PRC LS7x 265cc 7.0L CNC Head Porting

These are for customer supplied cylinder heads. We are not supplying castings! This is porting, valve job, and milling only! Precision Race Components LS7 CNC 265cc ported cylinder heads. Fully CNC ported LS7-based cylinder heads! (All New GM LS7 Cylinder Head Castings) Based off PRC's CNC Ported LS7 Heads 2.200"/1.610" Valves (base price for exchange includes new stainless exhaust valves) Available with PRC Double Spring Kit Complete With PRC Double Springs, Titanium Retainers, Seats, & Seals Completely Assembled & Setup To Your Specs!! Available With Stainless, Hollow Stems, or titanium valves! Extensive CNC & dyno testing has resulted in one of the most affordable & powerful LS7 based cylinder heads available! Flowing up to 35cfm more than the stock GM LS7 head, the all new PRC cylinder head offers both unmatched power & airflow. The PRC LS7 cylinder head is available with standard stainless exhaust valves and titanium intake valves. Flow Data: @ 4.125" Bore Plate Superflow 600 LS7 Intake LS7 Exhaust PRC 265cc LS7 Intake PRC LS7 Exhaust .200 161 114 169 119 .300 227 171 248 179 .400 291 193 308 211 .500 330 203 351 224 .600 351 209 383 235 .650 353 204 388 241 .700 353 209 393 246 **If stock valve guides are damaged or badly worn, there is an additional $150 fee to replace them. **If stock guides are replaced, stock springs can not be used due to the larger O.D. of the aftermarket guide. Spring kit must be replaced with aftermarket as well.