World Products 030630-2 - Cylinder Head Cast Iron Chevy Big Block MERLIN 345cc Rectangle Port 345cc 119cc 26Degree 2.300" x 1.880", Assembly w/ 1.550" springs for solid flat tappet or hyd.roller liftersWorld Products 030630 2 Cylinder Head Cast Iron Chevy Big Block MERLIN 345cc Rectangle Port 345cc 119cc 26Degree 2. 300 x 1. 880, Assembly w 1. 550 springs for solid flat tappet or hyd. 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