Mangum Racing Stage 1 Ported 243/799 LS6 Cylinder Heads
Mangum Racing Stage 1 243/799 heads turn selected seasoned GM castings into a fully assembled performance upgrade. CNC-ported intake and exhaust runners, a precision CNC valve job, and upgraded spring hardware improve airflow and valvetrain control while retaining the familiar factory-style LS6 casting.
Key Features
- Selected GM 243 or 799 castings; the supplied core casting number may vary
- 228cc CNC intake ports and 62.5cc CNC combustion chambers
- Stock GM 2.00" intake and 1.55" exhaust valves
- PAC .660" dual valve springs with titanium retainers
- 15° valve angle with factory guides
- Minimum bore: 3.780"; compatible with 4.8L, 5.3L, 5.7L, 6.0L, and larger LS combinations
Airflow Performance
Current listing airflow data; intake and exhaust results are shown in CFM by valve lift.
| Valve Lift | .200 | .300 | .400 | .500 | .600 | .650 |
|---|---|---|---|---|---|---|
| Intake CFM | 145 | 206 | 256 | 293 | 309 | 311 |
| Exhaust CFM | 117 | 155 | 195 | 212 | 228 | 230 |
Installation note: Confirm chamber volume, piston-to-valve clearance, pushrod length, and spring compatibility for the selected camshaft.
Processing & Shipping Overview
Processing occurs before shipping.
Most in-stock items typically process within 2–3 business days before shipment or pickup. Expedited shipping options affect transit time after an order ships and do not speed up processing.
Made-to-order, special-order, vendor drop-ship, and freight items require additional processing time before shipping. Any extended lead times will be noted on the product page when applicable.
For the most up-to-date order status or lead time questions, please contact sales@smgspeed.com or use live chat during business hours.