Saint Jack
With regard to the Twin Ranger, Bell did in fact manufacture this aircraft from new with the L4 airframe, granted they also used the soloy STC. I'd be interested in how difficult the Twin Ranger is to maintain, I've had a look at it (from an operational point of view), seems to be an L4 with C20r's and a combining gearbox ( Soloy ) and the oil coolers moved forward in front of the hydraulic pack. I also looked at the 427 and think that your suggestion of that very sound.