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These heavy-duty spring assemblies are made of aircraft quality steel and recommended for big block competition engines. The outer coil diameter is 1.538". The spring yields 128 pounds seat pressure at an installed height of 1.90", and this spring coil binds at 1.26". It's rated at 330 pounds/inch. This kit includes 16 springs of P/N 3989354, and use P/N 3989354 for single spring replacement. Use steel retainer P/N 3989353. This spring requires a small diameter aftermarket PC-type valve stem seal.
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