F22A1 to H23 Intake Manifold Swap Questions

[Jarrett]

I have that same throttle body for sale in my for sale thread. He'll, I even have a black box.

Also, this is going to be stepping on toes but I would like to share my opinion on this matter. Your car works as is, correct? If so, then not having a proper throttle body yet is not a real problem. You just wait until you do and then you purchase it. Don't look for easy ways out.

[Mishakol129]

I have that same throttle body for sale in my for sale thread. He'll, I even have a black box.

Also, this is going to be stepping on toes but I would like to share my opinion on this matter. Your car works as is, correct? If so, then not having a proper throttle body yet is not a real problem. You just wait until you do and then you purchase it. Don't look for easy ways out.

So you mean I can use the A1 TB and it will work? Concerning the H23 TB, isn't the FITV located on the TB itself, and if so how can a non H23 TB work?

For instance look at this pic of an H23. The FITV is on the TB,

[Jarrett]

Please stop referring to things as A1 or A6.

I just told you that the F22A throttle body will not work a few posts above. What about my most recent post caused you to think otherwise?

[SOHC-FTW]

Buy from trusted members it will save you alot of time. Jarrett is one i trust with ease.

If you want a better manifold than what you've got look into the A6. Only thing you'd have to worry about is hooking up the IAB's, if later down the road you wanted more volume you can put the H23 plenum on the A6 runners.
I have an A6 IM running a p12 with no box straight vaccum my IAB's opened at around 1700. If i decide to keep my cb i will be deleting IAB's altogether.

[Accrdwgnguy]

The reason the F22A throttle body doesn't work is because its a different bolt pattern. You could make an adapter, or just buy the H23 throttle body.

I have to agree with the others. You need to do some research and groundwork yourself, forums are great resources but you can't expect the answers to be fed to you anytime you have a question.

Also, don't be afraid to push your boundaries. Relevant example: I bought a TPI engine with harness for my Malibu. After looking the harness over, I got confused and a bit imitated by all the wires, there were some damaged ones and I didn't know what to do, so I boxed it up and bought another harness. After some extensive research, I pulled that harness out of the box and rebuilt it for my C10 TPI swap. I just decided, "this is what I'm going to do, hope it works!" Guess what, it worked! When something doesn't work, you just have to re-trace your steps and do a bit of troubleshooting, some research on the internet doesn't hurt because your usually not the first person who has had that problem.

[Mishakol129]

Buy from trusted members it will save you alot of time. Jarrett is one i trust with ease.

If you want a better manifold than what you've got look into the A6. Only thing you'd have to worry about is hooking up the IAB's, if later down the road you wanted more volume you can put the H23 plenum on the A6 runners.
I have an A6 IM running a p12 with no box straight vaccum my IAB's opened at around 1700. If i decide to keep my cb i will be deleting IAB's altogether.

Okay, but I have an auto TB, won't I need an auto TB? And can you please tell me if I can use the H22 TB or do I need the H23? Cause the FITV is located on the TB for the H23.

[Mishakol129]

I get it now, they are interchangable. Now all I need to know is what a good price is for these IM's.

[Macaqueistrong]

Check the classifieds I found 3 complete manifolds for $125 shipped and lower. Buying here is no different than buying on ebay, I actually prefer it because members on a forum have a reputation to uphold and a history on the forum. The people you buy from here have a "virtual" face when compared to the random strangers on ebay.

[jdm92_accorn]

Just to let you know I have 2 h23 intake manifolds and a throttle body. One is Like the blacktrax and the other is a slightly massaged stock one. And I dyno tested the iabs I made more power without them all together.

[Mishakol129]

Just to let you know I have 2 h23 intake manifolds and a throttle body. One is Like the blacktrax and the other is a slightly massaged stock one. And I dyno tested the iabs I made more power without them all together.

Its alright I ordered the one from ebay, 65 for the TB and 100 for the IM. Payed more than I should have but its alright, I've made about 100$ in ebay sales this month so its okay.

I was wondering why this upgrade is so great, what is it about the H23 manifold that the F22a1 manifold doesn't have? I heard maybe 5 hp gain. Btw i'm not gonna use the IABS, if anything the P12 ECU since I already have that and don't have the Pt6.

Another question is if it will hinder gas mileage. Does it?

[jdm92_accorn]

actually i noticed a slight increase in mine. another 1 or 2 in the city and 2 on the highway. not bad for a bump in power.

[Mishakol129]

actually i noticed a slight increase in mine. another 1 or 2 in the city and 2 on the highway. not bad for a bump in power.

I was really wondering what the exact difference was with it, like I know it has bigger TB but what else? And the exact hp and tq gain is what?

That's good that it gets better mileage, what a surprise.

[SOHC-FTW]

Really you expect exact numbers? lol no one but a before and after dyno run can give you such information. Asking why its a mod over an a1 after you done bought it and supposedly done research is not bright.

To put it as simple as i can for you the H23 has shorter runners that helps topend and the plenum has a greater volume for air flow. All the in depth information on this IM swap i know for a fact you can find such information in greater detail on this great site. I hope we don't see a thread asking how to DIY h23 IM swap until you check every related thread.

[Mishakol129]

Really you expect exact numbers? lol no one but a before and after dyno run can give you such information. Asking why its a mod over an a1 after you done bought it and supposedly done research is not bright.

To put it as simple as i can for you the H23 has shorter runners that helps topend and the plenum has a greater volume for air flow. All the in depth information on this IM swap i know for a fact you can find such information in greater detail on this great site. I hope we don't see a thread asking how to DIY h23 IM swap until you check every related thread.

I have the DIY is in the bookmarks along with how to connect coolant lines and vacuum lines. Thanks for reminding me.

The biggest difference I see is the plenum and the TB. The a1 has only 4 ports while the H23 has 8.

a1 is pretty measly,




H23,





Would you recommend me port and polish the manifold? I wonder if I can just use some sandpaper, starting with heavy grit then working my way to fine grit. The main reason I am doing this in the first place is because I am going to replace the rear AT mount and need to remove the IM to get to it. I'll hit two birds with one stone...Not a bad idea if you ask me.

[Mishakol129]

Got the IM.

I have some questions. Would you polish the inside of the manifold runners and remove the casting marks right here?




Who knows if it will even make a difference but i'm just wondering if its a good idea to polish it. I don't even know how to do it though.


Another question is about when the butterflies open. They are already open without vacuum. I don't have the PT6 or the black box. Should I leave the vacuum on or off?