Design Drafter / Racer
So, I like the idea of an open 420 torque monster. What's the cost to build a mild open, and what target RPM for survival? I was thinking a "budget open" build, medium aggressive cam, bigger valves and seats, mild port and polish, small flywheel, on gas. I figure 6500 rpm to live? What are the costs for a critter like this? And other than weight, any cons? Pros? GX390 better? I hear the built 305s snap cranks....not my cup of tea. Haven't seen much discussion on industrial open builds. What say you?