E915046 Erson Single Flat Tappet FSP Valve Springs, 1.255" OD, .830" ID 115#@1.750, 350#@1.175, 1.100 Coil Bind, .600 Max Lift. Excellent Stock Replacement Spring.

E915042 Erson Dual Roller Racing Valve Spring Ideal Valve Spring for Small Block Chevy High Lift,
High RPM, Oval Tack or Drag Race Applications, 1.580 OD, .825 ID, 249#@2.050, 650#@1.270, 1.200 Coil Bind Max Lift .800.

E915403 Erson Dual Roller Racing Valve Spring. 1.580 OD, .832 ID, 235#@1.950, 610#@1.250, 1.170 Coil Bind, Max Lift .730.

Erson E915044 Dual Roller Racing FSP Damper Less Valve Springs, 1.610" OD .842" ID Seat Pressure 235#@2.050", Open Pressure  645#@1.300", Springs 547#, Coil Bind, 1.200",Max Lift .780".

E915160  Erson Dual Roller Racing FSP Damper Less Valve Springs 1.640" OD .860"ID
Seat Pressure 250#@2.00", Open Pressure 803#@1.150", Coil Blend 1.070" Spring 650#
Max Lift .800#. Excellent Drag Race Spring!

E915170 Erson Dual Roller Racing FSP Damper Less Valve Springs, 1.640 OD, .860 ID, 280#@2.100, 794#@1.250, Coil Bind, .900 Max Lift. Excellent Drag Race Spring!

Isky 9985 Gold Strip Tool Room Roller Valve Springs. Dual Style, 1.560"OD .740"ID, Seat Pressure 245#@2.00", Open Pressure 600#@1.300", Coil Bind 1.200", Max Lift .700". 

ISKY 9995 Gold Stripe Tool Room Roller Valve Springs. Dual Style, 1.570"OD .740"ID, Seat Pressure 250#@2.030", Open Pressure 625#@1.300",Coil Blind 1.200" Max Lift .730".