PRC 227cc CNC Ported Small Bore 3.9"-4" Cylinder Heads

Precision Race Components all new cylinder head castings completed with 227cc runners. For stock cubic inch LS1/LS2 applications requiring smaller chambers for extra compression MADE IN THE USA!! CAST IN THE USA!! MACHINED IN THE USA!! Features: 227cc Fully CNC Ported Intake Runners 84cc Fully CNC Ported Exhaust Runners Small Bore Chambers For Increased Horsepower & Torque+ SPECIFICALLY DESIGNED FOR 3.9"-4" BORE APPLICATIONS TSP Spring Kit w/ PAC Valve Springs Rated To .660" Lift 62cc CNC Machined Chambers CHE Bronze Guides 2.065" Intake / 1.600" Stainless Valves ***NOW AVAILABLE WITH HOLLOW STEM INTAKE VALVES!!!*** Factory Rocker Friendly!!* The all new 227cc cylinder head is finally available for customers looking for the pinnacle of LS cathedral port performance. Now is your chance to own the same cylinder head that currently holds the fastest stock bottom end heads / cam record! The new 227cc port has been flow bench tested to flow over 320cfm & 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 with a smaller chamber designed for max power in stock cube applications. This cylinder head was used on the Texas Speed 98 Camaro when it lowered the heads cam stock bottom end 1/4 mile record to 9.66!! Flow Data: 4.00" Flow Plate - No Exhaust Pipe LIFT INTAKE FLOW EXHAUST FLOW .100" 68 CFM 56 CFM .200" 145 CFM 115 CFM .300" 214 CFM 167 CFM .400" 261 CFM 202 CFM .500" 300 CFM 219 CFM .600" 322 CFM 238 CFM .650" 330 CFM 236 CFM