Yes they are on a 400, no chamber work .Just pocket porting. SS valves and better springs and keepers.
After calculating out the set up with std flat top pistons with the 4 eyebrows which added up to +6cc the CR was going to be too high. so i calulated out what i needed for a dish in the piston and had the machined dishes. i wanted 9.5 to 1 9.75 to 1 max. I called TRW and they recommneded the piston and machine size needed. so they are forged TRW with teflon coated skirts .030 over bore.
The rad is bolted in such a way no air can get around it.
I do have the 400 top close out panels. i dont have the chin scoop.