GMC / Chevy 73-86 Chev 350 Swap Emissions Question

[TRC]

Hey all, I am turning a 1986 K-10 Suburban into a 3/4 ton trail/tow rig. Most of the parts are coming from a 73 K-20 Camper special pickup I bought for parts. I am replaceing the worn out 350 in the 86 subur. with the low milage, rebuilt, higher performance 350 out of the truck. Due to my limited knowledge and ongoing learning, I am under the impression I am going to have to keep all the emmmisions crap on the Subur. to get it to pass E-test and be street legal. I am going to swap the intake manifold and carb to Edlebrock 350-3701 intake and 1806 Thunder Series AVS Carburetor which I am told, will help get the most out of the higher performance engine but still be stock configuration to put all the emmisions stuff back on. Heres the twist and my question, the stock emmisions configuration on subur. is YFC which is a 4-barrel, Low altitude setup. I do most of my offroading in the mountians between 7k & 10k feet. After studing my Chiltons, I noticed the YFF configuration for 4 barrel, high altitude is very similar with just a few vacum hose changes. Question: can I reconfigure to YFF with all of the same/stock emmision control components and same ECM computer, or if not, which coponents and possibly computer, would I need to replace with YFF specific parts. Any help with this little issue would be greatly appreciated.

 

[Corban_White]

As far as I know, the stock emissions stuff only needs to be there to pass the visual inspection. If it is not hooked up they usually don't notice. As long as it can still pass the sniffer.

 

[Tacoma]

Paint the Edelbrock stuff black, too.

 

[TRC]

Reply

I would like to get rid of the emmisions altogether but Ut is pretty sticky about that, when I took my Zuk in for emmisions test I had to use every trick in the book to get it to pass and it was a rebuilt stock engine

 

[Rot Box]

Have you considered a TBI swap? I believe (correct me if I'm wrong) the state allows factory components or newer from a same make vehicle (i.e. 87-95 TBI and emission components from a Suburban).

If you converted to TBI especially with an aftermarket harness you would have far less headache, more efficiency and all the altitude compensation you would need. Just a thought