LT4 6.2L SC head porting.
Supercharged Gen V LT4 — same Gen V 6.2 head as our LT1, CNC-ported to feed the blower. Documented flow.
What this head actually flows.
Intake flow at 28″ — stock and ported, both measured on our own SF-1020 flow bench.
| Valve lift | Stock | Carma CNC | Gain | % |
|---|---|---|---|---|
| 0.200″ | 143 | 144 | +1 | +1% |
| 0.300″ | 218 | 219 | +1 | +0% |
| 0.400″ | 278 | 279 | +1 | +0% |
| 0.500″ | 314 | 327 | +13 | +4% |
| 0.600″ | 309 | 348 | +39 | +13% |
| 0.700″ | 314 | 355 | +41 | +13% |
Peak gain lands at 0.700″ lift: 314 CFM stock to 355 CFM ported. Low lift stays close to stock (+1 CFM at 0.200″), so the LT4 keeps its street manners and makes its money up high. At 0.700″ it moves 355 CFM against 314 stock.
What we do to it.
Supercharged Gen V — same casting family and CNC recipe as our LT1 port (flow shown), opened to feed the blower the air it wants for real gains under boost.
Fitment and pricing.
Cars these heads come off.
- C7 Corvette Z06
- Camaro ZL1
- CTS-V
- LT4 swaps
LT4 porting, answered.
What does Carma do to LT4 6.2L SC heads?
Supercharged Gen V — same casting family and CNC recipe as our LT1 port (flow shown), opened to feed the blower the air it wants for real gains under boost.
What does LT4 6.2L SC head porting cost?
$1,200 for the pair of LT4 6.2L SC heads — both of them, CNC ported on our machine here in Nashville, and the set goes back with its own flow sheet.
Which cars does this fit?
C7 Corvette Z06 · Camaro ZL1 · CTS-V · LT4 swaps. If your combination is not listed, call us and we will tell you straight whether the head is the right move.
How much more does a ported LT4 head flow?
Peak measured gain is +41 CFM at 0.700″ lift — 314 CFM stock to 355 CFM ported on our SF-1020 bench.
What should I run with ported heads?
Upper/lower pulley, ported snout, headers, fuel. Heads do their best work as part of a combination, not on their own.
Other LS & LT heads we port.
The rest of the combination.
Ship them in or drop them off.
Heads can come to us on a pallet or still on the car. Tell us the combination you are building and we will tell you honestly whether porting is the right next step for it.