Carburetor Problem

[dardal@xxxxxxxxxxxxxxx]

My black 68 LeBaron has a 750 cfm rochester.  Although this Rochester has some 
issues, the engine pulls real well in all rpm ranges, from 2000 all the way to 
4600-4700.  This car has the HP spec cam, and the torque at over 4200-4500 rpm 
remains real strong.  My green 68 Sedan has an even larger (not by much) than 
the HP cam (based on its observed torque curve) and it has an AVS, which 
appears to be about 600 cfm (it has the spread-bore configuration).  This 
engine pulls real well from the 4000-5000 rpm range, but I think that this 
engine can use a bit more cfm.  Its interesting to see how an Imperial 
accelerates with 2nd gear all the way to 5000 rpm.  The speedo is approaching 
110 mph very rapidly (true speed about 102-104mph) and all traffic that seemed 
to travel at the same speed as you moments earlier, disappears rapidly behind 
you.

I wanted to get the part number off my AVS and ask the list if they can look up 
for me its cfm.  Will do shortly.

D^2, 2x68s, with one with a fresh transmission. 

Quoting Rob P <fristpenny@xxxxxxxxxxx>:

> What did Imperial 440s come with stock? I have heard people on this list
> 
> state that 750 is overcarbed for a 440 before, I can't say I believe it.
>  
> Did you try dealing with the metering rods, etc? I don't have experience
> 
> with big blocks in BIG cars, but I have a '70 hp 440 that came stock
> with a 
> 750 cfm AVS. I don't think they overcarbed it at the factory.  I do 
> understand that for Imperial applications-heavy weight, low rpm cruiser,
> 
> automatic, low numerical rear gears-a smaller carb might be better, but
> a 
> 750 doesn't seem excessive.
> Please don't take offense at this and feel free to argue ;)
> Rob
> 
> >From: "Imperial 59" <imperial59@xxxxxxxxxxxxxx>
> >
> >I would stay away from the 1407/1411.  750cfm is too much carb for our
> 
> >engines. I bought one for my Imperial and was very unsatisfied with it.
>  
> >Top end was great, but low end performance was horrid.  I ended up
> having a 
> >correct carb rebuilt for the car and selling the Edelbrock on ebay.
> 
> 
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