Rock Solid - Better stability allows use of more aggressive camshafts. Designed for up to 550 lbs of spring pressure. Fits rectangle port design GM LS cylinder heads (LS3/L92) found on Camaros, Corvettes and 6.2 trucks. No Installation Surprises - Bolts into factory rocker stand and clears stock height valve covers. Ready to Go - Fully assembled with proven stock rocker bodies. Hardware included. Durability Comes Standard - Plasma nitride finish minimizes friction and increases durability