Overview Each manifold is precision fixtured and welded for a perfect fit and maximum structural integrity. They are ready to bolt on out of the box and offered in a single or dual 4150 or 4500 carb flange. | Holley Sniper Fabricated Manifolds continue to push the aftermarket by introducing intakes for Big Block Chevy Engines. These Intakes are good looking, perform well, and offer an extremely good value for a performance sheet metal style intake manifold. Not Compatible with Large Cap HEI Distributors Features Fits standard deck height blocks 3mm (1/8") thick T6061 Sheet Aluminum construction, strong and durable for high horsepower and boosted conditions Equal runner lengths designed to increase velocity and more evenly distribute airflow to all 8 cylinders 100% TIG welded (laser engraved Sniper logo) Expanded Designs to accommodate (1 or 2 x 4150) & (1 or 2 x 4500) carbureted applications. Choice of bright silver or black anodized finish