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The rings will need to be re-seated because the possibility of microscopic rust particles forming is pretty high, so run the motor up to 1,500 rpm for 10-15 minutes so the rings can seat again. After that, you'll want to put the engine under a load, by either driving the car or adding load with a dyno. This will up the cylinder pressure and use it to force the rings against the cylinder walls, seating them even better. After we were confident the rings were good to go, it was time for a pull. The 355ci small-block went from dormant to laying down 433hp at 6,000 and 409 lb-ft at 5,000 in its current configuration. Not bad for small cubes and pump gas!