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1966 Mustang 289/306 3spd coupe, 1966 Mustang 289 C4 coupe, 1965/64.5 Mustang 289 4spd convertible
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‘Ever so slightly‘ is no big deal. .020+ is a big deal
To my untrained eye it's minimal and should be ok. I'll have to look at the older one I have, that's the one I'm saving for Ashley's car. It has more sentimental value. :geek:
 

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1965 Mustang GT. 11.898 @ 113.646, all motor, three pedals
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2,167 Posts
Discussion Starter · #145 ·
Ok, so not Denver 😜 I‘d put 64 or 63 primary jets in it. Secondary vacuum spring no softer than plain. If it’s got taller rear gears it might want the brown or maybe even black spring.
 

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1966 Mustang 289/306 3spd coupe, 1966 Mustang 289 C4 coupe, 1965/64.5 Mustang 289 4spd convertible
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Ok, so not Denver 😜 I‘d put 64 or 63 primary jets in it. Secondary vacuum spring no softer than plain. If it’s got taller rear gears it might want the brown or maybe even black spring.
I'll dig into it once I get closer to getting her manifold installed. Thank you for the advice, I need all the help I can get! Got a four hole spacer for my '66. Haven't installed yet. Scrambling to get my dad's car home in the new garage.
 

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1965 Mustang GT. 11.898 @ 113.646, all motor, three pedals
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2,167 Posts
Discussion Starter · #148 ·
I can attest to that. I just went through my 1850 with loose shafts. Idle screws needed to be way out and off idle it was very lean.
Yep, that’s what they do. I’ve bought carburetors that had the mixture screws 3+ turns out
 

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1966 Mustang 289/306 3spd coupe, 1966 Mustang 289 C4 coupe, 1965/64.5 Mustang 289 4spd convertible
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@ArizonaGT this is the one I'm saving for my wife's car. (Unless I cop out and get an Eddy for it) EFI is the endgame, she wants to get in start it and drop it into gear :rolleyes:. Which I know a properly set up and adjust carb will do, but this is the impatient wife we're talking about.
 

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1966 Mustang 289/306 3spd coupe, 1966 Mustang 289 C4 coupe, 1965/64.5 Mustang 289 4spd convertible
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Runner length is the thought I had. Not that important?
Tuning would most likely become an issue, as different runner lengths would possibly demand different tunes but each cylinder would technically have its own carb bore, but get mixed up in the intake plenum.
 

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1966 Mustang 289/306 3spd coupe, 1966 Mustang 289 C4 coupe, 1965/64.5 Mustang 289 4spd convertible
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1,430 Posts
With Weber DCOEs mounted on each side, you would end up with a runner (carb plus that adapter), then a plenum and then again a runner in the rest of the manifold + head. A rather odd configuration.....
In post #126 stacking carbs was mentioned so I figured anything goes! o_O
 
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