F20A DOHC NON-VTEC head swap information

[DirtySouthHonda]

What up, CB7Tuners? Just wondering if any modifications have to be made in order for the F20A DOHC Non-VTEC head to fit? One member here has one mounted onto his stock F22A1 block, but little information has been given about these areas of the engine that has been changed or modified. I have searched for some info about this swap, but little to no info was found (Just threads dealing with the F22B head swap). I would like some useful information you may have about this swap I should know about (I.E. modifications to any hoses, IM, bolt patterns, fuel rails, distributor, alternator, timing belt, injectors, ECU, etc, etc) If it's a direct bolt in, any information about that area would be helpful as well.

Thanks.

~DirtySouthHonda

[F20A CB7]

Sup Meng

Why the f20a si head?

The h23/f22b/f20a si heads r all the same.

[DirtySouthHonda]

Sup Meng

Why the f20a si head?

The h23/f22b/f20a si heads r all the same.

Basically cause I don't want to pull my block to add any pistons. I want to increase my HP by adding another head and be different at the same time.

~DirtySouthHonda

[jdm92_accorn]

they're the same, no modification required.

[sulimed]

Sup Meng

Why the f20a si head?

The h23/f22b/f20a si heads r all the same.

not 100% tru. to put a h23 head on a f block you need to honda bond one of the blind holes on the head. but on the f22b you don't have to.

so it would depend on if the f20 head is like the f22b or the h23.

[F20A CB7]

Well credit on bein diff meng, but she's possible, there's a diy on here for h23 head swap, follow that, also buy some Haynes Manuels

90-93 cb
92-96 Lude

take your time meng.

Push come to shove meng, get a bisi cam for ur sohc. @ least a level 2, h23 mani, and chipped ecu, ull b happy for now, and what a lot of peopke 4 get is that no matter how much work they do on the motor, the gear ratio of the trans is the same, upgrade to a h23 of f22b1 accord trans.

[F20A CB7]

not 100% tru. to put a h23 head on a f block you need to honda bond one of the blind holes on the head. but on the f22b you don't have to.

so it would depend on if the f20 head is like the f22b or the h23.

I learn something everyday on here, thanks sumlimed, is there anything else diff about these heads besides that Blind Hole

[sulimed]

I learn something everyday on here, thanks sumlimed, is there anything else diff about these heads besides that Blind Hole

the way the bowl (were the valves faces are) is shaped a lil different. if i can find the thread i'll post

[bagoon316]

The F20A DOHC and F22B DOHC heads are exactly the same. The H23 head is the different head. On those 2 heads you can use the F22ax headgasket as well when you do the head swap unlike the h23 head you would use the F23 headgasket. also the head bores of those 2 said heads are the same bore as the f22 blocks @ 85mm, unlike the h23 head bore is 87mm.

you would use the f22 water pump still, h23 or gsr t-belt, h23 would be a lil loose with max tension and the gsr belt im told is tight but works.

everything valvetrain is the same between F20, F22, and H23 DOHC head though.

[F20A CB7]

Good info homies.

[bruno8747]

The F20A and F22B head are stamped PT2, They are the same as mentioned. The combustion chambers differer between the h23 and PT2 heads

[DirtySouthHonda]

The F20A DOHC and F22B DOHC heads are exactly the same. The H23 head is the different head. On those 2 heads you can use the F22ax headgasket as well when you do the head swap unlike the h23 head you would use the F23 headgasket. also the head bores of those 2 said heads are the same bore as the f22 blocks @ 85mm, unlike the h23 head bore is 87mm.

you would use the f22 water pump still, h23 or gsr t-belt, h23 would be a lil loose with max tension and the gsr belt im told is tight but works.

everything valvetrain is the same between F20, F22, and H23 DOHC head though.

Wouldn't the GSR t-belt snap by being a tight fit? And the H23 belt seems a little too loose for my style of driving. Actually it seems like both of them wouldn't suit my driving style either (fast is more of my style). Is there any other belt that would work? Also, would my F22A1 alternator drain any power or performance with the new head swap?

~DirtySouthHonda

[GenDBlade]

so from what i understand. i can go to the junk yard, go get a f20 head and just bolt it on my f22a1 block. no mod nessesary cept for the timing belt?

[SpdJnky93]

so from what i understand. i can go to the junk yard, go get a f20 head and just bolt it on my f22a1 block. no mod nessesary cept for the timing belt?

Good luck finding an F20A head at a Junk yard!!! They were only produced in Japan.

[jdm92_accorn]

in the end though a bisimoto stg2 cam or a delta 272 would be cheaper and easier upgrade. but if you insist on pulling off the head do a mild port job, better valvesprings and de-shroud the valves. you'll make more power doing that with a delta 272 than the head swap and in the end it'll probably come out cheaper.