Engine Cylinder Headuse recommended springs to match your camshaft Exhaust flange is extended . 300" from stock (same as Mopar Stage 6) featuring dry exhaust bolt holes with Heli Coil thread inserts Max Wedge intake ports are machined to match intake manifolds for B and RB competition big block Chryslers 72cc combustion chamber volume Cylinder head part #77949 comes bare with valves only
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