s14 head on s13 block

[hungryjoseph]

yes, I've searched and I've found some useful information. however, there is one question that i can't find the answer to.

I've had both the s13 and s14 block and heads side by side, and the only difference I see in the blocks is the extra oil passage for the vvt, which is common knowledge by now. Can I get an s13 block and put my s14 head on it using an s13 intake cam and sprocket and delete the vvt? would the extra passage in the head cause any issues?

why would I do this? mainly because I can get my hands on a built s13 block, and I already have the s14 wiring harness, ecu, intercooler piping, etc.

[sam_swe]

I would also like to know this. I have a s13 sr20det block I would like to use with my s14 head (Im not using the vvt). Can I use the s14 head gasket?

[Hijacker]

I'd be wary of doing it. I've had S14 head gaskets on S13 blocks, and the passage for the VVT oil galley overhangs the S13 block castings. In short, the S14 head will overhang the block there as well, and I could foresee oil leakage there.

[garagelu]

I'd be wary of doing it. I've had S14 head gaskets on S13 blocks, and the passage for the VVT oil galley overhangs the S13 block castings. In short, the S14 head will overhang the block there as well, and I could foresee oil leakage there.

I have not seen this in person yet but I am going to be attempting to do the same thing here in the next couple days. Even if the VTC oil oil passage overhangs, my plan is to plug it up somehow. Either by welding it or plugging it up. I haven't seen it in person yet so don't know yet.

I am almost 90 percent sure everything will bolt up. My main headache right now is figuring out how the IACV will work. I am going to be using a s13 harness with a s13 power fc. Does anyone know if the power fc interfaces with the IACV. I know stock ecu obviously does. Another thing is the s13 IACV has one plug with a pigtail and the s14 has two female plugs on the unit. I havent compared the two yet but I want to see if I can swap the AAC valve over.

I'm picking up s14 head, intake manifold and all the additional stuff up tomorrow from a friend. Bascially everything from the block up.

[hungryjoseph]

I have not seen this in person yet but I am going to be attempting to do the same thing here in the next couple days. Even if the VTC oil oil passage overhangs, my plan is to plug it up somehow. Either by welding it or plugging it up. I haven't seen it in person yet so don't know yet.

I am almost 90 percent sure everything will bolt up. My main headache right now is figuring out how the IACV will work. I am going to be using a s13 harness with a s13 power fc. Does anyone know if the power fc interfaces with the IACV. I know stock ecu obviously does. Another thing is the s13 IACV has one plug with a pigtail and the s14 has two female plugs on the unit. I havent compared the two yet but I want to see if I can swap the AAC valve over.

I'm picking up s14 head, intake manifold and all the additional stuff up tomorrow from a friend. Bascially everything from the block up.

why don't you use the s14 harness and ecu?

[garagelu]

Well considering I just spent 200 dollars to buy a brand new sr harness and then paid 325 dollars to have taylor durdan redo my whole harness and then plus the 750 dollar power fc. Oh and then plus the 200 dollars I spent at the dyno to tune it.

Thats why I am not going to a s14 harness and ecu. I havent looked at the two heads and the respective parts yet so I can't give any concrete information but I am pretty sure I can get this to work.

[hungryjoseph]

I think it should work also. the CAS is the same, coilpack harness, o2 sensor, tps, but the iacv and coolant temp sensor I am not sure about

[garagelu]

Ok coolant temp sensor is really easy. The one that goes to the gauge has to be gauge cluster model specific. So if its a s13 gauge buy one for the s13. A 89-94 240sx one will work. And same deal for the s14.

The one that goes to the ECU should be the same for all sr20. And from my experience KA and SR are the same. I know I ordered one for the KA one time and it started blowing out black smoke after I installed it. I knew it was the CTS but thought I ordered the wrong one. So I ordered a sr specific one from phase2 but when I got it, it was the same one and same part number. I installed it and I've been running that ever since. I must have gotten a bad one from the dealer.

[hungryjoseph]

yeah, I was talking about the one that goes to the ecu. I guess the IACV is your only issue with that. how close are you to getting it done? I would like to talk to you about it in further detail, because I have 2 s13 sr harnesses and ecu's, and would be easier for me to get a tune for than my kouki s14 ecu.

[garagelu]

Right now I haven't even started on it but I am picking up everything I need tomorrow. My friend is giving me absolutely everything I need to do this or attempt to do this. I know its been done before but no one has documented it or wants to talk about it.

My first step will be completed this weekend. This is basically putting the s13 head against the s14 head and see the major differences. After that I need to reroute all those coolant lines and other hose that are under the intake manifold.

Then once I make sure everything is going to work, I am going to start prepping my head. I need to swap over my BC valve springs and retainers from my s13 head to the s14. Then possible change valve seal and then for sure deck the head and steam wash it.

My email is [email protected] if you want to talk about this more. I can email you my phone number too.

[90_240sxx]

The one that goes to the ECU should be the same for all sr20. And from my experience KA and SR are the same.

not true there a bit different http://cgi.ebay.com/ebaymotors...123 you should use the one for the s13 sr20 cause the connection maybe different and you should use the s13 sr20 tps as well

[garagelu]

Yes, you are somewhat correct. The only difference on those kouki sensors are the plug. They use the ever so easy pinch plugs instead of those hard to take off clips plugs.

But there are so many of nissan's parts that interchange. This is how they save money. The voltage range on ka, s13 sr, s14, s15 are all the same.

My friend who works at the nissan plant got one of those CTS for me with the pinch plugs but it was for a frontier or something. Then as for the plug all you need is to shave down one side of the sensor plug and use an sr injector plug.
Modified by garagelu at 2:08 PM 2/15/2009

[90_240sxx]

i guess you can do that but its just a bit more work and not a strait plug in but your right it will work that way.

[david200095367]

yeah, I was talking about the one that goes to the ecu. I guess the IACV is your only issue with that. how close are you to getting it done? I would like to talk to you about it in further detail, because I have 2 s13 sr harnesses and ecu's, and would be easier for me to get a tune for than my kouki s14 ecu.

i dont think the tps is the same.

[garagelu]

Actually it is the same. I know the auto s14 sr has a TPS thats a little different but still has the same plug and can be made to work.

[vda240]

any word on this? I blew my bottom end on my s14 SR and cant find a s14 SR short block fs anywhere, can I use the s13 short block???

[garagelu]

Got the setup done earlier this year and has been running mint till now with not one problem yet. My s14 head runs 10x quieter than the s13 too.

[vin diesel]

im not sure how the sr vct is set up but the rb30det guys get the oil line to the vct on the rb25det heads zer...a-nap