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Old 10-07-2019, 10:50 AM   #1
ej22twagon
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Default Closed deck ej20 ej205 heads

I have an 03 sonic yellow wrx wagon with as much power as I can make before building the block so that's what I'm doing. You can check it out here @20gbugeye https://www.instagram.com/p/B3UfvaMgnpF/?igshid=duefon7ryc0x
This is my first built motor build.
I've seen a few threads about ej205 heads on ej20g blocks. I can have the machine shop make any needed adjustments to make the block/heads match. I want to use these parts since machine work is a lot cheaper than another block/crank/rods. The motor lost a rod bearing before I got it so I had a machine shop go through the motor deck the block grind the crank and rods. The crank and rods are forged but the pistons are not. Machine shop said I can reuse the stock pistons just get new rings all they did was ball hone the cylinders.
I am reading/studying as much as I can but help is alway appreciated!

Suggestions for bearings for an ej20g block? The machine shop said I will need oversize for the rods to crank but standard bearings from the crank to block

Suggestions for which pistons to go with. Standard size or have the block bored for larger pistons. My goal is to get the most power I can from my cobb 20g8cm2 for my daily driver and run more than 19psi. Not looking to make 800hp just make it reliable with the 20g at around 400ish wheel.

Suggestions on mating the ej20g block to the ej205 heads any other machine shop work i should have done to make it more reliable when using my 20g to it's full potential.

I will be building a spare set of heads after I finish the block but that's for later. It will take me a few months to save $ to finish the block.
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Old 10-07-2019, 04:18 PM   #2
subaru_gc8
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you might want to post in the pre 2002 section as there probably is more info on this than there is in this forum. but why would you want such an old block? why not spend the money and get a 207 and start with better flowing heads and avcs? the 205 heads are pretty dismal and they need lots of porting just to get them up to 207 specs. Plus AVCS is king in the power under the curve
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Old 10-07-2019, 08:15 PM   #3
ej22twagon
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Quote:
Originally Posted by subaru_gc8 View Post
you might want to post in the pre 2002 section as there probably is more info on this than there is in this forum. but why would you want such an old block? why not spend the money and get a 207 and start with better flowing heads and avcs? the 205 heads are pretty dismal and they need lots of porting just to get them up to 207 specs. Plus AVCS is king in the power under the curve
It doesnt cost me anything to use the closed deck block and forged parts I have now. This older closed deck block will be better than a 207 open or semi closed block and the only difference in blocks really is the bearing but I'm getting performance bearings ap they should also be just fine. My friend owns a machine shop so the machine work is free. I'm not going for the fastest most powerful car just reliable power from my cobb 20g turbo. I dont need a bunch of power down low. I like the feel of some turbo lag. I live in the country 45min from town and all my driving is in the country. I never do low end 1st or 2nd gear pulls just down shifting to 3rd from 60.

I looked in the pre 2002 turbo forum and saw only one post (I use my phone in mobile version) so it doesnt look like that forum gets many views and it's not all pre 2002 parts. The pistons/rods are the same. The bearing should be similar and just as good as newer ones.
I'm building the car as cheap as possible which a lot of people dont like and suggest newer parts etc but that's all more $ for something I dont need nor want. Injust want a reliable 400-425 and i dont need to spend a lot to get that.
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Old 10-08-2019, 03:38 PM   #4
Fierysun
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2003 EJ207 S204 Wagon

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Unless you plan on pushing way north of 500whp, you won't have issues with the deck. Also, the 2.0L has thicker walls than the 2.5L (which does have deck issues from around 500whp).
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Old 10-09-2019, 10:15 PM   #5
subaru_gc8
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Quote:
Originally Posted by Fierysun View Post
Unless you plan on pushing way north of 500whp, you won't have issues with the deck. Also, the 2.0L has thicker walls than the 2.5L (which does have deck issues from around 500whp).
I think there is a reason why Suaru moved the thrust bearing too. I heard that there was a lot of p[robalmes with the crnak walking with the thrust bearing on #3 and that is why they moved it to #5. also if you really want to have a closed dec block, you can have outfront close deck your block for you.
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