Wiring, Plumbing, and Starting an OBS LS Swap!

We show you the wiring steps (0-11 min), plumbing(11-24 min), including parts needed to LS Swap your Chevy or GMC OBS from TBI. This one is done with a Holley carb, intake, and an MSD 6014 Ignition box.

Speed-Engineering parts:
Headers: 25-1137
Trans mount: 26-1050
crossmember: 33-1072-BK
engine mounts: ES-3.1121G swap plated: 26-1036
X-Pipe 25-1138
Wideband 30-4110
plug wires 26-1066
fire sleeves 26-1075
coils 26-1028
Coil harnesses 31-1018
fuel pump Walgss342BX

ICT:
trans fittings: AN710-06A
Steam vent kit 551837-ls01
temp sensor SEN001
Fuel line adapters for OBS
F06ANFM1415 & F06ANFM1615

Holley parts:
regulator 12-880
throttle bracket 20-95

Summit Racing
flex plate kit: ADD-712500A
lots of fuel fittings
push loc fuel hose
trans cable linkage SUM-700204

#obs #chevy #gmc #lsswap #carbedLS #carburetor #squarebody #OBS #engineswap #Holley #transmission #musclecar #restoration #700r4 #ictbillet

[richardpugh]

Excellent video. Thank you for sharing. Will definitely save this for a future project.

[senderonabender]

Probably the most useful info I’ve found thank you

[quentintraywick]

Great video. I'm wrkn on my third swap and you showed me some new tht will save time and money

[Mjhmjh]

Good work I do harnesses for these trucks too

[PeterHatch-mxzc]

One thing ! Give you credit you work clean and work area that two things !👍😁

[Aaron-fqkp]

Awesome video! Thanks for sharing all the info!

[chapparitatx]

Yall youtubers just make it hard to understand i still dont know what i need or where to re rout it

[jerrywilliams]

Why go through changing all that factory stuff to go with an old out dated carb setup?

[PeterHatch-mxzc]

Why did you not use !EFI its sounds a lot crisper with the carburetor on flipping the throttle

[youngnation]

That walbrogh fuel pump will push over 20psi … need to regulate the fuel down to 5-6psi.

[baileyjohnson]

☆☆☆☆☆☆☆help☆☆☆☆☆☆☆
Did you cut/remove every wire going to or from the ecm along with wires going from ecm to the white "ac" plug

[aspectlav]

How do I make my transmission from my 94 c1500 to work with my 03 5.3 ? I have the correct adapter plate and it’s all bolted up but it’s not shifting

[jeremysmith]

Thanks for this as the timing couldn't be more perfect as im in the same spot with my obs ls swap. I do have a couple questions for you. 1st one is the check engine light wire? I have unhooked it from the connector behind the glove box and its already completely unhooked/unplugged from the ecm. Now does that get a ground to activate or ? Because my wire is hot anytime the key is on? 2nd question is the brake switch wire the purple one and its hot with the brake pedal not touched but when the brake is pressed it stays hot but my brake lights and everything work. If you have any advice or anything you can think of i would greatly appreciate it and keep up the great work and the advice as i think all of us are doing these swaps right now. Thanks in advance!!

[Sandmanjones]

So the green/WhT wire goes to the green wire from ls harness?

[dsco]

Thanks 🙏 u made it a lot easier to understand 🫡💯