Spread Bore Carb
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More Turbo
Joined: Dec 1999
Posts: 582
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From: New Orleans United States
Spread Bore Carb
I keep reading about how the 600 - 650 CFM spread bore carb is the ticket for these engines. Is there one made to bolt to a square bore manifold, or is everyone using adapters along with the carb?
I am running the Holley 750 right now, and the only time it shows that its oversized is under 1200 RPM, after that, you can feel the secondaries open up, the whole exhaust note changes, and you fly past that Honda that thinks its quick. A quick Honda is an oxymoron, they should be referred to as "peppy" as my friend put it.
I am running the Holley 750 right now, and the only time it shows that its oversized is under 1200 RPM, after that, you can feel the secondaries open up, the whole exhaust note changes, and you fly past that Honda that thinks its quick. A quick Honda is an oxymoron, they should be referred to as "peppy" as my friend put it.
Lead Driver
Joined: Nov 2000
Posts: 6,635
Likes: 349
From: Albuquerque
Spread Bore Carb
I've tried running a Quadrajet on mine and it choked it to death. I'm sure you could make it work but it might need some expert modifications. I also found that a 750 square bore worked better for me that a 650, The smaller carb had to be opened up to idle past the transfer slots to provide enough air.
Bear Tracks
Bear Tracks
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Joined: Aug 2000
Posts: 8
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Spread Bore Carb
I have a 750 quadrajet on my 400. It is on an edelbrock performer manifold with an adapter. If you can tune it, go for it. Throttle response is awesome, it idles nice and low, and I pull about 13 mpg before I correct for the tire size. And that is when I am stomping the go pedal.
Senior User
Joined: Apr 2002
Posts: 406
Likes: 1
From: cedar rapids usa
Spread Bore Carb
>I am running the Holley 750 right now, and the only time it
>shows that its oversized is under 1200 RPM, after that, you
>can feel the secondaries open up, the whole exhaust note
>changes, and you fly past that Honda that thinks its quick.
>A quick Honda is an oxymoron, they should be referred to as
>"peppy" as my friend put it.
My personal opinion is that these engines love the bigger (750 cfm) carbs. To get better responce, and fuel milage, install Holley's "dog leg" venturi boosters in place of the standard straight style. The desgin of these booster increase the vacuum signal below 1500 rpms, allowing the eninge to get a better flow of fuel.
Senior User
Joined: May 2002
Posts: 375
Likes: 0
From: nc
Spread Bore Carb
q-jet... well i would be afraid to make that statement. i like the holley square bore 4160's i'm not saying that they are the best only saying that i like them the best. if your engine is stock with the single exhaust kinda a thing. go small with the carb choice regardless of manufacturer. i like the holley for the ease of tuning and the vacuum secondaries are really easy to taylor to your needs. 
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