Which is going to produce more emissions:

'84 2.8L V6 2bbl, non CC, EGR & AIR... poorly tuned (passed DEQ)

OR

Same vehicle with '87 305 LT1 Cam, Cat, NO EGR/AIR, Headers, edelbrock 600CFM Carb.


Think I can pass the sniffer with the V8 and no egr/air?

 

EGR only affects a smog test if they run your car on the dyno fast enough for the computer to activate EGR.

A properly tuned engine should put out lower emissions than an improperly tuned motor... check your catalytic convertor, too. If it's old, the pellet bed might be shot, and it might not be converting as well as it could.

A few years ago, Hot Rod ran a cat test; they used an aftermarket high-flow cat, a NEW factory cat, and no cat for a couple dyno/emissions runs. They found out that between the aftermarket high-flow and factory new cat, they only lost 1 HP. The GM cat was able to clean up the emissions much better then the aftermarket cat was.. something like a 3:1 ratio better!

So the point of all this is, if you can't pass with the v8 motor, try putting on a new GM cat. 'Course, it'll run you around $300, but it might lower emissions more then your old factory cat or a new aftermarket cat.

 

I will be running a catco 3" cat, from my '85 IROC. It had about a year on it before the car was totalled. I figure the exhaust shop will have less trouble putting the y-pipe up with a cat *trouble legally* that is.

I think it should do fairly well, being it's going to be very tuned. I've heard v6 put out worse emissions than v8's.