PRC LS7x 265cc CNC Small Bore Heads

Requires at least a 4.065" Bore  Precision Race Components LS7 CNC 265cc ported cylinder heads.  Click Here to SEE why we build better heads!  MADE IN THE USA!! CAST IN THE USA!! MACHINED IN THE USA!!   PRC 6-Bolt LS7 Cylinder Heads with Thicker Deck Surface Will Work on Both Standard GM 4-Bolt & Aftermarket LSx / RHS 6-Bolt Style Engine Blocks 2.205"/1.59" Valves TSP .660" Dual Spring Kit w/ PAC Springs, Retainers, Seats, & SealsSprings, Titanium Retainers, Seats, & Seals CHE Bronze Guides Completely Assembled & Setup To Your Specs Available With Stainless Steel, Hollow-Stem, or Titanium Intake Valves 68cc Chamber Size as Standard Extensive CNC and dyno testing has resulted in one of the most affordable and powerful LS7-based cylinder heads available! Flowing up to 35 CFM more than the stock GM LS7 head, the all-new PRC cylinder heads offer both unmatched power and airflow! The PRC Small Bore LS7 cylinder heads are designed for both stroker, and stock cube applications with a 4.060"-4.100" bore.  For bores larger than 4.100" bore checkout the PRC LS7 265cc & 285cc cylinder heads!The PRC LS7 cylinder heads are available with hollow-stem intake and titanium intake valves. We recommend no more than .625" total intake valve lift with the hollow-stem intake valves and no more than .670" total valve lift with the titanium intake valves.     Superflow 600          PRC 265cc LS7 Intake   PRC LS7 Exhaust  .200  169  118  .300  246  176  .400  304  208  .500 348  221  .600 380  230  .650 383  235  .700 388  240    **Valve spring lift ratings are based on using titanium intake valves.