[GsxrMe]

Originally Posted by guybo

These pistons were custom made to have a compression ratio of 12.5:1, bore of 86? I was looking at the Carrillo catalog but these are listed as 10:1 (CPN2-3386)

I'm not sure yet, my engine is still being looked at and we don't know what we need yet (hydrolocked) but when it is put back together I am staying 12.5:1 and once the block is honed I think it'll still be 86mm (assuming the cylinders aren't totally screwed). So I'm keeping this post in my back pocket, I'll know for sure in a week or so.

These are a custom order only at 12.5:1

When I get home tonight I'll post the paperwork in the box.

I ran boost and I planned on a lot of it. I have x beams that thankfully fit in my wrx but these pistons are tough and with the gtx3076r I ran my spool was low at 12.5:1 so they were perfect. My divorce in 2017 set me back on my engine build so they have my waiting. Crappy part is I was about to order a new engine case in 2 weeks and start my build because I'm in a much better place. A local guy with a older frs bought my 2017 aluminum intake I had wait so these are the only thing left I cant use.