Official NBS 4.3v6 to GEN 3 V8 swap Guide

[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?)