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Going from the 2.2 litre pistons to 2.5 litre pistons is a huge step up. I don't know if the increase is in bore, stroke, or both; but even if it's a little of both, that's still a huge increase in bore. I don't think there's any way to bore the EG33 block that much bigger. Also, will the wrist pin fit? Is it's location correct for the EG33 rod length? Will the dome be clearanced for the EG33 valve configuration? Is the skirt going to interfere with the crank ballance weights or the block internals?
I'm almost certain that no other Subaru uses the same valves as the EG33. The heads on the SVX are totally unique to any other Subaru block. Yes, the bottom end is basically an EJ22 with an extra row of cylinders, but the top end is something else entirely. Custom valves are not difficult to come by, but I tend to think they would not be neccessary.
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