Elgin Performance Valve Springs
Style: Single with Damper
Outer 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 Springs
Style: 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 Springs
Style: 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 @ 2.030
614 @ 1.250
1.180

Racing Springs
1300 Series 
1.500 OD
2.150 Install Height 
0.950 Lift
780 Rate
1.130 Coil Bind
Set of 16

Dual Springs
1.509 Dia.
112 @ 1.900
355 @ 1.200
1.175 Coil Bind

Stock Dia.
Performance Springs
Chev
Chry
Ford 351W/C/M/400

Howards Cams Mechanical Flat Tappet Valve Springs
Style: Dual with Damper
Outer O.D.: 1.514"
Closed Pressure: 130 @ 1.875"
Open Pressure: 330 @ 1.300"
Coil Bind: 1.150"

Howards Cams Electro Polished Performance Valve Springs
Style: Dual with Damper
Outer O.D.: 1.514"
Closed Pressure: 130 @ 1.875"
Open Pressure: 330 @ 1.300"
Coil Bind: 1.150"

Howards Cams Hydraulic Roller Valve Springs
Style: 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 Springs
Style: Single with Damper
Outer O.D.: 1.525"
Closed Pressure: 125 @ 1.875"
Open Pressure: 350 @ 1.375"
Coil Bind: 1.200"