99-06 Trucks Heads

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• 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, & Seals
  Springs, 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!

• 237cc Fully CNC Ported Intake Runners
• 84cc Fully CNC Ported Exhaust Runners
• TSP Dual Spring Kit w/ PAC Springs Rated To .660" Lift
• 68cc CNC Machined Chambers(call for different chamber size)
• CHE Bronze Guides
• 2.100" Intake / 1.600" Stainless Valves  
• Factory Rocker Friendly!!
• ***NOW AVAILABLE WITH HOLLOW STEM INTAKE VALVES!!! SAVES APPROXIMATELY 15 Grams!!!***

The all new 237cc cylinder head is finally available for customers looking for the pinnacle of LS cathedral port performance.   The new 237cc port has been flow bench tested to flow over 330cfm & can support everything from smaller camshaft street engines all the way to all our race engines. This cylinder head is a combination of a max effort high flowing port combined. 

Precision Race Components all new cylinder head castings completed with 227cc runners. For stock cubic inch LS1/LS2 applications requiring smaller chambers for extra compression

Features: 

• 227cc Fully CNC Ported Intake Runners
• 84cc Fully CNC Ported Exhaust Runners
• Small Bore Chambers For Increased Horsepower & Torque+ SPECIFICALLY DESIGNED FOR 3.9"-4" BORE APPLICATIONS
• TSP Spring Kit w/ PAC Valve Springs Rated To .660" Lift
• 62cc CNC Machined Chambers(call for smaller CC)
• CHE Bronze Guides
• 2.065" Intake / 1.600" Stainless Valves  ***NOW AVAILABLE WITH HOLLOW STEM INTAKE VALVES!!!***
• Factory Rocker Friendly!!*
  

The all new 227cc cylinder head is finally available for customers looking for the pinnacle of LS cathedral port performance.  Now is your chance to own the same cylinder head that currently holds the fastest stock bottom end heads / cam record!  The new 227cc port has been flow bench tested to flow over 320cfm & can support everything from smaller camshaft street engines all the way to all our race engines. This cylinder head is a combination of a max effort high flowing port combined with a smaller chamber designed for max power in stock cube applications. 

This cylinder head was used on the Texas Speed 98 Camaro when it lowered the heads cam stock bottom end 1/4 mile record to 9.66!!

Flow Data:

4.00" Flow Plate - No Exhaust Pipe

 

LIFT	INTAKE FLOW	EXHAUST FLOW
.100"	68 CFM	56 CFM
.200"	145 CFM	115 CFM
.300"	214 CFM	167 CFM
.400"	261 CFM	202 CFM
.500"	300 CFM	219 CFM
.600"	322 CFM	238 CFM
.650"	330 CFM	236 CFM