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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!


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 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. 


Hi i have f23 and i would like to destroke the engine. Will the piston from h fit f serie 86mm how that work and h 87mm thank you

Posted by Frank on January 14, 2019

Nevermind that thanks dude

Posted by Travis on November 20, 2018

would my jdm f22b dohc head work on a F22B2 block

Posted by Travis on November 19, 2018

I have one Honda accord 1998 F18A3 116hp engine. (Europe)

I bought an older Honda accord this weekend from 1992 F22A3 150hp. I have not decided yet what to do with this old car.
I have been thinking about to swap this engine to the newer car.

The Engine however F22A3, i want to tune it up further.
Possible to put a Dohc head on this block??
If yes, from which engine will it fit and what modifications has to be done. Can this older car be chipped to gain more power :) ?


Posted by Jonas on October 30, 2018

Will f23a1 balance shaft fit in f22b1 block

Posted by jeffeey on October 11, 2018

I run F20B SOHC HEAD, I want to put F20B DOHC HEAD on it, is it posible?

Posted by Jude on September 18, 2018

So I have an early h22a block that has been sleeved, but the crank is trashed. I also have a dohc f20b 55mm crank, can I turn the mains down to 50mm so that I can put it in the early h22a block and make a destroker h22

Posted by Scotty on September 01, 2018

Good to know all these information’s. Very helpful but are all the h&f series have the same starter motor ? Which starter motor is a direct fit for the H22a engine ?

Posted by Timothy on August 03, 2018

I have a h23A with h22a (PDE HF-1) Head. Was wondering what bearings I use? Can I use the h22a4 bearings ?

Posted by Severo Gutierrez on June 10, 2018

Would my h22a4 eagle Rods fit my H23a blue top?

Posted by Jose on April 20, 2018

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