LS1 LS2 LS3 LS6 LS7 VALLEY COVER BOLT KIT (LOW-PROFILE). Fits GEN III, IV LSX (LS1 LS2 LS3 LS6 LS7) Chevy V8 Engines. The plastic intakes have also been known to crack from lack of clearance. Rogue allen socket head bolt kits are easy to install, more durable and corrosion resistant than OEM, and look exceptional to boot!