As far as the OS 26 SC car engine. I put a cam and head assembly on my stock .26 FS and installed it on my Dreadnought racer and I have to say it was a lot of fun. I ran it on 50% nitro fuel and it was amazing. Very fast and could keep up with the 32 in the Bearcat. Not much on idle at 4000 rpm but at full throttle it was another scalded dog on step! I'll post pics later. Even got Brian Sanders , the owner of Dreadnought, to fly it and pose with the plane for pics. I sure do miss those days😔