This ultra lightweight 7mm valve/spring/retainer/lock combo is 44% lighter than standard 11/32" stem valves with conventional double springs. Nearly the weight savings of Titanium valves but less than 1/3 the price and increased durability. Due to the reduced mass, you can run much less spring pressure for the same valve control, freeing up HP. These will work in hydraulic and solid flat tappet, solid and hydraulic roller applications. Closed spring pressure can range from 80lbs to 120lbs depending on installed height, and still provide coil bind clearance up to .650" lift. Price includes (8) 7mm stem oversized 1.89 and 1.60" valves, beehive springs, retainers and machined radius groove locks.