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Discussion Starter #1
I have 2 of my 69's have 468's, virtually the same except one has a single plane holley intake and the other a high rise Wiend intake with a 850 DP holley, the single has a 750 FA holley. My buddy said I would get better performance matching the carbs with the intakes and I should switch them.
The single has a 342 gear the other 308, both 4 speeds. Thoughts????
 

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Your buddy is full of it.
 

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I'm aware of "port matching" on heads and intakes.. Haven't heard of "carb matching" really. I might have to go with Gbauer on this one, unless someone can shed some light on this.
 

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I'm guessing 750 VS (keys are close to FA). High rise (guessing again) means dual plane. So yes I'd switch.

850DP single plane 3.42 gears
750VS dual plane 3.08 gears

May not matter but it makes more sense.
 

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Generally, most people will say the DP should go with a single plane intake and the Vacuum Secondary should go with the dual plane intake. This would seem to matter more in a vehicle with an automatic transmission, and depend primarily on stall converter speed. ..Other variables (gearing) would also apply to a degree.

I'd be interested in how much it really mattered in very similar vehicles, with manual transmissions.
 

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Discussion Starter #7
The VA, Vac. Advance, sorry not FA. The theory is the higher the carb on the intake the fuel atomizes better needing less fuel and the opposite with a flat or lower intake. Fuel injection engines use this theory. My buddy raced 69 Camaro SB for years and found this to be the case. The 750 increased speed in an 1/8 mile from 98 to 107 mph over the bigger DP. Who knows?
 

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I am not sure it is about the carb as it is the intake if you have lower performance level vac readings. Presuming you do, the Wiend is going to want more RPMs to get a good steady shot of air down to the cylinders at launch and will perform at the higher RPM band overall. So I'd pair it with the steeper gears though your gears are not much different either. 3.73s or 4.11+ you will definitely the mechanical preference. Secondly given how the hi-rise would want to run best as described it should be matched to a motor that builds power further up the RPM curve too.
 
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