Since you want mileage, the double pumper is the last thing you want.
For a daily driver, I'd recommend the Edelbrock 500 or 600 cfm w/ electric choke and a Performer intake. It's much less maintenance than a Holley and holds its tune. I got a tune when I installed my Edelbrock 600 and haven't touched it in over 3 years
The Holleys I run hold their tunes that long too. When it seems one is "out of tune" the problem is rarely the carb, but an ignition problem causing it.
Ain't that the truth? The first thing everyone wants to blame is the carb. The worse the motor is the worse the carb is going to work, period. But nobody wants to believe their ignition needs work, or the plugs are shot or that the rings are on their way out. It's much easier to blame the carb. Besides, I'd like someone to explain exacly how a carb can get out of tune every few weeks like some guys will have you believe. Do the jet sizes change? Do the idle mixture screws vibrate loose? Those who think they need to constantly mess with their carbs don't have them right to begin with and don't understand how they work, in my opinion. I'm no wizard, but the Holley on my wife's Corvette is better than 10 years old, with no problems, and the pair of Holley 4 barrels on my '68 have proven to not be the headache everyone would lead you to think. In fact, Hearne knows what I mean, he's had at least two street cars I know of with multiple carbs that ran well on the street.
The Holleys I run hold their tunes that long too. When it seems one is "out of tune" the problem is rarely the carb, but an ignition problem causing it.
Yeah but do they go that long without leaking? Both my Dad and my brother in law gave up on fixing the leaks in their Holleys and switched to Edelbrocks...they are both very happy.
Ain't that the truth? The first thing everyone wants to blame is the carb. The worse the motor is the worse the carb is going to work, period. But nobody wants to believe their ignition needs work, or the plugs are shot or that the rings are on their way out. It's much easier to blame the carb. Besides, I'd like someone to explain exacly how a carb can get out of tune every few weeks like some guys will have you believe. Do the jet sizes change? Do the idle mixture screws vibrate loose? Those who think they need to constantly mess with their carbs don't have them right to begin with and don't understand how they work, in my opinion. I'm no wizard, but the Holley on my wife's Corvette is better than 10 years old, with no problems, and the pair of Holley 4 barrels on my '68 have proven to not be the headache everyone would lead you to think. In fact, Hearne knows what I mean, he's had at least two street cars I know of with multiple carbs that ran well on the street.
AMEN TO THAT BROTHER!!!!!!!!!!!!!!! If he wants mileage as well as perfomance, the LAST thing he wants is a double pumper Holley. .............................................Intake? Here's my list to choose from: Ford Racing A321, Weiand Stealth, Edelbrock Performer RPM (reg or airgap) or their older F4B (same intake as the Ford A321, Shelby Cobra and C9OX) These all work as well on the bottom end as the Performer (or stock 4 bbl iron intake) but give you room to breathe up top.
Yeah but do they go that long without leaking? Both my Dad and my brother in law gave up on fixing the leaks in their Holleys and switched to Edelbrocks...they are both very happy.
An AIR-GAP????? on a STREET CAR????? Talk about mis-matched components! Performer RPM....you bet....1500-6500 rpm manifold....needs a 6500 rpm carb. But an AIR-GAP??? Pitiful cold engine/weather driveability...seen it and I live in S.C.
My 289/tri-y/Cobra (F4B)/Fireball-I/3.25 axle 65 with the 650 dp returned 16/21 with BFG 215/60 Euro T/A's. Plus it would eat a 79 turbo Trans/Am's lunch.
ALL your parts need to be built for the SAME rpm range. Period. Start putting an AIR-GAP manifold on your car with a 500 cfm carb and see how a 4400 rpm carb goes with a 7500 rpm COLD air manifold. .
Yea, Air Gap. It's not that different than an RPM or anyother dual plane high rise intake. As for it staying "cold" that's a tool of advertising campaigns. Once the engine reaches operating temps, the intake does as well. It's also plain here you've bought into the "matching parts" preaching the aftermarket companies do. Sure, there are SOME parts combos that don't work (like a Vic Jr on a bone stock 82 Crown Vic 302) but there are lots that do work together. Most carbed engines have some sort of cold weather driveability issues too, an Air gap RPM with a small carb will, just as well as one with a Performer 289 intake under it to some extent. Dual plane intakes are simply not as sensitive to the rpm range as a single plane is, I've run enough of em to know this to be true. As for eating a 79 Turbo Trans Ams lunch, that aint a tall order by a long shot.You matched a 1,000 lb lighter car with twice the torque output of the T/A and you really think that's impressive? What was the list number of your "Double Pumper" Holley?
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