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Old 10-15-2010, 11:31 AM   #1
Scooby Specialist
Member#: 94268
Join Date: Aug 2005
Chapter/Region: TXIC
Location: Nolanville, TX
1995 JDM STi RA ver2
2010 Exige S240

Default EJ20G (v2 STi RA) options?

Long story short... I need new valves for the EJ20G on my version 2 STi RA (genuine, RHD, from Japan... ~40k miles). Researched and found out that new valve train parts cost an arm and a leg ($100 for each valve stem!). There are a few dents on top of the #1 piston from hitting the "stuck" valve that eventually got bent... but I was told that the piston is okay to run it.

Right now, I'm trying to get a used EJ20G head and replace the one that I have... seems to be the cheapest, but I'm keeping my options open because I know (99%) that I want to build my car down the road, possibly in the next year or so.

If I was to do it now, what are my options? I was reading up and I a lot of people were saying to go with EJ25 block and mate it with EJ20G heads since the EJ25 block is cheaper and will give more torque... downside of this is 1) it will no longer be 'JDM' and 2) It's not a closed deck block

Any opinions? I'm not sure if Frankenstein motor would be my choice if my goal is to have a clean, JDM looking car... but my goal down the road is ~400whp on HTA green... Not sure what the options are for building the EJ20G and keep it 2.0L I guess there were other options such as 2.2L and 2.3L?
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Old 10-19-2010, 11:04 AM   #2
Scooby Specialist
Member#: 51480
Join Date: Dec 2003
Chapter/Region: International
Location: The Netherlands
1984 AM5, 1984 AF1,
1994 BC4, 2015 Outback


Note that stock EJ20G heads are completely different to RA heads, you would have to swap both.

The RA pistons are forged but the rods are stock crappy ones, maybe time for a complete rebuild? You can also use later EJ20G/K heads and convert to shimless buckets (EZ30R engines) if you want to rev.
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