WHat is the diffrence i have a 99 gsr with p72-2 stamped on the head and i have a 97 sir- motor with p72-1 on the head what the diffrence???

 

I don't believe there isn't any difference. The Type-R/B16 heads are casted PR3-1, PR3-2, PR3-3, and PR3-4. They are all the same structurally (except for the obvious cams, valvetrain and mild porting).

 

So then my jdm head might be a better head than the american gsr head>? if its stamped diffrent its gotta mean something

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SilverejSi-R_g &raquo;</TD></TR><TR><TD CLASS="quote">So then my jdm head might be a better head than the american gsr head&gt;? if its stamped diffrent its gotta mean something</TD></TR></TABLE>

No, not necessarily. I'm just saying the Type-R/B16 heads have the same cast numbers, but with the extra 4th digit. It doesn't mean anything.

 

i read somewhere that their is no dyno'd proof that jdm motors (w/ same internals as usdm) produce more or less power than usdm motors... idk don't quote me on that but yeah... that what i READ

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by spooncivicsi &raquo;</TD></TR><TR><TD CLASS="quote">i read somewhere that their is no dyno'd proof that jdm motors (w/ same internals as usdm) produce more or less power than usdm motors... idk don't quote me on that but yeah... that what i READ</TD></TR></TABLE>

Of course, the CR is different between a GSR and SiR-G motor which accounts for the extra 10HP.

 

bump ..........are the heads the same? the int man,throttlebody,pistons,oil pump and vtec switch are diffrent, what about the head?????????? Hlp

 

ok these gotta be some sort of diffence??? bumpit up

 

The -X number is the mold number at the factory.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlueIntegraBoy &raquo;</TD></TR><TR><TD CLASS="quote">

Of course, the CR is different between a GSR and SiR-G motor which accounts for the extra 10HP.</TD></TR></TABLE> its not a true 10 hp ..they all dyno abou the same whp. depending on how well maintained it has been

 

mmmm i dunno know bout that, the piston head promotes higher compression, so running a real* 96 octane, which ive done, proves to be a noticeable diffrence, Not same hp figures either i would definately say my motor runs pretty strong, just raced a 99 civic hatch with a type s motor, header, int, exhaust, 15inchslipstreams with 205 50 15 t1-s's and i stuck that sob like flys on ****. We raced all over the freewayfor prolly 20 miles or so and he kept pulling, but not by much and on one of my 4 gear pulls, i walked away for him, it was fun??? My friends obd1 gizzer\civic did not pull close to as well as i did- the k20 also said he sould be doing 12's ????? then why was i on his ***????

 

bump ?

 

whassupp