Dual valve springs with damper
O.D.: 1.550 inch, I.D.: 1.140 inch, Inner Spring I.D.: .738 inch
Seat pressure: 250 lbs. @ 1.900 inch,
Open Pressure: 600 lbs. @ 1.235 inch
Coil Bind: 1.150 inch = .750 inch lift
Max recommended Lift: .700 inch max lift
Good for solid Roller cams. Used internally on all -3 Big Block Head Assemblies
Have been using these springs for 20 plus years. Excellent success rate with these. Have used these springs on All World Products and Bill Mitchell Products BMP cylinder heads for 20 plus years. As the old saying goes “if isn’t broken then don’t fix it”. Of course we recommend that you check your valve spring rates periodically to make sure they are in good health.