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Old 02-23-2006, 10:44 PM
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Join Date: Oct 2003
Location: Hacienda Hts., SoCal
Posts: 4,345
Arrow tri-power tricks

The only "tricky" part of dealing with tri-pwrs is insuring that the OUTER carb's throttle bodies (the cast iron bottom piece with the shaft and butterflies) are air tight (sealed) or the engine idle will be unsteady and impossible to adjust due to the resulting vacuum leak.

Jon Hardgrove gave me a good idea; hold the carb bases up to the light and see if you can see light around the bores, if so, loosen the butterfly to shaft screws slightly and move the butterflies until you can no longer see light and then retightenthe screws. I would make this visual check, and NOT disturb them if they pass the light test. Vacuum leaks in the outer carbs and poorly adjusted linkage are the primary reasons that many enthusiasts shy away from tri-powers as they think that they are diffucult to live with and to tune.

Les

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'65 Buick Sport Wagon Custom, 340, T350, 3:23
'66 GTO Post/468, 700R4, 3.31 (Mike's as of 9-16)
'68 Grand Prix/455, dual AFBs, T400, 2:93 posi (sold)
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'97 Mitsubishi Eclipse Spyder Turbo, Konis, 5 speed
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