well i emailed arias, and they aren't being very helpful. the only bit i got out of them was "the pistons will have to be custom, 155 dollars per piston". i asked that they forward my email to someone with some technical background with rb30/26 (because the given combustion chamber volume of 64.5cc in this thread was apparently the result of a lot of research), and yet, no reply. help anyone? arias was quite useless. i contacted them regarding what needs to be done to achieve my desired CR, and they told me that i need custom pistons for 155 a pop. No tech specs, nothing. haven't heard from them regarding the interference issues with 9.15 lift or how much i have to deck off the head... NOTHING. can anyone help me?

Another option for you is to use RB25DE pistons, and if u must have 87mm i'm sure u can get them oversized. I cant remember what the comp is with them, i think somewhere around where u want (10.5+)! Could be cheaper too, u don't need forgies for na, even with high comp, u just need a good tune.

I'll be happy to help technically. where I work, we do RB performance engine building jobs all the time and we have some data on the various piston/head/cam combos that work, both turbo and NA. We have been selling/using Mahle motorsport pistons for RB turbos engines recently. Truly beautiful things and much better quality than some others on the market, and for similar prices. Various of their pistons come with coated piston skirts. PM me if you want specific engine help, or just post here any general engine queries and I'll answer them if I can

Quote: Originally Posted by darkstar 1500 to 1800 is a good price for forgies, depending on what you get for it. Friend recently got some rb25 pistons, standard forgies for 1500, might be SPS ones im not sure. Truly an art work, i think that was wtih rings and gudgons, but they were albit incomplete.... needed to cross drill the gudgion pin housing for an oil squirter, but oitherwise great. i got my aries forgies for $1100.00 at trade price from rocket including pins retainers and rings, the rb30-25 head conversion pistons have been avaliable from aries for like over a year and a half when i bought my pistons they were avaliable p.s machining piston crown is not a good idea it destroys your warranty on the pistons because it weakens the crown and brings the top ring closer to the combustion. why not buy the right **** first and stop messing around have a look at rocket http://rocketindustries.com.au/search.php?keyword=rb30 they only have them for 86.5mm bore but i think if you ring them up they probally have them in stock

I've now managed 80,000km's on a set of 87mm RB25 Wiseco pistons with the std ring pack in the rb30det. Still appears to be running well and not using oil; of which has surprised me considering they have always slapped a little first thing in the morning. The RB25 wiseco pistons are not ideal as they sit slightly down the bore. I've had mine decked 0.040"; from memory they still sit down the bore ~0.020". Pitty wiseco don't make something more suitable for the rb30det combination. Some original photos have not been recovered yet.