I am putting a new motor in my 86 firebird S/E all stock 2.8L multi port fuel injected And was wondering what v6 would be best I was thinking about putting in a 4.3L in is this a good decision I want the most bang for my buck and would a 4.8L mount up with my stock transmission.

 

A 4.3 is not a good idea, it is basically a 350 that is missing 2 cylinders. A lot of work is involved to install one, basically a V8 swap.

To keep things simple stick with the 60 degree V6 family. Such as another 2.8 or a 3.1 or 3.4.

 

Alright I appreciate it probably going to go with a 3.4 any specific year that I should get and will it mount up to my stock transmission and will I need to get a 3.4 ecm what all would I need to change for the 2.8 to 3.4 swap

 

Nothing special between years, The 3.4 can be found in 93-95 fourth gens. To swap it in your car, just swap the intake between your 2.8 and 3.4 and also the injectors. Everything else will obviously be plug and play

 

Thank y'all have been really help for I got nervous at first because there are now tutorials and really hard to find any walk through on it just mostly v6 to v8 engine swaps so I appreciate it soo much and love my third gen

 

Keep loving it man! I put 6k miles on mine from May to September. They are such a blast to drive. Keep the service up to date and the big projects for the winter.

 

I did the 3.4 swap and it is definitely worth it. There are a bunch of old threads (look for KED85's 3.4 Swap Boogie thread) that will give you pretty much everything you need to know. It's pretty straight forward though.