6.4L 392 head porting.
NA 392 Apache — CNC ports, big valves, the works. Real top-end on a built 392.
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″ | 154 | 162 | +8 | +5% |
| 0.300″ | 236 | 259 | +23 | +10% |
| 0.400″ | 291 | 308 | +17 | +6% |
| 0.500″ | 321 | 340 | +19 | +6% |
| 0.600″ | 330 | 355 | +25 | +8% |
| 0.700″ | 332 | 363 | +31 | +9% |
Peak gain lands at 0.700″ lift: 332 CFM stock to 363 CFM ported. Low lift stays close to stock (+8 CFM at 0.200″), so the 6.4 392 keeps its street manners and makes its money up high. At 0.700″ it moves 363 CFM against 332 stock.
What we do to it.
NA 392 Apache heads — CNC ports, big valves, the works. Real top-end on a built 392.
Fitment and pricing.
Cars these heads come off.
- Scat Pack / 392 — Charger
- Challenger
- Durango
- Grand Cherokee SRT
- Ram 2500
Valve upgrades for this head.
Offered with the port work on this platform, fitted while the heads are apart.
6.4 392 porting, answered.
What does Carma do to 6.4L 392 heads?
NA 392 Apache heads — CNC ports, big valves, the works. Real top-end on a built 392.
What does 6.4L 392 head porting cost?
$1,200 for the pair of 6.4L 392 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?
Scat Pack / 392 — Charger · Challenger · Durango · Grand Cherokee SRT · Ram 2500. 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 6.4 392 head flow?
Peak measured gain is +31 CFM at 0.700″ lift — 332 CFM stock to 363 CFM ported on our SF-1020 bench.
What should I run with ported heads?
Cam, intake, long-tube headers. Heads do their best work as part of a combination, not on their own.
Other HEMI 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.