LS intake manifolds use a smaller metric fastener than the older small-block, and the bolts also carry the manifold against a rubber-style port seal rather than a crush gasket, so length and consistent torque matter for an even seal. This is the hex head grade 5 set cut to 1.771 in. for the LS series manifolds.

Edelbrock 8515 Manifold Bolt Set Specifications:

• Grade 5 steel bolts, silver finish, hex head drive.
• 0.236 in. thread diameter, coarse thread pitch.
• 1.771 in. length.
• For Chevrolet LS series intake manifolds, including 7118, 2908, 29085 and 28097 castings.
• Sold as a set. Torque evenly in sequence so the port seals compress uniformly.