Mangum Racing 273cc LS7 Cylinder Heads
Built for high-output LS7 combinations, these fully CNC-ported cylinder heads combine a 273cc intake runner and 93cc exhaust port with a 12° valve angle, OEM LS7 valve spacing, and stock intake and exhaust port locations. The 6-bolt design is suited to serious naturally aspirated and boosted street/strip builds.
Key Features
- 6-bolt LS7 casting with OEM LS7 valve spacing and center-bolt valve cover pattern
- 273cc CNC intake ports, 93cc exhaust ports, and 70.5cc combustion chambers
- 2.200" titanium intake valves and 1.610" stainless exhaust valves
- Bronze guides, PAC .660" dual springs, titanium retainers, Viton seals, and 1.250" steel spring seats
- Minimum bore: 4.100"; flat milling available at .006" per cc
- OE- or LS-style 6-bolt head fastener compatibility
Airflow Performance
SuperFlow SF-1020 data with a 4.125" bore plate; intake uses a radius entry and exhaust is tested without a pipe.
| Valve Lift | .200 | .300 | .400 | .500 | .600 | .700 |
|---|---|---|---|---|---|---|
| Intake CFM | 160 | 255 | 313 | 355 | 382 | 393 |
| Exhaust CFM | 117 | 160 | 209 | 224 | 235 | 247 |
Installation note: Measure pushrod length for the final camshaft, gasket, and chamber-milling combination.
Processing & Shipping Overview
Processing occurs before shipping.
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