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Reply to "Weber Carbs, timing advance"

An hour on a dynomometer seems the most straightforward way to sort out such an engine. Before arriving, inform the dyno operator what you're aiming for- driveability, mileage, acceleration etc. and bring a handful of springs and weights for your particular distributor, and maybe a good timing light. Marking the flywheel thru the bellhousing opening and timing off #8 cylinder can simplify setup if your firewall upholstering has not been cut. I recommend always carrying a 5 lb gaseous fire extinguisher for the inevitable Weber carb fires. BTW, I LIKE vacuum advance on street cars and Ford (maybe Mallory, too) vac adv is easily tunable with a rubber connecting hose.

So even though you're focused on the ignition, carb issues will certainly obscure any such results and the darndest things affect how they react. Webers tend to split issues: either lots of power and mileage in the 10-12 mpg range, or decent mileage & driveability and no power. If you've been running Webers for awhile, you know there are 5 jets and 2 air bleeds per barrel  in most Weber carbs, and it's easy to get lost. Fuel & ignition problems have much the same symptoms. If you're lucky, the 'mature' dyno operator may be familiar with Weber problems and have a collection of jets etc. Maybe only an hour on a dyno is optimistic.... Good luck.

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