Torque Monster !
As far as the seat width goes it was spitballing, I am certainly open to suggestion. One of the best parts about the 413 rv motor is 7/16 stem sodium filled exhaust valves. I have read that 40% or so of the cooling actually happens in the valve stem with the sodium melting and sloshing up and down inside the stem. GM is using sodium valves on the vettes, but they are trouble because the stems are too thin and can break.
