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I have seen lots of information on fuel and ignition curves, but have never heard anybody discuss their interdependence, or lack there of. I want to get serious about tuning my 289. It has a Duraspark distributor hooked to a Jacob's ignition on the spark side and a Holley 1850 600cfm vacuum secondary on the fuel side. Where do I start? Start messing with the carb or the distributor?
 

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Start with the dizzy, then carb, then fine tune the dizzy, then carb.
 

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I agree with Walt. Also, if you really want to dial in your engine, spend the money on a dyno session, and bring some metering rods for your carb with you. If you get things pretty much set to begin with, you could probably get away with two hours worth of fine tuning on the dyno. It's fun and it's worth it.
 

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I agree totally! Chassis dyno that puppy and never worry if you have it right.

Forget the metering rods though. Holleys don't have them. But a few extra jets wouldn't hurt.
 
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