Official NBS 4.3v6 to GEN 3 V8 swap Guide

[willd74]

I have a 99 silverado ext cab with a 5.3l
and a wrecked 2004 silverado with a 4.8l
want to put the body on newer model can it be done? any help would be greatly
appreciated.

[Kentucky'07]

Ok so heres my questions. How much of wire harness do I need? I looked under the fuse box on the fenderwell and noticed its assembled in blocks. Do I just need to take the block that goes to the motor or do I need more? Also how do I hook up the dbw gas pedal, I dont want to change the under the dash wiring. Can I take the V8 tourque converter and put it in my V6 trans? And finally, roughly how much should I have to give for a complete low milage motor?

[ducky]

Ok so heres my questions. How much of wire harness do I need? I looked under the fuse box on the fenderwell and noticed its assembled in blocks. Do I just need to take the block that goes to the motor or do I need more? Also how do I hook up the dbw gas pedal, I dont want to change the under the dash wiring. Can I take the V8 tourque converter and put it in my V6 trans? And finally, roughly how much should I have to give for a complete low milage motor?

Just get an entire harness. It comes complete. You don't need chassis harness. Not too sure on the DBW gas pedal. V6 converter is the same as a V8 converter. All came out of a 4L60E

[texasRSTsilverado]

Ok. I am just now finishing up with my 6.0 build and about to swap my 6.0 into my 2001 Silverado 1500 SCSB 2WD. I've got pretty much everything together, i just have a couple questions on some GM part numbers. First off, what would the part numbers be for the FRAME MOUNTS for the motor?? I purchased the motor mounts for the 6.0 already. Also, I did decide to go with factory chevy truck e-fans from a 2005 silverado. What are the part numbers for the mounts needed to bolt up the fans?? FYI...my truck is a 2001 Silverado 1500 Single Cab Short Bed 2WD with a 4.3 V6 in it. I am swapping in a 6.0 v8 LQ9 from a 2004 Silverado 1500HD. Any help would appreciated. I would like to try and go to Chevy this week to get the parts ordered that I need.

[RedHeartbeat]

silverado fans means you need a 34" silverado radiator, its just a bolt in application then. THe PN for the mounts is in the V6-V8 conversion topic.

[texasRSTsilverado]

silverado fans means you need a 34" silverado radiator, its just a bolt in application then. THe PN for the mounts is in the V6-V8 conversion topic.

yes. I am upgrading to a 34" radiator. where exactly are the PNs located at? do you have a link?

[zebra]

i might've just missed it in the thread, but will stock 99-02 5.3 exhaust manifolds bolt up to the stock 99 4.3 downpipes & cats?

[banker099]

i might've just missed it in the thread, but will stock 99-02 5.3 exhaust manifolds bolt up to the stock 99 4.3 downpipes & cats?

yep...sure will

[zebra]

yep...sure will

awesome! thanks.

i know it's a little redundant, but i'm kinda spazzing right now because my only vehicle's dead & needs a new engine - and the swap won't cost too much more than replacing the V6, but i wanted to make sure i know everything extra i need:

complete 5.3 from oil pan to intake cover
5.3 engine harness
reflashed 4.3 ECU
all 5.3 accessories (although 4.3 power steering pump & alternator can work)
4.8 (or LS2) flywheel (i have the NV3500 trans)
5.3 engine mounts and frame mounts
5.3 intake tube
5.3 coolant, heater, a/c hoses
fuel line adapter pieces mentioned in the OP
the intake nipple mentioned in the OP (what exactly is that, by the way?)

[banker099]

that sounds like it...not sure on the afore mentioned intake nipple tho