Home > C5 Corvette 97-04 > Camaro Engine Upgrades > LS Cylinder Heads > Patriot Performance CNC Ported 5.3 2.02"/1.57" 63cc Heads Assembled

Patriot Performance CNC Ported 5.3 2.02"/1.57" 63cc Heads Assembled

Patriot Performance CNC Ported 5.3 2.02"/1.57" 63cc Heads Assembled
Item Code# 2027
Regular Price$1,145.00
Qty.


Fits: 1999-2002 Camaro, Z28 & SS, Trans Am & Corvette LS1

Our custom 5 axis CNC machined new GM castings make these heads a must have for any performance oriented GM LS series engine. Custom designed runners flow up to 60 cfm over stock OEM versions. The 63cc chambers will increase the compression on a stock LS1 from 10-1 to 10.8-1. Based on other modifications, gains of up to 40 rwhp can be expected. These are a great choice for naturally aspirated engines and applications where 75-150hp nitrous systems will be used. The Stage II heads feature 21-4N 2.02”/1.57” stainless steel valves, our Original Patriot Gold Dual .650” Lift springs, titanium retainers, Super 7 machined locks, custom honed bronze guides, machined spring bases, and viton rubber seals.

*Sold as Pair

Technical Specs:

  • Combustion Chamber: 63cc
  • Intake Runner: 220cc
  • Exhaust Runner: 67cc
  • Intake Valve: 2.02"
  • Exhaust Valve: 1.57"
  • Max. Valve Spring Lift: 0.650"
  • Spring Pressure Closed: 135 lbs. @ 1.800"
  • Spring Pressure Open: 375 lbs. @ 1.090"
  • Retainer Material: Titanium
  • Valve Seal Material: Viton
  • Valve Guide Material: Manganese Bronze
  • Valve Job: 5-angle







* Please note that there is a shipping discount on multiple items in the same order(excludes oversized items). Discount will be given when we process your sale. Shipping price reflects shipping within the continental United States. Alaska, Hawaii and Puerto Rico will have additional shipping charges. Hoods and other oversize items must ship truck freight. The customer is responsible for the truck freight charges to be paid on delivery.

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