Traditional Evolution
It loses weight in length, as it's 2.3-inches long versus the factory 2.5-inch length. Sherman will also run lightweight (32g) JE rings in 1.2 mm(top), 1.2mm (second) and 1.5mm (oil) thicknesses. These are thin and light compared to what we're used to and will produce much less friction. Once the piston combination has been finish-machined, they will be coated by Calico Coatings (888-236-6079) with a thermal barrier on top (Calico's CT-2) and a friction reducing coating on the skirts (Calico's CT-3).
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