My K5 Blazer Story.

[justcuz]

Originally Posted by Zoomad75

Since I live in a non-emissions county, no plans on Cats. This system doesn't fire the injectors sequentially, but in a batch fire style similar to the old L98 TPI systems. Based on that, one o2 sensor is enough. The stock style downpipes off the manifolds do have bungs for o2 sensors, but the left side will get a plug.

I wasn't aware ALL LS engines were CARB approved. I know the GM crate Erod engines were, but thought the ruling was the vehicle with the newer swapped in engine had to meet all the requirements of the year of the engine installed. Meaning, cats, evaporative emissions systems and all the other goodies. MEFI for in my form in a 91 probably wouldn't pass CARB's muster. If anybody in CA is looking to do this kind of swap, you need to do the research with CARB to find out what your swap will need to be legal.

Rob,

Here is the kicker, California actually has 3 different smog rules depending on your location, however engine changes fall under one rule.

There is no real way of telling if the engine is an ERod engine or not, (since it is basically a GM pickup 5.3) so as long as your engine conforms to CARB executive order D-126-31 you should be good. You correctly stated it must include all the emissions equipment for that engine including the EVAP and other required emission control items. This would negate the use of the MEFI controller your using for a post 1975 swap in California.

California has changed, in the fact that if your car did not originally have the availability of the chosen engine you cannot swap it into your vehicle.
So no diesel in GMT400 1/2 ton trucks, no 4.6 or 5.4 in your post 75 ford vehicle.
You can install a fuel injected 360 in your 91 Dodge 1/2 ton, but no Diesel swaps until you step up to a 3/4 ton truck.
The GM LS engine to my knowledge is the only engine certified by CARB that you can legally swap into ANY vehicle post 1975.