World Products 030620-3 - Cylinder Head Cast Iron Chevy Big Block MERLIN 320cc Rectangle Port 320cc 119cc 26Degree 2.300" x 1.880", Assembly w/ 1.550" springs for solid roller liftersWorld Products 030620 3 Cylinder Head Cast Iron Chevy Big Block MERLIN 320cc Rectangle Port 320cc 119cc 26Degree 2. 300 x 1. 880, Assembly w 1. 550 springs for solid roller lifters Worlds 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 310 & 345cc configurations. Choose the port size that