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Old 04-02-2006, 08:13 PM   #1
Scooby Newbie
Member#: 52632
Join Date: Jan 2004
Chapter/Region: South East
Location: Douglasville, GA
1998 impreza rs

Default ej25t

has anyone done the gc8 2.5rs engine mix. putting the sti short block and stock rs heads together? and turbo charged it? i have questions of matching the parts.
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Old 04-02-2006, 08:22 PM   #2
Scooby Newbie
Member#: 44425
Join Date: Sep 2003
Chapter/Region: South East
Location: Knoxville TN
2004 Impreza WRX


A lot of people think that non-turbo heads are actually work better then turbo heads. I think they will be fine if you change the valve springs...ect. Maybe someone can give more info as to why they are better.
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Old 04-02-2006, 09:05 PM   #3
Scooby Newbie
Member#: 53595
Join Date: Jan 2004
Chapter/Region: NWIC
Location: nowehres
1987 GL Hatch
EA81 1.6L + Weber


the block mates up the same and will work fine. but you might want to invest in pistons with a dish designed for that head. they also have a rod/piston combo at crawford that would swap into your stock EJ25 n/a block. but you wouldn't really be able to get the same performance capability as the EJ257 block as yours is not semi closed deck... BUT, it is an option.
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Old 04-02-2006, 11:16 PM   #4
Scooby Newbie
Member#: 98262
Join Date: Oct 2005
Location: Weed, CA
1999 impreza 2.5rs


I have a 99 2.5rs with a FAT stage 1 kit on it. In a month im getting a sti short block installed along with a new ECU. The guys at xcceleration.com told after the block and the ECU ill be able to get around 350 hp at 15-18psi. Ill let you know what happens. Ill post some pics to!! Good luck though
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Old 04-03-2006, 10:53 AM   #5
Matt Monson
Scooby Guru
Member#: 832
Join Date: Jan 2000
Chapter/Region: RMIC
Location: Teh Ghetto Garage, CO
99 2.5RS, '85 911
'73 914 and 2012 BRZ


It's never been done, ever. Just giving you a hard time. There's a bunch of threads in the proper forum (aftermarket forced induction) about this seet up. It's not a swap, it's an RS-T. Drop a PM to skully. He's in your neck of the woods, and can steer you towards the right people to help you out with this and get it tuned properly...
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