Mast Motorsports LS7 305 Black Label heads are designed for all-out naturally aspirated 4.125"+ bore engines. If you are looking to make more power with your LS7, LSX or other 4.125" engine, the Black Label LS7 305 head is a great choice.
600hp to the tire is easily attainable with this head, proper cam and headers on 427ci engines.
Dyno proven power.
- Utilizes the Gen IV LS7 valve-train and intake manifold
- Designed for any new Gen IV short-block with 4.125" bore or larger
- Uses a 2.250" intake valve and 1.600" exhaust valve
- Has a 294cc intake port
- Has 70cc combustion chamber
- Has a deck thickness of .750"
***Due to the thicker deck and higher valve cover rails some beauty covers are not compatible. When using Corvette (Y-Body) front accessories alternator may need to be clearanced.
| Flow Data w/4.125" Bore Plate |
| Lift |
Intake |
Exhaust |
| 0.100 |
76 |
65 |
| 0.200 |
163 |
118 |
| 0.300 |
245 |
171 |
| 0.400 |
307 |
212 |
| 0.500 |
350 |
229 |
| 0.600 |
379 |
245 |
| 0.650 |
388 |
247 |
| 0.700 |
395 |
249 |
| 0.800 |
401.5 |
258 |
| 0.900 |
406 |
260 |
| 1.000 |
410 |
263 |
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