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

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"

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"

Howards Cams Hydraulic Roller/Mechanical Flat Tappet Valve Springs
Style: Dual
Outer O.D.: 1.470"
Closed Pressure: 110 @ 1.880"
Open Pressure: 350 @ 1.330"
Coil Bind: 1.270"

Pacaloy Mechanical Roller Springs
1.550 Dia
240 @ 1.900 Seat
625 @ 1.200
1.100 Coil Bind

Howards Cams Hydraulic Flat Tappet Valve Springs
Style: Single with Damper
Outer O.D.: 1.550"
Closed Pressure: 145 @ 1.880"
Open Pressure: 350 @ 1.250"
Coil Bind: 1.200"

Electro Polished Performance Valve Springs
1.539
1.125
145 @ 1.880
350 @ 1.250
335
0.670
1.200

Max Effort™ Roller Valve Springs
Style: Dual with Damper
Outer O.D.: 1.500"
Closed Pressure: 190 @ 1.920"
Open Pressure: 505 @ 1.200"
Coil Bind: 1.150"

Howards Cams Hydraulic Roller/Mechanical Flat Tappet Valve Springs
Style: Dual
Outer O.D.: 1.500"
Closed Pressure: 145 @ 1.940"
Open Pressure: 425 @ 1.250"
Coil Bind: 1.100"

Max Effort™ Roller Valve Springs
Style: Dual with Damper
Outer O.D.: 1.557"
Closed Pressure: 224 @ 1.900"
Open Pressure: 540 @ 1.250"
Coil Bind: 1.150"

Max Effort™ Roller Valve Springs
Style: Dual with Damper
Outer O.D.: 1.557"
Closed Pressure: 225 @ 1.950"
Open Pressure: 555 @ 1.250"
Coil Bind: 1.150"