PRC 237cc CNC Ported Cylinder Heads

Precision Race Components all new cylinder head castings completed with 237cc runners. For 370 cubic inch and larger applications with 4.00"+ bore sizing.   MADE IN THE USA!! CAST IN THE USA!! MACHINED IN THE USA!! Features:  237cc Fully CNC Ported Intake Runners 84cc Fully CNC Ported Exhaust Runners TSP .660 Spring Kit w/ PAC Valve Springs & Titanium Retainers 68cc CNC Machined Chambers CHE Bronze Guides 2.100" Hollow Stem Intake Valve / 1.600" Stainless Exhaust Valves   Factory Rocker Friendly!! The all new 237cc cylinder head is finally available for customers looking for the pinnacle of LS cathedral port performance.   The new 237cc port has been flow bench tested to flow over 330cfm & can support everything from smaller camshaft street engines all the way to all our race engines. This cylinder head is a combination of a max effort high flowing port combined.  Flow Data: 4.030" Flow Plate - No Exhaust Pipe   LIFT INTAKE FLOW  EXHAUST FLOW   .100"   66 CFM  57