Precision Race Components Aftermarket LT1 CNC Cylinder Heads

Precision Race Components LT1 CNC 312cc ported cylinder heads.  All new 6-bolt Precision Race Components LT cylinder heads! MADE in the USA!! CAST in the USA!! MACHINED in the USA!! Click Here to SEE why we build better heads!  2.165" Stainless Hollow stem Intake Valve / 1.600" Stainless Exhaust Valve TSP .660 Spring Kit w/ PAC Valve Springs & Titanium Retainers 6-Bolt Cylinder Heads with Thicker Deck Surface CHE Bronze Guides Will Work on Both Standard GM 4-Bolt &  Aftermarket LT 6-Bolt Style Engine Blocks Completely Assembled in the USA Extensive CNC and dyno testing has resulted in one of the most powerful LT-based cylinder heads available!    Cylinder Head Specs:Intake CC:    312ccIntake Valve: 2.165"Exhaust Valve:1.600"Chamber Size: 58cc     FLOW NUMBERS Lift                               Intake                         Exhaust .2                                            151                                         117 .3