning more toward tumble. On the all-out killer heads, our best head based on a B16 casing will outflow an equivalently prepared GSR by perhaps 5 cfm at .500 lift and that's not enough to cause one to out perform the other in the real world. The inside diameter of the seat (of an 00-01 ITR head) is also larger than that of a stock B16 head, allowing higher flow rates necessary to feed a 1.8 liter combination.
-The GSR is also has a DUAL STAGE intake manifold.
-the intake port is a larger with a steeper throat cut valve angle. It has less aerodynamic drag from having less internal surface area than the GSR head and GSR 2 stage IM.

ALL this info was found on b20vtec.com ... if you want it down i will happily do so
hope all this info helps out..

 

I have a flow chart of a stock b16 head vs a stock gsr head done by alaniz if you or anyone else wants to see it.

 

yea post it up for sure... its some good info on flow charts..nice to see that there are diffrent heads that you can use to squeeze every little hp out of a 4cyl

 

 

they're the same stock vs stock for flow numbers, GSR raises compression by .2..

 

i always wonder why people say b16 flow better than gsr. look similar in my opinion

 

who cares which head flows better...the real question should always be: which head will make more power on my application! People who can understand that will understand why threads like this one are rediculous.

 

GSR > B16 IMO

b19coupe had both stock heads flowed. GSR flowed better on intake, B16 better on exhaust. iirc this was done at Portflow.

 

LoL @ the ALANIZ pic featuring Michael Delany's name. Why did "mark" it? It's not even his image to begin with.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Combustion Contraption &raquo;</TD></TR><TR><TD CLASS="quote">LoL @ the ALANIZ pic featuring Michael Delany's name. Why did "mark" it? It's not even his image to begin with.</TD></TR></TABLE>

haha i got it from team integra a few years ago.