F22b DOHC head question

[HondaBob]

Its hard to search F22b around here and find what I need.

Anyway, just want to verify from what I've read, the f22b dohc and h23a heads are the same correct?


I'm boosting my f22b, and I'm looking for big power. (big turbo) I'm going to need to rev it out a little. I'm just trying to poke around for valve train options and stuff, thats all.


Thanks for any help.

-Bob-

[sulimed]

yes.............. they are about 99% the same

[nucleara]

sorry to thread jack a little but I too have a f22b and after comming back from a float trip this weekend I started the car and it ran/sounded like it was running on two cylinders, I checked for spark and 3 and 4 had no spark cap was replaced because it needed it and I figured I might as well check my timing and after pulling the valve cover I noticed one of the reatiners came off on one of the intake valves on the number one cylinder, but the other is fine. how does this happen and will the valve locks for a b18b non tech work as a replacement? this is assuming I didn't bend a valve.

[HondaFan81]

JDM F22B and H23 heads are same in terms of valvetrain component interchangeability. However, the key difference are the F22B head is for an 85mm bored block and the H23 for an 87mm.

Personally, I say to mate the appropriate sized head with a similar sized block. These H23 heads on F22ax or F22bx blocks are not a good idea IMO. Flow disruption, potential durability and overheating issues, etc.

If you have more specific questions, people that can help are d112crzy and zigenballz.

[d112crzy]

JDM F22B and H23 heads are same in terms of valvetrain component interchangeability. However, the key difference are the F22B head is for an 85mm bored block and the H23 for an 87mm.

Personally, I say to mate the appropriate sized head with a similar sized block. These H23 heads on F22ax or F22bx blocks are not a good idea IMO. Flow disruption, potential durability and overheating issues, etc.

If you have more specific questions, people that can help are d112crzy and zigenballz.

after thinking about it, I'd be inclined to say that the H23 might have better flow characteristics in the chamber due to the bore being 87mm. If the valve angles/spacing are the same on both heads, then that means there's more space around the valves on the h23 head. Kinda like deshrouding valves.

This is all speculation though. I've never seen an H23 head.

[HondaBob]

The lowdown is I have an f22b dohc long block. I just did not know what the aftermarket was for the valvetrain. I'm shooting for high boost and higher than stock rev limiter, and want to play it safe.

[d112crzy]

I revved my old f22b to 7.5k just fine.

But aftermarket valve train is a good choice. Look into Crower.

[HondaBob]

I revved my old f22b to 7.5k just fine.

But aftermarket valve train is a good choice. Look into Crower.

What about bisi? His stuff is pretty reasonable, and dude seems to know his shit.

I'd trust his cams, but how about the valve springs and stuff? Any words of wisdom there?

[d112crzy]

I don't like that guy.

[HondaFan81]

after thinking about it, I'd be inclined to say that the H23 might have better flow characteristics in the chamber due to the bore being 87mm. If the valve angles/spacing are the same on both heads, then that means there's more space around the valves on the h23 head. Kinda like deshrouding valves.

This is all speculation though. I've never seen an H23 head.

Key is you're going into a smaller bore cylinder and you'll have a HG that is limiting as well.. IMO it'd be better to mill (which deshrouds some) or get chamber work done to deshroud the appropriate head. Why deal with all the other garbage to get it to work and rig it up? Simplicity man.

[d112crzy]

True. The hg used is an 86mm one. You COULD have it bored out, but I don't know how much that would cost.

[HondaFan81]

True. The hg used is an 86mm one. You COULD have it bored out, but I don't know how much that would cost.

Another idea is to bore out your cylinder with an appropriately sized head, it gives a deshrouding effect as well. Like 86mm bore for 85mm head.

The H23 head onto F22ax block is the exact opposite and makes no sense. Honestly, people should just buy the JDM F22B motor outright, rather than fitting the head onto an F22ax block, I don't see any point. Basically, doing JDM F22B and F22a hybrids don't make sense to me, just stick with one or the other as they are similar. If you want more compression on the F22ax, get aftermarket pistons or just buy the F22B motor entirely.

[d112crzy]

The F22B goes right onto the f22a block with NO issues. They use the same head gasket and all ports match up. It's not really frankensteining because you're creating a motor that Honda already makes. But I don't think it's worth the power gains unless you spend under $500 for everything.

[HondaFan81]

The F22B goes right onto the f22a block with NO issues. They use the same head gasket and all ports match up. It's not really frankensteining because you're creating a motor that Honda already makes. But I don't think it's worth the power gains unless you spend under $500 for everything.

You didn't understand. I see no point because the motors are so similar, I view it as a waste of time. Settle with one or the other is my opinion and if you want to take it further, get aftermarket parts for it. Really it's just a SOHC vs DOHC preference.

[dbsharp]

The combustion chambers are different in the h23 and f22b heads. the h23 has quench areas while the f22b has a CC shaped like the f22a.