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Hey Guys......What's the purpose & function for the intake manifold jet on the 318 eng.

With the carb. removed looking down through the pass. side venturi bore you can veiw this 3/4" hex acorn head jet w/4vents in the bottom of the intake manifold.

I have a 318 that has a vacume leak when cold, that indicates a cracked intake manifold, but that's highly unlikely on the SB V-8 engs. There aren't any on car visible cracks & short of pulling the intake for full inspection I want to eliminate the possibilty of the manifold jet as the vacume leak.

Any comments & opinions are welcomed.........Thanks, Oldwagon2
 
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