I understand that this web site is for LS1 trucks and cars. I have a 99 sierra 1500 which was bought used. and you know that when you buy something used you don't always have a choice on what you get for options. any ways it has the 4.3L V6 in it.
I have known JSmith for a long time and i was rolling around the idea of either geting a new truck with a v8 or he suggested do an engine swap and i think i am going to go for it.

reason why i am posting here i because i need help as far as the computer goes. Im looking to drop in A 6L v8 LQ9 engine. JSmith has said that my pcm in the truck my except a new engine.

also has any one done a swap from V6 to V8 it should be easy given time. i will also do some tranny work to handel the new engine and increased power.

 

Personally, I would just trade in for a 5.3L truck. I'd mod a 5.3, then save up for a 6.0 down the road if you want more power. All your 5.3 mods would swap over to the 6.0, which would be a MUCH easier swap than a 4.3 to 6.0.

Or you could get a 4.8 truck and swap a 6.0 in it if you dead set on the 6.0 notion. Just my $.02

 

or just put an ls1/ls6 motor?

383 crate motor? oh yea..

 

check out LS1truck.com they have some swap info there and can give input on what you need to fab mounts and any other unknown.

 

I recommended the LQ9 swap because he's still in high school and that he could get into some decent power right away without having to spend a bunch of cash for bolt-ons to get him there. An LQ9 in a RCSB 4X4 would be pretty cool, especially after modding it. I'm fairly certain that you will need a new computer for the LQ9 if you decided to go that route.

Seeing Red Again, those are some good suggestions and we had discussed them as well. There are quite a few options really.

 

I'll never swap another engine in my life if it is not a direct bolt in.

I went from a 4.3L to a SBC 355 in my '92 S10. That swap just about killed me.

I like idea of getting a 4.8L truck and swapping to a 6.0L. Much less headache and in the end I bet it would be cheaper.

swap

John