One thing I do know about the 351 Cleveland with stock rods is that they dont like being turned much above 6500 rpm without breaking. In San Jose, there is a guy who used to build up Clevelands for use in a Sprint Car / Super Modified ( at a time when eveyone used small block Chevrolets ). He used to machine the crank to accept Chevrolet rods and routinely spun it to over 8000 RPM. Granted, these motors were making over 700 horsepower but the rods were a weak point. So, if you are looking for high RPM capability, spend some money in this area. By the way, the Cleveland made far superior power to the Chev. even with only an 850 Holley. It's a great design.
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