Quadrajet Problem Solving > Quadrajet Parts and Numbers

17080561 / 1990 Mercruiser 5.7L

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429bbf:
im not sure what kind of tools you have but i use mic. calipers and a nice big set of drill bits . i always measure my bits even if there stamped .ive got a couple different sets i think i bought them from MSC. hope this helps

Ethan1:

--- Quote from: Gmoney on August 21, 2013, 07:21:20 PM ---PS the new tubes are about a 1/4 inch shorter.  I,m notsureof the best approach to measure the opening size.

--- End quote ---

 You can either use TIG rod or MIG wire of different sizes. I also use tip cleaner's for an Oxy-Acetylene torch. Find one that fits snug into the opening and use dial calipers to measure the O.D. of the tip used.

Gmoney:
Guys, thanks for all the help.  I talked to Cliff today and with these marine carbs the idle tubes are smaller . . . . 0.026 range.  So I,ve got a micro drill bit set ordered and will clean the existing tubes and may oversize a couple thousandths as he recommended.  Thanks again.

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