Max Torque Big Block

In the case of a motor home, it's going to be more about usable torque than maximum torque, rpm range of idle to 5500 rpm. Stay with stock stroke and rod length just rework the iron 452 heads by the MP templates, polish and unshroud the chambers to minimize detonation, and add hardened exhaust valve seats. Use a set of inverted dome pistons and set the quench for .038 and target no more than 8.9:1 compression (Do you really want to be limited to premium gas in a motor home? Better own stock in Exxon...) Use a Lunati Voodoo 262/268 hydraulic and Edelbrock performer with functional EGR, H.E.I. conversion ignition, F.I. Tech self tuning fuel injection. The best option for exhaust appears to be Hedman ceramic street mid-length headers and three inch duals with Dynomax dual inlet/outlet stainless motor home muffler.