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 Mechanical Roller Valve Springs
Dual
1.500
1.116
0.800
170 @ 1.800
445 @ 1.250
480
0.700

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 Mech. Roller Valve Springs
Dual w/Damp
1.539
1.125
1.015
0.731
194 @ 1.920
505 @ 1.200
510
0.720

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 Mech. Roller Valve Springs
Dual w/Damp
1.557
1.143
1.015
0.731
200 @ 1.950
540 @ 1.250
486
0.690

Max Effort Mech. Roller Valve Springs
Dual w/Damp
1.557
1.143
1.033
0.749
225 @ 1.950
555 @ 1.250
471
0.740