[ride_the_pony69]

Can I put a standard size wiesco pistons in my brand new stock shortblock without and problems? I would like to do that and keep the stock rods and also change the rod bearings. Just something I want to try out since I hear the weakest link the the EJ257 is the hyper cast pistons and rod bearings.

[JDM-STI]

I thought about just replacing my pistons and bearings also. I don't really need a super built block. I just want something that will hold up to my current WHP levels. (500+/-) I thought a "stock" replacement forged piston would be a fairly affordable way to go without doing a full short block build.

[RainMaker]

Drop-in pistons are unlikely to work well.

There is some variance hole-to-hole in the subaru block. Subaru gets around this nicely with pistons that vary slightly too. Imagine A guy measuring X and then looking at a huge selection of pistons of all different measured sizes. He chooses the exact right size for X. Next hole is Y, he can select that best piston. Subaru can do this with bearings, pistons, etc. because they make many engines on a assembly line.

Id we, on the other hand, order our "best guess" and all 4 cylinders the same, the likelyhood of some piston wobble or piston slap is relatively high.

*IF*, however, the block is removed and the bores are all redone to a nice amount with an "experienced" block that wont core shift, you can of course use 4 similar pistons. But they will be bigger than "stock".

[ride_the_pony69]

so you don't think it's a good idea to do that?

[JDM-STI]

Originally Posted by RainMaker

Drop-in pistons are unlikely to work well.

There is some variance hole-to-hole in the subaru block. Subaru gets around this nicely with pistons that vary slightly too. Imagine A guy measuring X and then looking at a huge selection of pistons of all different measured sizes. He chooses the exact right size for X. Next hole is Y, he can select that best piston. Subaru can do this with bearings, pistons, etc. because they make many engines on a assembly line.

Id we, on the other hand, order our "best guess" and all 4 cylinders the same, the likelyhood of some piston wobble or piston slap is relatively high.

*IF*, however, the block is removed and the bores are all redone to a nice amount with an "experienced" block that wont core shift, you can of course use 4 similar pistons. But they will be bigger than "stock".

Understood. Just looking for a non-$4000+ way to make my set up safer. I actually don't "want" to spend anywhere near that. But, I'll do what I have to I guess.

[RainMaker]

Originally Posted by ride_the_pony69

so you don't think it's a good idea to do that?

no... sorry. Not alot of cheap ways to safeguard 500hp.