RE: Tuning issues
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RE: Tuning issues



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I've already learned as much about carbs just today as I already knew! 
Thanks guys.
Jeff
Brian Schlump wrote:
> 
> I've used the Mopar 509 cam on 2 different engines: '69 - 413 low 
> compression engine, and '64 Max Wedge.  Both engines run 4 speed 
> transmissions.  My friend has the 509 in his 383 Magnum engine with 
> Edlebrock aluminum heads & a 4 speed.  He runs a Holley carb and 
> typically runs 5 - 6 inches of manifold vacuum.  My cars have run 
> anywhere from 5.5 - 7 inches.
> 
> I used to run the 484 Mopar cam in a 440 GTX and I had to drill a 1/16" 
> hole in the front throttle plates of the Holley carb to close the 
> throttle plates past the part throttle slot.  This allowed me to get a 
> better idle mixture screw adjustment (which might be part of your 
> problem).  
> 
> When I put the 509 cam in my 426 last year, I was having similar 
> problems adjusting the Carter carbs at idle. Another problem was that 
> the engine was idling at 1,500 rpm while I was driving it, even though I 
> 
> would adjust it for 1,000 rpm in the driveway.    Don D. helped me with 
> the idle problems by suggesting that I drill a hole in the front 
> throttle plates on those carbs, just as I had on the Holley.  I used the 
> 
> 1/16" drill on those, and then the idle mixture screws did what they 
> were suppose to do, and I had no more of the fast idle while driving.    
> 
>  
> 
> 
> '64 Belvedere
> Woodstock, IL.



Jeff Adams
64 Polara

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