Beehive Spring Kit .600 Lift ( SBC/SBF Aftermarket Head)

Beehive spring kit for most aftermarket Sbc and sbf head's with 11/32 valve stems, the kit used a Hat type seal that has a integrated spring seat, you will need to cut the top of the guide to .500 od, a simple process and machine shop can do in just a few minutes,  kit includes,  Pac 1218 springs, Pmi moly retainers,  Hardened Locks, and Viton valve seals, designed for a 1.800 installed height.
Pressure 
130 @1.800
318 @1.200
313 rate