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  1. #1
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    GSR vs. B16 Head Comparisons.

    Ok i see a lot of the same questions over and over again so maybe i can clear up one.

    Which is "better a GSR or a B16 head for my ls-vtec build?".
    Now before you start saying,
    "B16" or "GSR FTW!"
    lets take a look at both heads in perspective.

    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.
    [B][U]
    Last edited by StinkyTurbo; 04-02-2009 at 07:43 AM.
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  2. #2
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    Good Info man!! Bump for rmy pr3 head!!
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  3. #3
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    Continued...stupid LIMIT

    HEAD FLOW COMPARISON CHART B16(STOCK) VS. GSR(STOCK):[/U][/B]


    Notice that the unported b16a (PR3) head is the same in terms of flow volume compared to the unported b18c1 (P72) head...and it's not as dramatically better as people make it out to be. However the ITR head (a ported b16a head with "intake port bowl-blending" and modified valve angles) compared to a ported GSR head shows it's advantage at the upper rpms.


    Some useful links as well:
    Piston/head/block combo for compression: http://www.lightningmotorsports.com/techpiston.htm

    Sources/KUDOS: team-integra.net Head TECH, GOOGLE, Lighting motorsports tech, Honda USA, EDYN, and others..
    [SIZE="3"] I'd rather be a fast driver... [/SIZE]
    :computer:
    [SIZE="5"]STOP SUPPORTING THEIVES. DONT BUY STOLEN PARTS.[/SIZE]

    show your support and copy this into your sig..

  4. #4
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    good shit man....

    MOD please Sticky this shit so no1 asks this question again....

  5. #5
    And Thats What It Is!
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    b16 FTW. lmao

  6. #6
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    i heard that the GSR head is better for NA cus the smaller combustion camber and the b16 head is better for turbo cus its bigger combustion camber

    b16 head:

    gsr head:

  7. #7
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    great info man!!

  8. #8
    Senior Member SpoonCH22's Avatar
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    Definately good info to know. Should sticky this up.
    The best game there is when your bored, no download required-> Www.duels.com/users/register/gabbyx

  9. #9
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    good info good looking out

  10. #10
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    nice post..lots of good stuff
    drinkpal vtec228

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