Valve Spring Set Isky Racing Dual 240Z 260Z 280Z 280ZXIsky racing dual valve spring set for Datsun 240Z, 260Z, 280Z and 280ZX, 1970 83. Chrome silicon dual springs, made in the USA. Set of 12 for 6 cylinder engines. Excellent spring for use with high performance aftermarket cams such as the Isky or Comp. Requires retainer PT# 800 1373. 1. 7 installed height, 130#'s seat pressure, 280 # spring rate, 1. 34" O. D., . 748" I. D. * High Zinc Phosphorous (ZDDP) oil is required when running these springs. See
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Valve Spring Set Isky Racing Dual 240Z 260Z 280Z 280ZX