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Speedmaster crankshafts are nitride-hardened
They feature a stout billet aluminum construction and include all mounting hardware
The copper gaskets help even out the flow between the head and header flange to minimize warping
They're designed to be installed with no modifications
This Speedmaster E brake system is step one in upgrading your Ford 9"âÃú rear end to a modern emergency brake system
170 lbs./in. Spring Rate 12" Tall Coil Over Shock Springs - Silver (Pair) Speedmaster crankshafts are nitride-hardenedSpeedmaster coil springs are designed to withstand the high stress levels of modern suspensions. They're manufactured from high quality chrome silicone steel, heat treated and shot peened, and then powdercoated or plated for protection and appearance. Each spring is guaranteed to be within five percent of its advertised rate.
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