Just found this thread yesterday. Here's the specs on a piston I have installed at the moment in an EA82.I installed top and second rings and the inner pin lock. I installed a .065 headgasket and snugged the head bolts down, installed the cam case. Rotated cam both ways, valve interference with that dome. I hand polished the pin bore after knocking out the bushing. I also upgraded the piston pins to a thinner "bearing steel". The piston sits .020 above the deck, I'm not positive how much I took off this block...mabie .006?
I've repeated the camcase to heads off and on a few times. I stacked two headgaskets and bolted it together with no valve to piston interference. Of course, using two of those headgaskets wouldn't work for me. Too much piston to head clearance. Anyway, conclusion, I'd need to have the pistons fly cut for valve clearance. and the piston doesn't fit the combustion chamber. It's adds quench in that trench that circles around them. I can get .040 quench. piston to head, with this piston. That's right where it should be for the piston. Anyway, when I pull it apart again, I'm selling these.
Brand new, unused set of ARIAS Custom Pistons for Subaru EJ20 WRX 2.0 liter, with turbo, supercharger and/or NOS. Fits stock OEM Subaru sleeve bore, no boring required.
Brand: ARIAS PISTONS
Material: Forged 2618 non-silicon
Bore diameter in./mm: 3.622 / 92 (OEM)
Stroke in./mm: 2.953 / 75 (OEM)
Compression ratio: 8.5:1
Crown style: Thermal dish
Compression height: 1.295 in.
Pin diameter: .905 in. (OEM)
Wrist Pin Style: Floating
Pin brand: ARIAS 1018
Ring brand: ARIAS 1.2-1.5-4.0mm
Pin Material: 1018 case hardened
Weight Matched Set: Yes
Quantity: Sold as a set of 4 (pistons, pins, rings, single locks)
These ARIAS pistons were custom made in batches of 40 for a customer who declined the order. The pistons, pins, rings and locks are in new excellent condition. They are precision machined and fitted with a medium-duty pin guaranteed up to 20 pounds boost. Stronger pins are available - please email for an additional quote. This application is not available in the ARIAS catalog as a shelf part number. Comparable sets cost up to $585 on the ARIAS website. Five (5) kits are available.