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With a core program that brings in all kinds of different candidates, some heads show up looking like this—reason enough to justify why a thorough cleaning takes place before each unit can be properly evaluated. A core charge of $700 is incurred by the customer with the purchase of Fleece’s Street head (the head itself running $1,836.45), but is fully refunded once the unit they’ve sent back passes inspection.
Once a core cylinder head has been stripped, cleaned, and qualified as reusable, the remanufacturing process begins. Here, three pallets of heads (approximately 30 units) are about to begin circulating around Freedom Racing Engines (the machine shop and engine building side of Fleece’s Indianapolis area operation), where they will either be transformed into a Street or Performance version of their former self.
The day we sat in on the machining and assembly process, our guides were the head of Freedom Racing Engines’ Cummins cylinder head program, John Benshoof, and machinist and assembler, Brandon Smith. To initiate the Street head build, Smith placed the usable core head in Freedom’s Haas VF-4SS vertical machining center to be decked. During resurfacing, between 0.003 and 0.005-inches worth of material is removed—a number that varies depending on how untrue the head is to begin with.
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About Diesel World

Diesel World September 2019, When Oils Sucked : Vintage Engines Designed to push Innovation, Cylinder Heads Everything you need to know, And More....