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HELP... What heads are these??
Posted: Thu Aug 07, 2008 9:30 pm
by smh0101
So I bought these heads... thinking they were 1993 WRX ej20g heads....
But they have different valve covers and are shimless cam over bucket heads...
Here are some pics... My friend David said there was no way they were 93 wrx heads.... He thinks they are ej20k heads.
Thoughts? Comments? Questions?
And I'd rather have these style heads... but I'm just curious what they're from.
Posted: Thu Aug 07, 2008 9:38 pm
by smh0101
Oh yeah... they're getting hot tanked today...
Posted: Thu Aug 07, 2008 10:16 pm
by 94SS_Canada
They look like JDM TT ones, maybe?
Posted: Thu Aug 07, 2008 10:34 pm
by smh0101
They only have the turbo supply lines on the passenger side head... so they are single turbo heads.
Posted: Fri Aug 08, 2008 1:30 am
by Matt Monson
Those are '93 WRX heads, as you were told. Those are the right covers.
Pull out a lifter and look under it. You will find the HLA's under there. They are actually attached to the bucket, but they are there.
Posted: Fri Aug 08, 2008 1:48 am
by smh0101
But here are 93 WRX heads...
Totally different looking...
How do I pull out the buckets?
Posted: Fri Aug 08, 2008 2:15 am
by douglas vincent
Magnet.
Posted: Fri Aug 08, 2008 2:16 am
by Matt Monson
No,
That second set is 1993 Legacy turbo Ej20G heads. See the little HLA in the hole off to the side? Those heads have the stub rockers of the 89-93 Legacy heads,
To pull the buckets, just grab one with your fingers and pull it straight out. If that doesn't work, tip it over on it's side. It will fall right out. You will want to remove them before you hot tank them anyways. Otherwise you risk getting water caught in there and having them rust.
Posted: Fri Aug 08, 2008 2:17 am
by smh0101
*Finger Nails*
but they look totally different...
how can they be the same thing... 93 ej20g WRX... and 93 ej20g WRX.... yet not be the same...
Posted: Fri Aug 08, 2008 2:22 am
by Matt Monson
They are not the same thing.
One is 1989-1993 Legacy Ej20 heads.
The other is 1993-1996 WRX Ej20 heads.
They are not both Impreza heads. They are two different generations of heads.
Posted: Fri Aug 08, 2008 2:36 am
by smh0101
Posted: Fri Aug 08, 2008 2:37 am
by smh0101
So they are HLAs?
Posted: Fri Aug 08, 2008 2:42 am
by douglas vincent
YUP.
Posted: Fri Aug 08, 2008 2:46 am
by smh0101
Aight...
Thanks guys, I 'preciate the help!
Posted: Fri Aug 08, 2008 2:52 am
by Matt Monson
douglas vincent wrote:YUP.
+1.
If you are still doubting compare the combustion chambers and the angles of the valves relative to the head gasket mating face.
The new set (the WRX set) have a much more relaxed valve angle and a combustion chamber that is a good +/-10cc smaller because the roof doesn't rise as high.
The old set (the Legacy set) has a really steep valve angle and pent roof. It's a giant 57cc combustion chamber.
If you compare the little details you will see that there are significant differences between the heads.
Posted: Fri Aug 08, 2008 3:00 am
by smh0101
Oh okay... Awesome...
So should I be able to pull more power out of the WRX ones?
I'm guessing a higher Comp Ratio than the Legacy heads...
Posted: Fri Aug 08, 2008 3:40 am
by Matt Monson
Yes,
Higher compression ratio. Also, the lifter design is better so you can rev them a little bit higher without issues.
