Thread: Would it work?

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Lets say that I took GMPP's 350HO crate engine, pulled the cam and replaced it with an emissions friendly cam (Edelbrock's performer cam), and threw on the EGR Vortec intake with a Carter AFB emissions carb. Would this pass an emissions test like a block with the Edelbrock Performer heads and Performer intake? I figure it's not that much trouble to throw the original cam back in after passing emissions if I put on a 3-piece timing cover.

i'm with denny on that.... my buddy used to have a ranger he put a 5.0 in... when ever smog test came, he just swapped back in the old 2.3 that had about 50 miles on it and it passed like it was brand new

Well, that was a thought. But, the engine that's in there now is pretty run out (I had to try 4 times before it passed emissions). Also, I don't have a place to be swapping the engine at my convenience. I'm still not sure where I'm going to take my car to swap the engine out when I get it built up.... But, I could just manage to pull the radiator and swap out the cam without my neighbors complaining TOO much (the curse of living in a neighborhood with strict covenants).

What is your emissions criteria? I used a new Vortec 350 engine assembly with an Edelbrock performer, Jet-built Q-jet carb and a ZZ HEI and the thing zeroed both hydrocarbon tests and zeroed one CO measurement and had ..01% on the other. This was with headers and a single GM cat.

Your state probably has different criteria for different year vehicles. A new engine (after initial burn-in) may do pretty well.

On another vehicle, I was able to rejet the Holley to pass....didnt run it that way except to the emissions test and back.

mike in tucson

running a slightly hotter thermostat can make an engine pass emmisions, lower CO's when hotter.

Mike,

I'm not sure of the numbers, but my state requires existing emissions equipment remain, so I have to keep the EGR on it. I haven't seen that Edelbrock makes a Vortec Performer intake with EGR.

So the cam that came in the 350HO passed emissions with that low CO and hydrocarbons? I was led to believe it was too large a cam to get that low on emissions.

Mark