Attaching a photo of 4 different EJ25 Piston options we have here at the shop. All of them would obviously have their benefits and are doable but wondering what compression ratios these would make with 1996 EJ22 Single port heads that the owner of the car has available to him and an accompanying harness and intake manifold make that choice rather easy. We could switch to dual port heads and swap the front of the ypipe but would rather not as a cost measure.
1997 EJ25 D single dot
2004 Subaru Baja Turbo (ej255 I believe)
2004 Ej253 2 dot (sohc piston)
I could also go for a 2006 Ej25 sohc piston set we have around here that looks even higher compression visually to me than the 2004 model.
Does anybody know what the compression of the engine would be with these types of pistons? Fuel requirements at altitude?
The engine will be going into a 1984 Subaru Brat with a dual range ea trans so keeping the power reasonable is necessary with the clutch/trans.