Your Cart(0)

All H&F Series Engines Have The Same Deck Height!

If all H&F series engines have the same deck height, what does that mean? That means that you can put F23 parts in an H22. Or H22 parts in an F23. Or H23 parts in an H22. Or F22 parts in an F23..... You get the idea.

Why does this matter? Unlike B-series engines, which all have different deck heights and means they must use different length rods whether you're building a B16, B18a or B18c. In the H&F Series world, since the deck height is the same for all H&F series it means that you can swap rotating assemblies easily. Just match your crank to your rods and pistons, then you can put that rotating assembly into any H&F series block. For example, if you have an H23 crank, rods and pistons, but you don't have an H23 block don't worry! You can install that assembly into an F23, or and H22, or even an F20b. You'll just need to consider the bore size and the main journal diameter. 

MAIN JOURNAL DIAMETER: Of course there are exceptions. While the more popular H&F series have 55mm mains, some of the early 90's blocks use smaller mains. Here's the list of main journal diameters by block: 
H22A = 50mm
H22A1 = 50mm
H22A4 = 55mm
H22A4 = 50mm (1997 Only)
H23A = 55mm
H23A1 = 50mm
F20A = 50mm
F20B = 55mm
F22A = 50mm
F22B = 50mm
F22B1 = 50mm
F22B2 = 50mm
F23A = 55mm

The H22a1, H23a1 and F22 blocks have 50mm mains. These are the engines in early 90's Preludes and Accords. (they're easily identified because they're closed deck, see picture below). These engines will only accept cranks that have 50mm main journals. So you won't be putting F23 rotating assemblies or any 55mm H&F series rotating assemblies into your engine if you have this earlier version of an H22, H23 or F22. BUT you can swap F22 cranks into your early H22 or H23 and have a sleeper stroker!

BORE SIZE:

H22A block = 87mm/3.425
H22A1 block = 87mm/3.425
H22A4 Block = 87mm/3.425
H23A block = 87mm/3.425
H23A1 block = 87mm/3.425
F20A block = 85mm/3.346
F20B block = 85mm/3.346
F22A block = 85mm/3.346
F22B block = 85mm/3.346
F22B1 block = 85mm/3.346
F22B2 block = 85mm/3.346
F23A block = 86mm/3.385

For more information, the holy grail of H&F Series information is on Honda-Tech.com and shoutout to @Hondaccord the user who put together the list. 

*There are other considerations, like which cylinder head you plan on using. I'm gonna keep this one short like most people's attention span. Contact me for details on cylinder head compatibility. 

26 Comments

Hi. From what engine H series (16 valve doch v-tec) can I use head on f22z2 engine block? If it’s impossible.

Posted by Vitas on July 31, 2020

I have a bare h22a block and was carious witch crank would be best for high comp. and if I can use my existing h22a eagle rods and mahle pistons?

Posted by jose m on July 21, 2020

Can you use a f20b head in a h22a4 bottom end?

Posted by Charles Arline on June 15, 2020

I need some help i was wondering f20b vtec on a h23 block possible? I need torque and what problems would i run into

The thing is i have stock f20b motor in my lude right now lacks torque would a fully built f20b head on stock f20b block do anything good?

Posted by Soun Sayarath on May 20, 2020

I want to Sleeve my F20b from 85mm to 87mm. Can I use h22 11.5 comp pistons in this build? I would like to have at least a 11.5 compression

Posted by Chris Wojnarowski on April 22, 2020

I have a fully stock blue top f20b DOHC vtec engine I plan on putting in my 93 cb7 coupe. Tips on what I could do or use to make it a sleeper stroker? Without having to spend big bucks getting it bored n all? Thanks…

Posted by William Atterberry on March 12, 2020

F series do not have closed decks as stated in this thread. As far as I know the h22a is the only one with a closed deck?

Posted by Thomas E. Kurtz IV on October 16, 2019

Can I put a h23 head on a f23a7 short block. If so wat are yalls thoughts about it

Posted by Scottie Teague on September 14, 2019

Курс криптовалюты

Posted by WilliamSporb on June 10, 2019

Hi ks tuned I am thinking of building a g23 build with h22a head would love some help and where to get start I’m new to this h/f series engines cheers.

Posted by Omar Mcdonald on April 25, 2019

Leave a comment




110 N. Gum St. Kennewick, WA 99336 United States 509-585-0900

We Accept...

We Accept Visa We Accept Discover We Accept American Express We Accept Mastercard We Accept PayPal We Accept Google Checkout