mct3351

Lots of misleading information.
Your ring lands are cracked. Both the one between the first compression ring and the one between the second compression ring and the oil rings. If there was a hole in a piston your compression in the failed cylider would be 0 psi. I am almost certian the rings themselfs will look fine. This was caused by excessive knock/detenation that could have been caused by a number of things. The cracked ring land will most likely be on the intake side.

You absolutly can NOT oversize a bore without an oversized piston, your piston to bore clearance would greatly exceed the limit. Your only option from the OEM oversize perspective is a one time 0.20mm (.0079in) oversize. This will also require an "oversize" ring set.

Do NOT have the head or the block resurfaced if it is not needed (ie. check with a straight edge per OEM FSM). You can not put that material back on in the future. FYI the OEM limit is a COMBINED 0.008in from the head and block. If more is removed this will require a thicker than stock (1.1mm) headgasket to keep the compression ratio down (stock ratio 8.5:1). You would not believe how fast the compression ratio rises as material is removed from the head and block. Also if you remove more than the OEM limit it will alter how tight the "squish area" is and the rest of the combustion chamber geometry and it will alter the cam timing since the cams are closer to the crank shaft. If the engine has never seen excessively high water temps and is not warped of scored/gouged a resurface is not needed. NOTE: When cleaning off the stock gasket make sure to not gouge/scratch/score the mating surfaces of the block and head.

My advise, if you choose the rebuild option, would be to disassemble the engine to gain access to the failed piston. Replace the failed piston ($50) with the size stamped on the deck. Put new rings in it ($105 for all 4 cyliders). Have a machine shop lightly hone at least the poped cylider to remove any aluminum deposits from the "floating ring land pieces". You shouldnt need to bore it out. You'll likely see light "scoring" in the cylider that can NOT be felt with you finger nail and that should be taken care of with the hone. Put new OEM bearings in it according to the sizes indicated by the markings on the block and crank (~$110 for rod and mains). Buy the complete OEM gasket kit ($124). Replace the head gasket with an OEM one if you never intend to take it apart again and dont resurface anything. Buy an Apexi if you plan on a "built" rebuild in the future because the stock headgasket is a pain to remove (leaves behind gasket material on the head and block that is a pain to remove) or remove more than the OEM limit resurfacing a warped head/block. There will be no performance advantage to an Apexi HG at sub 400hp numbers. In all likelyhood all tolerances in the engine are within the limits of the manual as long as the motor was decently taken care of. You'll have around $400 in parts(w/o shipping) plus what the machine shop charges for the hone into it and it will be in better shape than it was in before the ring lands broke.

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