im rebuilding my closed deck ej20g out of my 95 wrx ra. im running wiseco k576m925. the new pistons are square dished and the old ones were the dog bone style. the old pistons had much deaper valve pockets, the new ones are just the square dish. am i going to run into clearance issues with the valves?
heres pictures for reference(not my own pictures)
http://i77.photobucket.com/albums/j6.../toppiston.jpg
http://i1008.photobucket.com/albums/...2/DSC03035.jpg

 

Should be ok as IIRC the comp. height of the dog bone pistons is approx. 33.50 mm with a 14cc bowl and the Wisecos will sit lower in relation to the piston deck height.

Mick

 

I've already installed the wisecos. they do come out a little bit above the deck. the wisecos are originally a lower compression ratio but I had them made to 8.5-1. I'm gonna check the piston to valve clearance just to be safe

 

what happen to the piston

 

the original pistons? I was at around 17psi and it finally broke a ring land on cylinder 4. car has around 170000kms