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I’m selling a brand new set of Frankenstein Engine Dynamics M311 LS3/LSA BOOST Monster Cylinder Heads. They are engineered and machined by FED in the USA. 6 Bolt Heads, 0.750″ Deck Structure, OEM/Factory Style Water Crossover Ports, 7/16″ Stud Size For Main 10 Bolts, 8mm Stud Size For Outer Tabs...