H22a4 / H22a5 blocks, any difference in headgasket? - Honda Prelude Forum

Rasmusm · 06-19-2011, 09:11 AM

Hey

Im about to change my block in my 4th gen.
My h22a2 block cracked in a coolantline below the header >,<

Anyways, Im not sure what block im going to get, it will be the one I can get my hands on could be a4 or the a5 not sure yet.

But Im about to order alot of stuff I need for the swap.. Such as headgasket and stuff. Just wondering if theres any difference in the headgasket from h22a4 -> h22a5 ?

Thanks!

Best regards Rasmus Mikkelsen
Denmark

minilogoguy18 · 06-19-2011, 11:52 AM

All depends on if it's the open deck or closed deck, H22a4 is open deck, if the H22a5 is too then that gasket will work just fine.

Rasmusm · 06-19-2011, 12:13 PM

Okay thanks, I believe honda changed the design of the block (h22a1+h22a2) to the opendeck version because of this. I have a friend with similar problem on the A2 block -,- he swapped engine instead.

The h22a5 is just the EU version of 97 h22 prelude, A4 is US version.
As the A1 is us version and A2 Eu block.

minilogoguy18 · 06-19-2011, 07:24 PM

Well then it should work since all 5g blocks were all open deck, I'd try to find a closed deck block, known to be more durable. Most manufacturers went do open deck mainly because it's cheaper to manufacture, less aluminum is needed.

Rasmusm · 06-20-2011, 01:26 AM

yea but all closed deck are known to crack the same spot.. Both me and my friend have experienced it on the h22a2 / closed deck block, the exact same spot.. I cba with that anymore

TypeT · 07-07-2011, 03:42 AM

a4 USDM
a5 EDM

they have different compression ration & gearbox and because of those different ecus. everything else are the same. I have a4's headgasket in my a5