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Old November 20th, 2008, 06:05 AM   #11
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Originally Posted by bigblockford79 View Post
I only pull about 13-15" of vacuum @ 850 rpm on my 5.0 HO. If the engine in question has a different cam than factory it may produce lower vacuum without a leak.

Did anything change with the carb/engine during the swap besides the sheet metal that surrounds it? How long did it set before the swap was completed? If it sat for a while it may have gummed one of the primary jets or need valves a little. Float height might also be an area of concern, even if it ran good in the other vehicle, its new home may have a different slope to the intake and might make the previous float level too low.
dose have a slightly larger angle.
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