In one of Pat 'Bogie' Bogart motors I built for him is a Lamey P.V. 5mm stroker X 88 mm seadoo 951 piston = 888 cc's. Lamey sleeves are maxed out at this size and will need to resleeve when needing a rebuild. We had to custom CNC the ADA yamaha head to fit the 951 type domes (also had to make custom domes too as the 951 ADA domes have the o-ring groove to far out and won't seal on the lamey block)
I haven't bought any... but I see that R&D has up to 86.5 pistons listed on their website. The dis-avantage to this big bore is you cant use ADA head with their domes as the o-ring will be in the bore...Must use the R&D head and domes for this big of bore. Phil at CrankWorks builds all the stroker cranks now...8-10 mm cranks are all 133 mm long rods. The motor I'm working now will be a Lamey P.V. 8mm stroker x 88 mm bore/special custom flattops = 924cc's.
Another Lamey that's in the works is a P.V. 5mm stroker/85mm flattop = 828cc's
I am running 86mm R&D pistons in my dominator flattop, I had the domes cut by Speedwerx to 86.5mm 26.5cc so that I dont have to buy them again for the next bore. The Speedworx, UMI, cool head and Quite a few other heads work fine at 86.5mm as they all use same domes, You may me right about ADA domes, but I have found my Speedwerx head works as good as ADA and Ideally should cool better than ADA domes. The lamey sleaves are definateley more flexible on what pistons you can use due to ring pin location than the R&D sleaves, I would not try SeaDoo or Kawi pistons in the R&D, kinda stuck w/ R&D pistons only.
The motors your building aught to be some friggin arm stretchers fo sho.
Anyone try ADA's new big bore cylender yet?