I have a accord ex cb7 with a stock f22a4 engine. I want to add a little more power to it. I was thinking if the f22b1 vtec head would work on the f22a4 block? Or should i just throw in the whole f22b1 engine into my cb7 instead?
I also want to reach around 150ish for power, what mods do i need to reach there?
Please help, i'm new to all of this and i would really appreciate for your time and help. Thanks again...

 

You should be able to bolt the B1 head onto your A4 block but there will be no orifice to remove like if doing a B1 head on a B2 block, so you will have to use a kit like the LS-VTEC guys do. Easiest thing to do (hopefully you have a OBD1 engine) is to swap the engine and put a F23 intake manifold and get it ported for a bigger throttle body and then get the actual throttle body. Those along with a tune on a chipped P28 or something will most definitely put you in (and over actually) the 150hp range.

 

Do not waist your time with a VTEC head swap. I did one personally. I had f22a block, f22b1 head ( ported and polished) bisimoto cam, p28 on crome made 158whp 150 lbft on a dyno jet. It just had no power up top. You would be better off to keep the F22A head, It flows way better than the VTEC head. If you look at the F22B2 ITB setup in the FAQ it has pics showing the differences in the heads. If you want more out of your CB7 I would go one of 3 ways.

1. Build the F22A
2. Swap for a H22
3. Boost the F22A

 

I agree as well, the F22A cylinder head flows far more than a F22B cylinder head.

Here is a picture of a stock F22B on left and a stock F22A on right showing how much larger the intake ports are making it a superior head for high performance.



By investing and building your current F22a head you will see greater results and would recommend going with a Bisimoto Level 2 camshaft re-profiling service along with Bisimoto Pro springs to prevent valve float at higher rpm.

Intake: can be as simple as an H23 DOHC non-vtec manifold which is a direct bolt on to the F22A which has a much larger plenum and runners gaining your additional flow to you cylinder head along with a Bisimoto heat shielding intake manifold gasket to reduce heat transfer from the cylinder head to the intake manifold. This will allow for cooler denser air going into your combustion chamber resulting in more power.

Header: Bisimoto V2 header will help extract and improve the scavenging effect drawing exhaust gasses out efficiently and in turn drawing in more intake charge into your combustion chamber. This will greatly impact your horse power and torque!

Block: Increasing your displacement and static compression ratio will greatly help with the other performance modifications by increasing cylinder pressures. Bisimoto offer forged pistons kits for the F22 with several compression ratios which are designed 1mm larger than factory which will increase displacement and give perfect ring seal after a proper bore/hone is performed to your cylinder block.

Tuning: To tie all these performance modification it is very important to invest on proper engine management as well tuning. By optimizing fuel and ignition maps you will not only gain performance, you will also gain reliability, driveability and even gas mileage.

 

Funny to read the ax vs bx... What a crock. Research people. What RPM range do you want? What lift? etc. In fact, the stock f22b1 head outflows the f22ax head until .500" lift. That is when the ax heads take the lead. The F22b2 has a superior exhaust port than the other SOHC F heads. Not knocking Bisi's contribution to the Honda marketplace. But, a bit of research goes a long way. Julio, is really a cool guy. Spoke with him on the phone a couple of times, and really gave some good advice.