Isky Cams RAD-9000 Precision Tool Room Dual Valve Springs w/ Damper - (Set of 16) - Outer: 1.600" O.D., 1.150 I.D. - Inner: 1.040" O.D., .745" I.D. H753C4452 The 9" reversible Tornado fan

The 9" reversible Tornado fan uses 8 straight blades

system features a 409S stainless steel mandrel bent tailpipe with a 3

This is a tremendous new feature for truck owners

They're quiet

Includes nitrous bosses

Isky Cams RAD-9000 Precision Tool Room Dual Valve Springs w/ Damper - (Set of 16) - Outer: 1.600" O.D., 1.150 I.D. - Inner: 1.040" O.D., .745" I.D. H753C4452 The 9" reversible Tornado fanIsky RAD 9000 Precision Tool Room Valve Spring taken one step further. Springs have undergone Radial Densification (RAD), which further modifies the springs' physical properties. Designed for endurance oval track racing, RAD 9000 springs are sold in sets of 16. Isky RAD 9000 Precision Tool Room Dual Valve Springs w Damper Outer: 1. 600" O. D. 1. 150 I. D. Inner: 1. 040" O. D. . 745" I. D. Seat Pressure 250 @ 2. 050" Open Pressure: 735 @ 1. 250" Rate