Empire Elite Barra are made of the highest quality billet 4340 material and heat treated, these head stud washers are designed to cover the area of the head stud that is a standard 23mm to 28mm. This is a perfect upgrade for your engine when you are replacing head studs because the washers provided are often adequate and so once cylinder pressures are increased with more power or detonation, the aluminium may result in a mushroom over the washer which reduces the fasteners preload and therefore its clamping capacity.
This will allow a better clamping force and cover the fastening surface area to apply more boost and be able to push that Barra to another level, and making your engine much, much stronger.
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