Plan the swap.Skip the forum rabbit hole.
Gen III and IV LS or Gen V LT, one planner. Pick your chassis, engine, trans, harness and throttle. You get the mounts, pan, headers, harness, fuel, cooling and driveline parts free. The $24 Build Sheet adds the stuff that actually stops a swap: wiring steps, VATS and tune, fuel pressure, and a first-start checklist.
WORK ORDER · SAMPLE#0350
| Mounts, pan, headers, driveshaft Sikky Stage 2 package | $3,863 |
| Gen IV DBC CANbus Pro harness Wiring Specialties, keeps tach + gauges | $1,395 |
| T56 5.5″ relocation shifter Sikky, GTO cup | $560 |
| T56 clutch master cylinder kit Sikky, for the GTO T56 | $314 |
| Fuel: 58 psi returnless | $400–900 |
| Cooling + steam vent | $340–1,020 |
Sample shows key parts only. The full plan also covers clutch/flywheel, tune, hoses, fittings and more, so the real total is higher.
6 warningsFive picks. One sheet.
Built for first-timers who don't know what they don't know, and for guys who've done it and just want the list.
Pick the combo
Chassis, engine (LS 4.8 through LT4 and L8T), transmission, factory-modified or standalone harness, and drive-by-wire or cable.
Get the parts list
Free: mounts, oil pan, headers, harness/ECU, fuel, cooling, accessory drive and driveline, with rough price ranges and a source on every line.
Unlock the Build Sheet
$24: the compatibility flags for your combo, step-by-step harness work, VATS and tune, fuel setup, and a first-start checklist you can print.
The list is free. The know-how is $24.
- Mounts, oil pan and headers for your chassis
- Harness/ECU, fuel, cooling, accessory drive, driveshaft
- Rough price range per line, plus a total
- Part numbers only where the vendor shows them
- Source link on every line
- Compatibility flags: 24x vs 58x, pedal and ECU match, AFM/DFM, LT direct injection, 8- and 10-speed TCMs, TV cable, pan and steering-box clearance
- Harness steps for your harness choice
- VATS and tune notes, plus exactly where to find them in HP Tuners
- Fuel: pressure target, returnless vs return, Gen V lift-pump spec
- First-start checklist you can print and tick off
- Video walkthroughs from the shop (coming)
Every line shows its receipts.
Each fact links to where it came from: Holley, Summit, Speedway, Dirty Dingo, Sikky, Novak, PSI, LS1Tech and others. Each also carries a confidence tag. Anything we're not sure of is stamped for a hands-on review before it's treated as gospel.
20 platforms to start
PHOTO
Kolby, KMC Auto
I worked for free at a friend's shop for years, then spent a few more years making little money while I learned. I spent 11 years as a jet-engine mechanic, and I've been a lead there for the last 3. I put an LS2 and T56 6-speed from an '06 GTO into my '04 350Z, and pulled the 4.8 out of my 2008 Silverado for a 6.0 I built myself. Next, I'm swapping an L8T into my 2015 Sierra in place of its 4.3. Every build here gets checked against what actually works in my barn shop.
Straight answers
Is the parts list really free?
Yes. No account, no card. You can put in an email if you want updates for your chassis.
Why are some prices marked "est."?
"Listed" means we saw that price on the vendor's page when it was checked (Oct 2026). "Est." is a rough range. Prices move, so always check the link.
Does it do LT swaps too, or just LS?
Both, on one site. Gen V LT engines (L83, L84, L86, L87, LT1, LT4, L8T) are direct injection with a cam-driven high-pressure fuel pump and an E92-family ECM, so the controller, fuel, mounts and harness are a different swap than a Gen III/IV LS. The planner keeps them on their own path and the Build Sheet flags DFM, wet vs dry sump, and 8L90/10L80 TCM matching.
What about the new Gen 6 engines?
GM has announced the Gen 6 L76 5.7, L78 6.6 and LS6 6.7. They're listed as coming soon. We'll add them once real swap parts and controllers exist.
Will it guarantee fitment?
No. It's a planning sheet built from vendor and tech sources. Confirm fitment with the vendor, especially on pans, headers and steering.
What do I get for $24?
The full Build Sheet for one combo: compatibility flags, harness steps, VATS and tune notes, fuel setup, a first-start checklist, and video slots. It's printable and has a link you can come back to.