Exhaust Manifold Dimensions

Hooker Headers 8505-1HKR Blackheart Rear-Dump Cast-Iron LS Swap Exhaust Manifolds for GM Gen III/IV LS Engines [Silver] Features: 

• A 2.5-inch outlet diameter enhances flow for optimal performance in a cast iron exhaust manifold
• Tight tuck design for an exit between standard swap manifolds and center dump manifolds
• Designed for GM LS engine swap applications prioritizing durability, quiet operation, and leak-free sealing
• Constructed from Hi-Silicon-Moly Ductile Iron for durability and corrosion resistance
• Includes hardware: Nickel-plated steel mating flanges, MLS mating flange gaskets, and mating flange hardware

Hooker Headers 8505-1HKR Blackheart Rear-Dump Cast-Iron LS Swap Exhaust Manifolds for GM Gen III/IV LS Engines [Silver] Note:

• Not compatible with 2004-2006 Pontiac GTO starters or bell housings

Emissions Note:

This product is engineered to facilitate the installation of a later model, emissions-friendly engine into a vintage/classic vehicle.

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