MERLIN III RECTANGULAR PORT

Cast Iron Heads
Big Block Chevrolet

When larger displacement engines (454 plus cubic inches) require additional flow, choose Merlin Rectangular Port cylinder heads. With RightCast® 320cc and 345cc intake runners, you can expect solid gains in air/fuel mixture combustion charges. These heads will really respond to higher compression ratios, and are ideally suited for hot street/strip cars. The larger heads with 345cc intake ports are used successfully on Merlin crate motors with up to 632 cubic inches displacement and can support nearly 800 HP in box stock mode!