Dual valve springs with damper
O.D.: 1.640 inch, I.D.: 1.195 inch, Inner Spring I.D.: .850 inch
Seat pressure: 250 lbs. @ 2.000 inch,
Open Pressure: 800 lbs. @ 1.160 inch
Coil Bind: 1.100 inch = .900 inch lift
Max recommended Lift: .850 inch max lift
Good for Large solid roller cams. Used internally on all -4 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.