EJ20K heads on a EJ20H block, CAN IT BE DONE?

[gazzy2000]

Hey,

I have heads off a 97 WRX (JDM) EJ20K.... will these bolt straight on a EJ20H block?? (EJ20 will have the 8:1 pistons in it)

ANy further info that i would need to know on this matter wud be appreciated.

Cheers

Gary

[Guest boostin]

Yes, but why? You couldn't really pick a worse block to do it to.

All heads will bolt to all blocks, if you're sticking with 4's. You just need to be wary of required head gasket thicknesses.

[ReubenH]

Same as what i was saying in the IRC. 20H's are open deck, but from the EJ20G era of engines.

I'd either use the opportunity to get a closed deck block, or go for a later rear thrust block as seen on the Phase-II's and up.

[funkytown]

haha spot on eh gazza.. ;D

[Guest]

Perhaps he just wants a cheap engine that goes ?

Cause if you make the case for a better block - whats the point of putting wrx heads on it

[funkytown]

correct qwerty - afaik its going in the BG legacy project he picked for a bit of fun.

nothing fancy pants.

and adding to the argument - why then not forging some of the internals at the same time and so on and so on.

[gazzy2000]

 Qwerty said:

Perhaps he just wants a cheap engine that goes ?

Cause if you make the case for a better block - whats the point of putting wrx heads on it

exactly, thankyou

i have everyone in my ear sayin do this do that, I DONT CARE, LOL

I want a stock engine that goes, yes it will have a VF22 and yellows etc but no big wow factor, all stock. Yes i boost my cars but i dont stay at 8000 RPM for prolonged periods, plus i service them well.

example: If people out there "not in the know" blow their 97-98 WRX /STI engine (which is a K shortie.... same as an H shortie) and simply get the original one rebuilt, they dont complain.... at least not untill the engine is up around 100KMs again, so that generation shorties cant be that bad, specially with someone who looks after their cars.

[Guest]

 funkytown said:

and adding to the argument - why then not forging some of the internals at the same time and so on and so on.

Its a slippery slope

[gazzy2000]

 funkytown said:

correct qwerty - afaik its going in the BG legacy project he picked for a bit of fun.

nothing fancy pants.

and adding to the argument - why then not forging some of the internals at the same time and so on and so on.

yes,

K, moving on then....

question: are actual JDM WRX heads (to clearify, i am talking about the JDM engines, the ones with all STI bolt on goodies, bar the forged internals, VF22 etc) .....do those engines have actual STI heads?

[funkytown]

 Qwerty']

[quote name='funkytown said:

and adding to the argument - why then not forging some of the internals at the same time and so on and so on.

/quote]

Its a slippery slope

dont I we know it

and go get em gazzy - your engine will be fun as in stock form - just get the right HG to match correct compression required

[Guest]

I believe the head castings are the same ? but the cams and internals are not ?

Sti = shim under, thats why they have the higher rev limit.

If they are shim under its a good bet they are the same as sti

[readosnr]

heres some info for you

GC8D, GC8E, GF8D, GF8 E (so "ver 3" and "Ver 4") all have the same BARE heads

this includes the ej20G puss model engine, EJ20k both wrx and sti versions and 22b all have the same heads during V3 and V4 build years. what differs is everything that bolts to them like valves (2 types), cams (3 types), lifters etc

[ReubenH]

Same thing with the blocks too right? You simply have "Phase-I Open deck"? But the pistons, won't they be different?

Will early (94) EJ20H pistons play ball with 20K heads?