Join Date: Jun 2009
Location: Saipan (!)
Mad Max is offline
Re: 2.8 to 3.4 Conversion or Swap Advice Needed
Since you have an 88 Blazer, the swap is a lot easier. You can find a good 3.4 out of a Camaro / Firebird for under $1000 that will be almost a bolt in. Since the Camaro 3.4 and your engine both have serpentine belt accessory drives, it's a matter of unbolting your accessories (Alt, A/C, PS, pulleys) along with brackets and installing on the 3.4.
Also - the 2.8 oil pan has to be installed on the 3.4 even though they look similar. How do I know?
Motor mounts will also have to be exchanged.
The main issue: carb or injection.
Carb is easiest, but will add an extra cost to the swap. The problem with the TBI is it will run very lean and not provide full potential for the 3.4. Guys generally install a 4.3 TB and open the intake ports to 2 1/16".
If you have everything you need (which is never) you could do the whole job in a weekend.
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.