RRR Performance Parts https://validator.w3.org/feed/docs/rss2.html PRC Stage 2.5 LS1 CNC Ported Heads PRC CNC Porting Service for 6.2L Hemi Heads PRC 2014+ 5.3L CNC Porting Service PRC CNC Porting Service for 6.4L Hemi Heads PRC 247cc CNC Ported Cylinder Heads with .700″ MAX Lift Package PRC 247cc CNC Ported Cylinder Heads with Upgraded Valves PRC 237cc CNC Ported Cylinder Heads with .700″ MAX Lift Package PRC 237cc CNC Ported Cylinder Heads with Upgraded Valves PRC CNC Ported 2014+ LT1 Cylinder Heads New GM Castings PRC LS7x 285cc E85 68cc CHamber, CNC Ported 400+CFM Heads with .700″ MAX Lift Package PRC LS3 As-Cast Aftermarket Heads with .700″ MAX Lift Package PRC Stage 2.5 LQ9 CNC Porting Service – Cathedral Port Heads (Customer Supplied Castings) PRC 247cc CNC Ported Cylinder Heads PRC 2019+ L87 and LT2 ported OEM heads PRC CNC Ported 2014+ LT4 Cylinder Heads GM Castings PRC 237cc CNC Ported Cylinder Heads PRC As-Cast 225cc LS1/LS2 Cathedral Heads – Big Chamber with Upgraded Valves PRC 15-Degree 220cc As-Cast Cathedral Heads with .700″ MAX Lift Package PRC 15-Degree 220cc As-Cast Cathedral Heads with Upgraded Valves PRC Stage 2.5 4.8L/5.3L CNC Porting Service – Cathedral Port Heads (Customer Supplied Castings) PRC As-Cast 225cc LS1/LS2 Cathedral Heads PRC Aftermarket LT4 CNC Cylinder Heads PRC Brawler LS6 Style CNC Ported Cylinder Heads w/TSP .660″ Spring Kit & Titanium Retainers PRC As-Cast 225cc LS1/LS2 Cathedral Heads – Big Chamber with .700″ MAX Lift Package PRC LS7x 285cc CNC Ported 400+CFM Heads PRC 260cc LS3 Aftermarket Heads, 68cc, Hollow-Stem Intake Valves, TSP .660″ Dual Spring Kit w/ Ti Retainers PRC 15-Degree 220cc As-Cast Cathedral Heads PRC Brawler LS3 Style CNC Ported Cylinder Heads w/TSP .660″ Spring Kit & Titanium Retainers PRC Aftermarket LT1 CNC Cylinder Heads PRC 6-Bolt 265cc LS7 w/ Titanium Intake/Hollow Stem Exhaust Valves, TSP .660″ Dual Spring Kit w/ Ti Retainers PRC As-Cast 225cc LS1/LS2 Cathedral Heads – Big Chamber PRC LS3 As-Cast Aftermarket Heads, 68cc, TSP .660″ Dual Spring Kit w/ Ti Retainers PRC LS3, L92, & LSA CNC Cylinder Head Porting (Customer Supplied Castings) PRC LS7 265cc 7.0L CNC Head Porting PRC 2014+ 6.2L CNC Porting Service PRC Stage 2.5 LS6 CNC Porting Service – Cathedral Port Heads (Customer Supplied Castings) Chevrolet Performance L8T 6.6L Crate Engine Chevrolet Performance L8T 6.6L Crate Engine PRC As-Cast 225cc LS1/LS2 Cathedral Heads with .700″ MAX Lift Package PRC As-Cast 225cc LS1/LS2 Cathedral Heads with Upgraded Valves TSP Forged Gen 3 Predator (Coyote) 11:1 Short Block Resleeved /W Hoops TSP Forged Gen 3 Predator (Coyote) 12:1 Short Block Resleeved /W Hoops TSP LT 376 Short Block TSP LT2 427 Re-sleeved 12.1:1 Short Block TSP LT2 427 Re-sleeved 10.6:1 Short Block TSP LT2 388 Re-Sleeved 10.6:1 Short Block TSP LT2 388 Re-sleeved 11.6:1 Short Block TSP 426 CID 2000HP Hemi Long Block TSP Brawler Resleeved 427 CID LT1 Short-Block Home