Mangum Racing CNC Ported 243/799 Cylinder Heads PAIR - Assembled - NO CORE

 

The Mangum Racing Ported 243/799 LS6 Cylinder Heads are designed to transform proven GM factory castings into a reliable, high-performance upgrade. Starting with carefully selected seasoned cores, each set features CNC ported runners and a precision valve job for consistent airflow and long-term durability.

 

Key Features

• CNC ported intake and exhaust runners
  
• Precision CNC valve job
  
• Fully assembled and ready to run
  
• PAC Racing dual valve springs with titanium retainers
  
• Stock GM valves (stage 1) Stainless Steel 2.02/1.57 Valves (Stage 2.5)
  
• Hand-finished and assembled in-house

Airflow Performance Stage 1

Intake: .200” – 145 CFM | .300” – 206 CFM | .400” – 256 CFM | .500” – 293 CFM | .600” – 309 CFM | .650” – 311 CFM

Exhaust: .200” – 117 CFM | .300” – 155 CFM | .400” – 195 CFM | .500” – 212 CFM | .600” – 228 CFM | .650” – 230 CFM

 

Airflow Performance Stage 2.5

Intake: .200” – 145 CFM | .300” – 208 CFM | .400” – 258 CFM | .500” – 296 CFM | .600” – 3010 CFM | .650” – 312 CFM

Exhaust: .200” – 118 CFM | .300” – 157 CFM | .400” – 199 CFM | .500” – 216 CFM | .600” – 232 CFM | .650” – 238 CFM

Construction Details

• Seasoned GM 243/799 castings
  
• 228cc CNC intake ports
  
• 62.5cc CNC combustion chambers
  
• 2.00” intake / 1.55” exhaust valves (stage 1) 2.002” intake / 1.57” exhaust stainless valves (Stage 2.5)
  
• PAC dual spring package
  
• 15° valve angle with factory guides

Fitment

• Minimum bore: 3.780”
  
• Compatible with 4.8L, 5.3L, 5.7L, 6.0L LS engines and larger

Ideal for camshaft upgrades, class racing applications, or improving reliability on LS engines, these heads offer proven performance while retaining factory-style castings.