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Old 08-15-2003, 08:09 PM   #1
Scooby Specialist
Member#: 3792
Join Date: Jan 2001
2002 6MT almost GDB

Question EJ257 block with EJ207 heads. Mas redline?

I am thinking of making a frankenstien EJ motor. Slapping some EJ207 heads on a EJ257 motor.

Anybody know the CR of this badboy, and how about the max RPM's of the bottom end. Would like to run her up to 8 grand like the EJ207 if possible.

Plan on mating this setup to a FP20G turbo and maxim works headers.

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Old 08-16-2003, 03:34 AM   #2
Scooby Newbie
Member#: 23826
Join Date: Sep 2002
Location: Buffalo Grove
2002 impreza
No color it is invisible.


bump. I wounder what our new US STI short blocks can actually take.
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Old 08-16-2003, 10:43 AM   #3
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Member#: 7321
Join Date: Jun 2001
Chapter/Region: NESIC
Location: waltham, ma
.... 122 IggPoints
Work... ahhh... so tired.


They spin the ra 207 block to 9k right? I know the rev limit from the factory is 8400. From what Ive read the only problem is there is no knock corection after 5500-5800? So you could run into big problems.
You could just slap them up and run it but I dont think it would be a good idea to try it unless you have the money for a new 257 and an extra set of heads. Cobbs ej25 spins to 8k but I dont think the factory block will. Make sure you get the spec c ra heads they have bigger ports then the sti.
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Old 08-16-2003, 04:06 PM   #4
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Join Date: Dec 2000
Location: ContraCosta, Ca
07 STImpreza


De-stroke it and rev it to the moon, I recommend the current STI EJ20 crank(More oil galleys) But a WRX one will be just as strong but rut a little warmer and ware a little faster.

Destroking it would make it run cooler and more efficiently at those higher RPMs. More power/less ware=Winner. You would also need the appropriete cams(Jun). MHO

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