Hey everybody, I just recently picked up an LS/Vtec motor from a local junk yard.. The head is stamped PR3-3 and has an Type-R intake manifold.. I think the head is a JDM head but not sure.. So, everyone with ITR and B16 heads, let me know what I've got in hand. I'll try to post pics of my head up soon..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by imoua &raquo;</TD></TR><TR><TD CLASS="quote">Hey everybody, I just recently picked up an LS/Vtec motor from a local junk yard.. The head is stamped PR3-3 and has an Type-R intake manifold.. I think the head is a JDM head but not sure.. So, everyone with ITR and B16 heads, let me know what I've got in hand. I'll try to post pics of my head up soon..</TD></TR></TABLE>Pretty sure, thats a Type R head...Congrats

 

my type r head on my r motor says pr3-4 and a couple other peoples i know says pr3-3 and ANOTHER friend says pr3-4, so its a toss up. you have to actually inspect it more to know.

 

look for green paint by the distributor area

 

Sigh!!

I swear this question have never been asked before

On a more seriuous note, there are other things to look for to determine if it indeed is a ITR head, you have done a search on the subject?

 

Note that the final digit in the head stamping is a random digit from 1 to 4. There's no way of telling the difference between the two just by looking at that particular stamping.

 

The R head should have a mild p&p from the factory. I don't know if you can see
that with your naked eye or not. hth.

 

All b16a/b17a/ITR heads come from the SAME casting, therefore the casting stamp, whether it be PR3-1, PR3-2, PR3-3 or PR3-4 are ALL possible ITR heads.

As for the portwork, it is a very small porting and smoothing (not polishing) of the runner surface on the intake side only, it starts about 1.5 inches in from the port, so if you look into the intake port and see a change in surface appearance about 1.5inches in, AND you have green paint behind the distributor area you have a positive ID on an ITR head.

 

I've done plenty of research.. But it is so hard to find information on the ITR head itself.. It doesn't say anything about the stamps at all. Thats why Im asking people here on HT to see what their ITR's and B16's stamps say. I'll try to post some pics up. Thanks for everbody's help.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by imoua &raquo;</TD></TR><TR><TD CLASS="quote">I've done plenty of research.. But it is so hard to find information on the ITR head itself.. It doesn't say anything about the stamps at all. Thats why Im asking people here on HT to see what their ITR's and B16's stamps say. I'll try to post some pics up. Thanks for everbody's help.</TD></TR></TABLE>

OMG

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92TypeR &raquo;</TD></TR><TR><TD CLASS="quote"> AND you have green paint behind the distributor area you have a positive ID on an ITR head.</TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlueR &raquo;</TD></TR><TR><TD CLASS="quote">look for green paint by the distributor area</TD></TR></TABLE>

 

Where exactly would the green paint be on at the distributor area?? Also, isn't there any chance that the green paint would eventually fade off after years??

 

I'm not sure why I bother helping you when you clearly have NOT used the excellent search function but :

https://honda-tech.com/zerothread?id=1159239
https://honda-tech.com/zerothread?id=852120

and the list goes on and on...

 

What does the green pair mean? My pr3-3 has that
​​​​​​​

 

they do fade over the years. The green paint is from honda, they did this to identify the best castings

 

I have a pr3-3 mine has red paint behind the distributor area... has portwork on the intake side only etc I'm trying to figure out if this is a type r head or a b16 head

 

This is a old thread but for anyone who wants to see the port work here is a pic from my build thread of my brand new out the box Type R head. It is stamped pr3-4 by the way. Note only the Intake bowls are swirl ported, very mild work.


Watch this video on the actual porting being done to the cylinder heads.

You Tube