Water Neck Chrome O-Ring Style For SB And BB Chevy Engines 15 Degree Type Chevrolet Performance PartsPremium Chrome Water Neck. This Chevrolet water neck utilizes neoprene O ring gaskets instead of regular gaskets eliminating leakage. Supplied with chrome bolts. Sold as one kit. Product Details: Engine Water Neck O Ring Style No Gaskets For Small Block and Big Block Chevy Engines 90 Degree Type Neck Chrome Plated Finish Made From High Quality Aluminum Hardware Included Officially Licensed GM Performance Parts Product Sold As One Kit