Performer RPM Buick- CNC PORTED These are CNC ported versions of Edelbrock's 60049 cylinder heads for 455 Buick Using customer supplied heads. Your heads are disassembled, fully CNC ported including the chambers, given a competition Valve Job, decked, fully cleaned and reassembled using the dual springs, 10* locks and retainers, ID locators and viton valve stem seals. These heads are custom assembled to work with hydraulic, hydraulic roller or mechanical flat tappet camshafts. 2" Headers recommended |