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Old 11-26-2002, 12:49 PM   #1
zaidallas
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Member#: 4106
Join Date: Feb 2001
Location: Expected whp/torque at 25 psi : 450
Default How can you tell if you have phase I or phase II block ?

Other than the year it came from , is there and ID on the block to tell you ?
Also does anyone know if heads from a 99 2.5rs will work with an ej22t block with no mod ? I know it'll work but not sure if different years need different work .

zaidoun
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Old 11-26-2002, 01:03 PM   #2
8Complex

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There are a few things to look for. Assuming that you have a full shortblock, take a look at the pistons... if it is 4 crescent shaped indentations instead of a large squarish one, it is nearly 100% a pII block as there weren't any high compression (10:1) pI motors AFAIK.

There are another few signs... if it has two trans studs instead of just one, it is most likely a pII. If you have it apart and measure the rod journals on the crank, and they are 52mm, not 48mm, it is a pII. Also, if you have it open, a quick look to where the thrust bearing is can tell you... if it's in the middle, it's a pI, on the very back journal, a pII.
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Old 11-26-2002, 01:57 PM   #3
zaidallas
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well the block doesn't have the stock internals anymore and is assembled and in the car . By two transmision studs do you mean how many are sticking out of the block as opposed to how many you screw into the block ?

thanks 8

zaidoun
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Old 11-26-2002, 03:27 PM   #4
paulnose
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Well, I might be able to help you, if the block you have came off another impreza, I can give you all the information about it. Just get the 5 or 6 digit number that is right behind the number four cylinder on the top side of the block. It is stamped onto the block where it meets the transmission housing.

If the motor came from an impreza I can tell you what month it was produced, which would be a key to discovering it's phase. I could also tell you the VIN number of the donor vehicle.

Hope I can help, if you aren't sure if it came from an impreza, or know it didn't I will be able to give you the approximate time frame that subaru was putting out the production number range that your engine falls into. I have a 60+ page document crossreferencing all of the Impreza motors to their body/production number (which combined is the VIN) from 93-2000 sorry 2001 guys

-Paul
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Old 11-26-2002, 04:17 PM   #5
rhdude
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umm... my phase1 block had 2 tranny studs, so don't go by those numbers!
you need to get that code of the rear of the motor to tell.
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Old 11-26-2002, 04:34 PM   #6
8Complex

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Yeah, that is why I said most likely.

You can't even tell by production date cause they mixed them up quite a bit.

Really, the only way to truely tell is looking at the crank journals and thrust bearing.
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Old 11-26-2002, 05:51 PM   #7
zaidallas
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hey thanks for all the help guys.
paulnose : the number is 566275

thanks
zaidoun
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Old 11-26-2002, 07:04 PM   #8
paulnose
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Silverthorn

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Doesn't look like it matches up in the Impreza's, but my eyes are going cross from looking at all the numbers, it's a grid of 500 6 digit number, one line of production codes, the other line of engine codes, a real eye sore to look at, but I can tell you this much...

Subaru was putting out motors in the 560,000 + range from the 3rd month of 99 and on. but like 8 complex said the numbers are all over the place. i have a phase II with a 343,000 number, so since i couldn't find an exact match, cause i just finished looking thuroughly now, it definitely isn't a phase I block out of an impreza, but it could be from another of subaru's lines.

-Paul
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