will a USDM f22b2(sohc-vtec) block fit a JDM f22b DOHC

[PRIMOCB7]

going turbo and i have a chance to obtain a USDM f22b2 block that is built from the crank and up...wanna make sure i can use that block on a JDM f22b dohc head...

[Kabuki]

I suppose it depends on what the DOHC head looks like. I recently compared the head gasket for an H23 with my F22B1 gasket. The bolt holes were all the same, and the cylinders and water jacket lined up fine, but the oil passages were a little different.you may also run in to that problem. I would suggest doing some research to find out what head gasket is recommended to be used with the DOHC engine.

[BustedLX]

Originally posted by PRIMOCB7
going turbo and i have a chance to obtain a USDM f22b2 block that is built from the crank and up...wanna make sure i can use that block on a JDM f22b dohc head...
Most people that try the SOHC to DOHC conversion run into the same problem... the timing belt. Although the heads will probably line up you will probably have to machine a custom pulley on to the water pump in order for the timeing belt to work.

Atleast that is what people wanting to put an H22 head on an F22 lower end have to go threw. Many just don't bother since it's much more work then it's worth.

[WeDgE]

If you had the F22A, you could put the H23 head on it.

I have no idea how this relates to the topic at hand, I just thought I'd throw that out there...:boink:

[Andrew]

Wedge: Have you tried this, or seen it work without the kind of extensive custom work that Busted mentioned? I'm inclined to believe that there would still be some pretty prohibitive problems.

[WeDgE]

Originally posted by Andrew
Wedge: Have you tried this, or seen it work without the kind of extensive custom work that Busted mentioned? I'm inclined to believe that there would still be some pretty prohibitive problems.

I have not done it myself but I will be as soon as I can come up with the cash for the head and ecu...I already have the distributor needed.

Busted was commenting on retrofitting a H22 head on a F22 block...not a H23 head that I mentioned.

An analysis complete with pictures:
http://accordinglydone.com/forum/showthread.php?s=&threadid=2489

[BustedLX]

Originally posted by Andrew
Wedge: Have you tried this, or seen it work without the kind of extensive custom work that Busted mentioned? I'm inclined to believe that there would still be some pretty prohibitive problems.
There is a post right now on HS about someone who went to see a 4th gen and it had an F20A lower end with an F22B DOHC head and it was running fine. The F22A and F20A are the same and the F22B and H23A are basically the same to so I don't see why it couldn't be done.

[PRIMOCB7]

if thats the case, i can't pass this deal up. the f22b2 block has crower rods, je pistons, apr studs...etc...and its all balanced out. don't wanna lose this block, but then i don't want additional headaches either...btw bustedlx, you familiar with South Florida Performance ? coz thats where imma get my manifold from

[BustedLX]

Originally posted by PRIMOCB7
btw bustedlx, you familiar with South Florida Performance ? coz thats where imma get my manifold from Yes I am they make one hell of a manifold. Really nice, In my opinion the only thing SFP is good for is their turbo manifolds.

When I get ready for my turbo I will be getting the SFP manifold.

[Andrew]

Wedge was saying that you theoretically, an H23 head would mate with an F22A block. Personally, I'm quite curious about this. However, Busted notes that the F22B and H23A are basically the same. Also that the F22A and F20A are basically the same... the F20A came in SOHC and DOHC flavors.
So, my question is:
Wedge: you'd bet that an F22A would bolt up to an H23 head?
and BustedLx: any particular iteratior of the F20A you had in mind, or, theoretically, any?

[WeDgE]

Originally posted by Andrew
Wedge: you'd bet that an F22A would bolt up to an H23 head?


Any proof you need is in the link I posted. I will be doing this swap come spring time, when I can afford the head.

[Andrew]

Sorry, I should have read the link in the first place. This looks like a great plan of action. Best of luck to you.

[WeDgE]

:)

Thank ya.

[phatdoughnut]

Originally posted by WeDgE
Originally posted by Andrew
Wedge: you'd bet that an F22A would bolt up to an H23 head?


most likely you would have to bore out the block of the f22a, cause its 85mm, and the h23 head is 87mm.....sounds like a lil problem.... but if you were to use the jdm f22b head, thats a 85mm bore...so that one would get you closer....

[Andrew]

The issue of bore was touched on in the post on AD that Wedge linked to... not covered completely, but touched upon. What it sounds like is that the larger diameter of the head wouldn't be an issue, but I'm no engine builder, and at best I might call myself an amateur mechanic, so I couldn't say for sure.
The gentleman that gouged all this information out over at AD mentioned that swapping to heads from higher displacement engines has been a rather common practice in the past... mainly with old Ford engines.
Anybody else with this kind of experience?