There is no smog stuff with the possible exception of spark retard or lean
carb jets that will affect performance. The EGR valve mixes exhaust gasses
into the incoming fuel air mix and slows down the rate of combustion. Kinda
like a higher octane fuel might do. If you remove it, the engine will
probably have to have the spark advance retarded to keep it from pinging
when the engine is fully warmed up. There is no power robbing things like a
smog pump that is engine driven. The double charcoal canister system on the
California coaches just recycle gasoline vapors from the fuel tank and carb
float bowl back into the intake tract. Better to burn them there where it
might possibly make a tiny bit more horsepower than to vent them to the
atmosphere where we have to breathe them and have them help create smog.
Jim Hupy
Salem, OR
78 GMC Royale 403

On Mon, Feb 2, 2015 at 1:24 PM, Robert Mueller
wrote:

> Scott,
>
> I am of the opinion that if you removed all the California emissions
> control "stuff" you wouldn't feel any seat of the pants
> improvement, you might see it on a dyno.
>
> Johnny,
>
> Also there are specific part numbers for California carbs.
>
> http://gmcmotorhome.info/engine.html#carb
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
>
> -----Original Message-----
> From: Johnny Bridges
>
> I >think< about the only difference on my '76, which was a CA coach
> originally, a second vapor cannister in series with the first
> one, and a thermo switch on the distributor vacuum plus a slightly
> different carb - it lists under a different number. I can't tell
> any difference in how it drives or the mileage from the 49 ones. After
> 76, there may be nore difference. Any of the gurus know of
> anything else different on a '76?
>
> --johnny
>
>
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