LS3 6.2L head porting.
Rectangle-port LS3 — bowls blended, chambers unshrouded. Our most popular LS port.
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″ | 155 | 158 | +3 | +2% |
| 0.300″ | 222 | 230 | +8 | +4% |
| 0.400″ | 272 | 288 | +16 | +6% |
| 0.500″ | 305 | 312 | +7 | +2% |
| 0.600″ | 314 | 361 | +47 | +15% |
| 0.700″ | 303 | 370 | +67 | +22% |
Peak gain lands at 0.700″ lift: 303 CFM stock to 370 CFM ported. Low lift stays close to stock (+3 CFM at 0.200″), so the LS3 keeps its street manners and makes its money up high. At 0.700″ it moves 370 CFM against 303 stock.
What we do to it.
Rectangle-port CNC with the bowls blended and chambers unshrouded — our most popular LS port, big top-end where a cam wants it.
Fitment and pricing.
Cars these heads come off.
- 2008–2013 Corvette
- 2010–2015 Camaro SS
- G8 GXP
- LS swaps
Valve upgrades for this head.
Offered with the port work on this platform, fitted while the heads are apart.
LS3 porting, answered.
What does Carma do to LS3 6.2L heads?
Rectangle-port CNC with the bowls blended and chambers unshrouded — our most popular LS port, big top-end where a cam wants it.
What does LS3 6.2L head porting cost?
$1,200 for the pair of LS3 6.2L 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?
2008–2013 Corvette · 2010–2015 Camaro SS · G8 GXP · LS 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 LS3 head flow?
Peak measured gain is +67 CFM at 0.700″ lift — 303 CFM stock to 370 CFM ported on our SF-1020 bench.
What should I run with ported heads?
Cam, ported intake, 1⅞ headers. Street or strip. 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.