PRC LS3 Aftermarket 6-Bolt 255cc CNC Cylinder Heads

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  • Regular price $2,545.95

All Precision Race Components (PRC) cylinder heads come fully CNC-ported and machined using state-of-the-art technology!




PRC's aftermarket casting LS3/L92/L99 cylinder heads come standard with the following options:

  • NEW PRC 13-Degree Valve Angle LS3 Castings
  • Improved Piston-to-Valve Clearance For Extra Compression & Larger Camshafts
  • Smaller Than Stock Intake Port Volume For Improved Port Velocity
  • Stainless Steel 2.170" Intake, 1.60" Exhaust Valves
  • Billet Rocker Pedestals
  • TSP .660" Dual Spring Kit w/ PAC Valve Springs, Titanium Retainers, Seats, & Seals
  • Completely Assembled and Milled to Your Specifications
  • 60-68cc Chambers
  • Available Milled Down To 65cc Chambers While Still Keeping Better Than Stock P/V!!

All PRC cylinder heads are extensively researched and tested. The all-new PRC aftermarket casting LS3 cylinder heads are designed to flow considerably more than a gm ported casting while keeping the port sizes smaller for improved port velocity. The result is a cylinder head that is smaller than a stock GM LS3 port and moves more air than any other ls3 cylinder heads! 

The all new PRC aftermarket casting LS3 heads are the perfect option for customers looking for the ultimate in LS3/L99/L92 cylinder head technology


The PRC aftermarket casting LS3 cylinder heads are available in 2 different configurations: 


  • 255cc Runners for max effort stock cube LS2/LS3/L99/L92 engines looking for a 370cfm cylinder head that can be aggressively milled & still keep better than stock p/v
  • 260cc Runners For LS3/L99/L92 stroker engines needing a 380cfm+ cylinder head!

The 13-degree valve angle will allow for the ability to run more compression and larger camshafts thanks to additional piston-to-valve clearance!!  


Intake Flow 

 Exhaust Flow


 157 cfm

 117 cfm


 224 cfm

 170 cfm


 281 cfm

205 cfm


 329 cfm

 225 cfm


 358 cfm

 235 cfm

 .650"  366 cfm  240 cfm
 .700"  369 cfm  243 cfm