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Basically my car has been operated only Idling depending on how long sometimes it takes to Idle.That simply is no fun!!Last time I took it out on the street was when I picked it up from my local...

[QUOTE=DennyW]I like vacuum secondaries on the street. 422, 3.91 gears, 28" tires, 780 Holley, 15 mpg. 3900 pound car. Put the 850 on, which is modified, and I get 10 maybe. I just can't keep my foot...

I could try a vacuum secondary but I want to make sure first that with a new choke and some adjustment's first that Im not going to waste my money.I'll keep that in mind though.I think 10-16 MPG for...

Thats interesting and I will keep that in mind when I attempt to get it running in the next few day's.

I do have the 4 idle air mixture screws.I think this Carb is very touchy but it has run good in the past on the street,never good with the Nitrous though.I never tried hooking up a vacuum gauge to...

Thats probably the only thing thats going to help me is a choke.Taking 10 minutes to Idle is ridiculous.I can go out and buy a new Carb but I just will have the carbon fouling of my spark plugs...

The one thing I don't have is a choke on the carb.I wouldn't think that would matter on a 90 degree day though.Im afraid to take it out on the road until I can get it Tuned and Idling correctly.I...

I never really worried about gas mileage until these 2 last years.Only because this is not meant to be a race car.I would like to think I could get at least 10mpg with a 402 BB but with the rather...

Well I don't no exactly what all they did to the(650DP to flow 780) Carb other then put a 4 corner Idling Circuit, because it was many years ago.I have tried 2 Holley Double Pumper Carb's but...

Even though I have stock ported oval port head's the car makes good power from 2500 to 6000 RPM'S.I think though that this Cam could be killing my gas mileage and today that's somewhat important.I...

I should have got opinion's before putting a 248/248 Cam in my 402 BB.I just thought the bigger the Cam the faster the car would be.(inexpierence i guess)

I was wondering if you were running a big Cam with the Double Pumper Carb??

I was also wondering when you said how bad your gas mileage was??How many MPG did you average??Your engine and combination seems very similar to mine.

I don't have a choke on mine.Looking back now I should have stuck with a Cam that would work nice with a 3:73 Gear.Maybe a set of Aluminum heads would make up for a smaller Cam and the lower 3:73...

This Carb was originally a 650 Holley DP.For years and years of tuning I got nothing but instant fouled carbon spark plugs.I must have gone through 100 sets.I finally went to a local speed shop and...