Pontiac V8 intakes use a shorter bolt than the Chevrolet pattern most hardware bins are stocked for, and a bolt that is too long will bottom before the manifold seats. This is the correct 1.250 in. grade 5 set with hex heads, so the intake clamps evenly on both banks and stays torqued through heat cycles.

Edelbrock 8559 Manifold Bolt Set Specifications:

• Grade 5 steel bolts, silver finish, hex head drive.
• 3/8 in. thread diameter, coarse thread pitch.
• 1.250 in. length.
• For Pontiac intake manifolds.
• Sold as a set. Torque from the center outward in stages.