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The mfg's have bazillions of hours of dyno test time. They probably explored the minimum gap limits then backed off just a smidge to allow for all the assembly variables out in the real world. No doubt they've also tested leakage at about all possible gaps and combinations. IMHO a person could go under the recommended minimum but not by much and also keeping in mind how hard the engine is loaded and how hot it might get i.e. if I was building a highly loaded engine I'd consider staying in spec.
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