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For an engine build to work effectively, everything has to fit and function smoothly, which calls for a mock-up before final assembly. Marvin McAfee of MCE Engines demonstrates his strict discipline by doing a mock-up of every engine he builds, including stockers. Mock-ups, although time consuming, can save plenty in wasted time and money. A mock-up shows you what fits and what doesn’t right down to valve-to-piston clearances, and what changes need to be made.