VALVE SPRING RETAINERS 3/8" +.075" :: HUG-1256

Contains 16 Individual Pieces: 3/8" Stem Adds +.075" Height.  All valve spring retainers are machined from 4140 chromoly steel and then hardened for extra strength. They are then black oxide coated for rust protection.
Replaces OEM Retainer

Valve stem size Dimension Part Number A B C   7° Lock angle 8mm (0.314") 1.375" - - 1278 11/32" 1.375" 1.035" 0.700" 1201 11/32" 1.375" 1.060" 0.700" 1202* 11/32" 1.370" 1.065" 0.700" 1203 11/32" 1.370" 1.060" 0.700" 1205 3/8" 1.375" 1.025" 0.700" 1252** 3/8" 1.375" 1.060" 0.700" 1254 3/8" 1.375" 1.130" 0.730" 1256*** 3/8" 1.375" 1.130" 0.730" 1258 * Same as Edelbrock OEM ** Generally Used w/Double Spring *** Used with Single Spring 10° Lock angle (For use with Jumbo style locks only) 5/16", 11/32", 3/8" 1.400" 1.050" 0.690" 1270 5/16", 11/32", 3/8" 1.500" 1.095" 0.710" 1272 Tech Notes: The change in installed height listed above tells you approximately how much the installed spring height will be affected by using the listed retainer vs. an average of several stock retainers. Valve spring retainers do not need to be the same diameter as the valve spring used. The retainer OD should be approximately 1/8" smaller than the OD of the valve spring. The retainer should also fit easily onto the valve spring, but not so loosely that the retainer is sloppy on the spring. When using a retainer that offers more installed height than normal, make sure there is a minimum of 0.010" clearance between the rocker arm and the retainer when the valve is in the closed position. 7° vs. 10° locks. We do not recommend 10° locks unless you are using extremely high valve spring pressures (such as 650lbs or more open pressure). The colleting action (clamping) of 7° is much tighter than the 10°. If you should encounter valve float, 10° locks will unlock much easier than 7° locks.