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Chevrolet Performance Camshaft - LS9 - 12638427 cam: specs, price & owner results
211/230 .562"/.562" 122.5 LSA
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| Spec | Value |
|---|---|
| Part number | 12638427 |
| Engine | LSA/LS9 |
| Application | SUPERCHARGED - ROOTS |
| Style | HYDRAULIC ROLLER |
| Cam bolt | THREE BOLT |
| Duration @ .050 (int/exh) | 211/230 |
| Lift (int/exh) | .562/.562 |
| LSA | 122.5 |
| Price | $319.99 (Brian Tooley Racing, 2026-09-29) |
Buy it: Chevrolet Performance Camshaft - LS9 - 12638427 · maker's page
Parts to install it: cam bolts (3-bolt); 7.400 in. pushrods (hardened; 7.400 in. is stock length, so measure first); timing cover gaskets (the front cover comes off to change the cam); timing chain (replace it on a high-mileage engine or with a big cam); valve springs (.600 in. lift) — stock springs aren't made for this cam. More: LS cam swap guide.
- Tune: Aftermarket cams need idle, fuel, spark and torque-model changes.
- Valve springs: Upgraded valve springs required
- Cam gear: Three bolt
What owners report with this cam
| Engine | Heads | HP | TQ | Measured at | Adder | Confidence |
|---|---|---|---|---|---|---|
| 2003 LM4 (refreshed stock bottom end, ARP rod bolts, Hellfire rings) | 744 | Wheel | On3 76 mm turbo (ported exhaust housing) | High | ||
| LS2 | LS3 | 735 | 648 | Not stated | supercharger | High |
| 5.3L LM7 | 243 Corvette head + 799 truck head | 711 | Wheel | turbo | Medium | |
| 5.3 (under new management) | 243 Corvette head + 799 truck head | 711 | Wheel | turbo (XT80mm) | High | |
| Hybrid 339 ci (LS3 block + LR4 4.8L crank) | Trick Flow GenX 255 (LS3) | 701 | 598 | Crank | Precision 76mm single turbo | High |
| LS2 (Thompson Motorsports forged) | LS3 heads milled 0.040 in by Hood's Machine Shop | 700 | 680 | Wheel | twin turbo | High |
| 6.2L LS | 664 | Not stated | supercharged (Kenne Bell) | Medium | ||
| LS3 crate (stock) | 643 | 568 | Wheel | supercharged (Magnuson TVS 2300, ported) | High | |
| LS3 | stock LS3 | 643 | 568 | Wheel | Magnuson TVS2300 supercharger | High |
| LSA | stock heads | 618 | 618 | Wheel | supercharger | Medium |
| 5.3L LM7 (Strictly Performance boost-ready, supercharged) | ported 706 (Katech) | 606 | 523 | Crank | Vortech V3 SCI centrifugal supercharger, non-intercooled (3.60 in pulley) | High |
| LS3 | 590 | 510 | Wheel | supercharger | High | |
| 5.3L LM7 (junkyard, 200K+ miles) | 581 | 504 | Crank | Vortech V3 SCI centrifugal supercharger, non-intercooled (3.60 in pulley) | High | |
| LY6 6.0L V8 (stock) | 580 | Not stated | LSA supercharger | Medium | ||
| stock 5.3 | 572 | 451 | Wheel | twin turbos (CX Racing GT45) | High | |
| 477 | Wheel | ProCharger P1 supercharger | Medium | |||
| 5.3L LS | 477 | Wheel | supercharger | Medium | ||
| LY6 6.0 | stock LY6 (LS3-style) | 475 | 443 | Crank | NA | High |
| 5.3L LM7 (Strictly Performance boost-ready, NA) | ported 706 (Katech) | 428 | 400 | Crank | NA | High |
| Strictly Performance 5.3L (stock iron block/crank, Gen IV rods, hard-anodized flat-top cast pistons) | Katech-ported 706 (mildly ported) | 428 | 400 | Not stated | NA | High |
| LM7 5.3 | stock 5.3L | 420 | 393 | Not stated | NA | High |
| LS (LM7 5.3L test engine) | stock 5.3L | 420 | 393 | Crank | NA | High |
| LM7 5.3L | stock 5.3L heads | 419 | 394 | Crank | NA | High |
| L76 6.0 | 416 | 376 | Not stated | NA | Medium | |
| 6.2L | stock, milled .025 | 414 | 406 | Wheel | NA | High |
From real tunes on this cam
Real HP Tuners tunes in our library that run this exact cam (as of 2026-10-15), read straight out of the files.
4 naturally aspirated tunes with this cam on Gen III computers (0411/P01, P59)
engines: 5.3 L, 6.0 L; computers: P01.
| Setting | Range | Median | Tunes |
|---|---|---|---|
| Hot idle target | 625 rpm to 800 rpm | 700 rpm | 4 |
| Warm idle airflow, in gear | 6.0 g/s to 6.2 g/s | 6.1 g/s | 4 |
| Idle spark (around 800 rpm) | 16° to 28° | 18° | 4 |
What these tunes run, not your numbers: heads, injectors, converter, fuel and altitude all change what your engine wants. For starting values built for your engine, injectors and fuel, use the turn-on tune builder. A turn-on tune only gets it running: always finish on a dyno, and read our safe tuning limits before any wide-open pass.
Installing it? Follow our LS cam swap guide (Gen III and Gen IV, any chassis), with every torque spec you need.
Build a turn-on tune sheet for this cam → Idle and spark starting values, from real tunes. Always finish on a dyno.
New Already running this cam? Send us your tune and we'll compare it with similar builds and tunes we've reviewed. Get a Tune Report → $19, free while we launch.