200 lbs./in. Spring Rate 12" Tall Coil Over Shock Springs - Black (Pair) Speedmaster billet main caps are

Speedmaster billet main caps are precision CNC-machined from superior-quality 1025 billet steel

measuring 92mm

it has a square bore carb flange instead of a spread bore

O-ring seal is included

If your standard Bowtie block could handle 1500+ HP it would be Speedmaster's H1 engine block

200 lbs./in. Spring Rate 12" Tall Coil Over Shock Springs - Black (Pair) Speedmaster billet main caps areSpeedmaster 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.