PRC LS7x 285cc CNC Ported 400+CFM Heads

Precision Race Components LS7 CNC 285cc ported cylinder heads. All new 6-bolt Precision Race Components LS7 cylinder heads! MADE in the USA!! CAST in the USA!! MACHINED in the USA!! Now available with optional high compression 64cc combustion chambers! 2.250" Intake Valve / 1.610" Exhaust Valve Available With Hollow-Stem, or Titanium Intake Valves PRC Dual Spring Kits featuring PAC .660", .700" or .750" lift springs are available. Includes new seats, seals and titanium retainers. 6-Bolt Cylinder Heads with Thicker Deck Surface CHE Bronze Guides Will Work on Both Standard GM 4-Bolt & Aftermarket LSx / RHS 6-Bolt Style Engine Blocks Completely Assembled & Setup To Your Specs Extensive CNC and dyno testing has resulted in one of the most affordable and powerful LS7-based cylinder heads available! Flowing up to 53 CFM more than the stock GM LS7 head, the all-new PRC cylinder heads offer both unmatched power and airflow! The 285cc runner is recommended for higher HP applications with a minimum bore size of 4.125". The PRC LS7 285cc cylinder heads are available with hollow-stem or titanium intake valves. The hollow-stem intake valves shed significant intake valve weight and allow for additional lift. The titanium intake valves will be the lightest choice however and offer the best durability possible! Cylinder Head Specs: Valve Angle: 12 Degree Intake CC: 285cc Intake Valve: 2.250" Exhaust Valve:1.610" Chamber Size: 70cc **Valve spring lift ratings are based on using titanium intake valves. LS7 Intake LS7 Exhaust PRC 285cc LS7 Intake PRC LS7 Exhaust .200 161 114 169 119 .300 227 171 248 179 .400 291 193 311 211 .500 330 203 353 224 .600 351 209 386 235 .650 353 204 393 241 .700 353 209 407 246