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11 After assembling and painting our 383, it was time to bolt it up to the Superflow engine dyno at Auto Performance Engines. The dyno is a great way to measure power, and also a very useful tool when making tuning changes or testing new parts. Using a factory electronic distributor and a 750-cfm shop carburetor, we fired the engine and performed the camshaft break-in procedure. Applying a slight load with the dyno servo during break in helps seat the rings, and since we didn't encounter any problems during break in we changed the oil, checked valve lash, and were ready to make a pull.