I agree with 53moneypit. These things were built to run 3,000+ all day long. If you want to put them under load at 2k like modern engines, you will be lugging them. This is especially important with splash oil rods. They depend entirely in hydrodynamic lubrication because there is no oil pressure at the rod bearings and hydrodynamic lubrication requires speed. Just because the old engines make a lot of noise with steel fans and solid lifters doesn't mean that they are going to come apart. Horror stories of splash engines throwing a rod usually starts with an engine that has been lugged and develops bearing clearance. And then with this excessive bearing clearance, it throws a rod when it is revved up.