97rs4life

iTrader: (15)

Alright, my brother has a 99 firebird with the 3.8l engine. We are looking to do a ls1 swap into it and just trying to figure out our shopping list and what is needed to complete it.

Here is the list we compiled so far from reading other swaps:
LS1 Engine and Transmission
LS1 PCM and Wiring Harness
LS1 K-Member and Motor Mounts
LS1 Radiator
LS1 Coolant and Heater Hoses
LS1 Steering Rack and Linkage
LS1 Throttle Cable

Now is the radiator different between manual and auto ls1s? We are doing an auto trans with the ls1. Also couldn't we just keep the 3.8l radiator and fans, or is the ls1 setup bigger?

Steering rack and linkage wouldn't be needed from what I read, some people do it for the tighter turns but the v6 one should be fine correct?

anything we are missing on the list?

97rs4life

iTrader: (15)

did some researching and found some info out about the setups. Looks like the fans would not need to be changed and finding a 99 ls1 setup for his 99 3.8l car would be the most direct plug and play swap.

97rs4life

iTrader: (15)

bump, any other inputs or suggestions about doing the swap?

hpmotorsports

iTrader: (5)

looks like you have everything you need, it is a easy swap, find a wrecked donor car 99 up

01CaMMMaro

iTrader: (25)

get 97 vette fuel rails so you dont have to put new fuel lines in... gotta do the fuel pump as well though.

99NMB

iTrader: (7)

you are gonna need the v-8 exhaust, and unless you want to do huge 1 tire burnouts, you should get the v8 rear end...

97rs4life

iTrader: (15)

have a rear end from an SS already, dad owns a shop that does exhaust work, no biggy there.

97rs4life

iTrader: (15)

the 99 ls1 rail won't work with the 99 3.8l lines?

Walbro 255lph was planned for the pump, but the fuel pump assembly itself should be interchangeable right?

G-Body

iTrader: (4)

The 3.8L has 2 lines at the rail, a feed and return. The 99+ LS1 uses a single line rail, the regulator is before the rail. The 97-98 vette rails have a feed and return and will plug right into your lines. The newer LS1 fuel rails will require you to put a regulator on before the fuel rail.

TheAntiRice

you will also need a relay harness to make things go smoother ..also some v8 springs for the front car will sit a bit lower with v6 springs .. its fairly easy i did this in 3 adays alone on the side of my house

My90Iroc

iTrader: (26)

I'm doing a similar swap. Do we need just the ls1 throttle cable or the whole pedal assembly?