World Products 030040 - Cylinder Head Cast Iron Chevy Big Block MERLIN 269cc Oval Port 269cc 119cc 26Degree 2.300" x 1.880", Bare CastingsWorld Products 030040 Cylinder Head Cast Iron Chevy Big Block MERLIN 269cc Oval Port 269cc 119cc 26Degree 2. 300 x 1. 880, Bare Castings World Products MERLIN series has earned a reputation as the performance industry standard for Big Block Chevy power. The cast iron MERLINS are available in both oval and rectangular port designs, with intake ports offered in 269, 320 and 350cc configurations. Choose the port size that will provide the optimum balance