PRC 247cc CNC Cathedral Ported Cylinder Heads

Precision Race Components all new cylinder head castings completed with 247cc runners. For 408 cubic inch and larger applications with 4.03"+ bore sizing. Features:  247cc Fully CNC Ported Intake Runners 84cc Fully CNC Ported Exhaust Runners TSP .750 Spring Kit w/ PAC Valve Springs & Titanium Retainers 68cc CNC Machined Chambers CHE Bronze Guides 2.120" Hollow Stem Intake Valves/ 1.600" Stainless Exhaust Valves Factory Rocker Friendly!!* The all new 247cc cylinder head is finally available for customers looking for the pinnacle of LS cathedral port performance.