Elgin Performance Valve SpringsStyle: Single with DamperOuter O.D.: 1.500"Closed Pressure: 121 @ 1.800"Open Pressure: 298 @ 1.300"Coil Bind: 1.130"Note: Set of 8 (2 sets required per 8 cylinder)
Max Effort Roller Valve SpringsStyle: Dual Outer O.D.: 1.500"Closed Pressure: 170 @ 1.800"Open Pressure: 445 @ 1.250"Coil Bind: 1.040"
PAC 1300 Series Drag Racing Valve SpringsStyle: Dual Outer O.D.: 1.500"Closed Pressure: 250 @ 2.030"Open Pressure: 614 @ 1.250"Coil Bind: 1.180"
Pacaloy Mechanical Roller Springs 1.500 Dia. w/Special Processing 250 @ 2.030614 @ 1.250 1.180
PAC 1300 Series Drag Racing Valve SpringsStyle: Dual Outer O.D.: 1.500"Closed Pressure: 375 @ 2.150"Open Pressure: 1116 @ 1.200" Coil Bind: 1.130"
Dual Springs1.509 Dia. 112 @ 1.900 355 @ 1.2001.175 Coil Bind
Stock Dia. Performance Springs Chev ChryFord 351W/C/M/400
Howards Cams Mechanical Flat Tappet Valve SpringsStyle: Dual with DamperOuter O.D.: 1.514"Closed Pressure: 130 @ 1.875"Open Pressure: 330 @ 1.300"Coil Bind: 1.150"
Howards Cams Electro Polished Performance Valve SpringsStyle: Dual with DamperOuter O.D.: 1.514"Closed Pressure: 130 @ 1.875"Open Pressure: 330 @ 1.300"Coil Bind: 1.150"
Howards Cams Hydraulic Roller Valve SpringsStyle: Dual Outer O.D.: 1.514"Closed Pressure: 145 @ 1.900"Open Pressure: 360 @ 1.300"Coil Bind: 1.270"
Howards Cams Hydraulic Flat Tappet Valve SpringsStyle: Single with DamperOuter O.D.: 1.525"Closed Pressure: 125 @ 1.875"Open Pressure: 350 @ 1.375"Coil Bind: 1.200"