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Engine Pro Beehive Valve spring kit.
A great reliable addition to a variety of LS performance cams Up to 620 lift
Suits LS1 LS2 LS3 L98 L76 L77 ETC
Max lift 620"
Beehive Valve spring kit with retainers, Seals and collets
Made in the United Kingdom
Installed load and height 135LBS @ 1.800 inches
Open Load and height 330LBS @1.150 inches
Spring rate 300
Coil bind 1.110 inches
Material Chrome Silicone Vanadium Nickel
Havent ran them yet but the hardware looks great, from research they are a UK company making components in house and this set is nitrided just like the gold stand PSI 1511ML.