LS1 5.7L head porting.
Cathedral-port LS1/LS6 — the proven recipe. Wakes up a cammed 5.7.
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″ | 152 | 154 | +2 | +1% |
| 0.300″ | 191 | 221 | +30 | +16% |
| 0.400″ | 245 | 264 | +19 | +8% |
| 0.500″ | 245 | 288 | +43 | +18% |
| 0.600″ | 246 | 303 | +57 | +23% |
Peak gain lands at 0.600″ lift: 246 CFM stock to 303 CFM ported. Low lift stays close to stock (+2 CFM at 0.200″), so the LS1 keeps its street manners and makes its money up high. At 0.600″ it moves 303 CFM against 246 stock.
What we do to it.
Cathedral-port CNC with a competition multi-angle valve job and new stainless valves — 2.02″ intake / 1.57″ exhaust. The repeatable recipe that wakes up a cammed 5.7.
Fitment and pricing.
Cars these heads come off.
- 1997–2004 Corvette
- 1998–2002 Camaro / Firebird
- GTO
- LS swaps
LS1 porting, answered.
What does Carma do to LS1 5.7L heads?
Cathedral-port CNC with a competition multi-angle valve job and new stainless valves — 2.02″ intake / 1.57″ exhaust. The repeatable recipe that wakes up a cammed 5.7.
What does LS1 5.7L head porting cost?
$1,200 for the pair of LS1 5.7L 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?
1997–2004 Corvette · 1998–2002 Camaro / Firebird · GTO · 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 LS1 head flow?
Peak measured gain is +57 CFM at 0.600″ lift — 246 CFM stock to 303 CFM ported on our SF-1020 bench.
What should I run with ported heads?
Cam, intake, 1¾ long-tube 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.