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Magazine Feature

Gm throttle body injection article from Trucks magazine


Mercarb® 2bbl Carburetor and Jetting Information

The picture to the right  shows the top cover removed    (8 bolts) to expose the jets.  That's it - very simple!!!!

 

Stock Jetting Tables

   The information we provide below is from information we received from service bulletins.  It does not provide for all years.  When new, all engines are jetted for sea level and it is the dealerships responsibility to re-jet for the altitude the engine is going to be used at.  Because of all these variables, we cannot determine which  jet's you currently have in your carburetor - this is your responsibility.  We provided the below table for comparison's, baseline jetting, and part # information.

Note: the # stamped on each jet indicates the size in mm's.  For example - a 150 stamping would correspond to 1.50 mm.

                                                  

Models Carb. Part# <5000ft  5000-9000ft >9000ft
2.5L / 3.0L 1389-9562A          3310-806077A_    3310-860070A_ 1.45 mm 1.40 mm 1.35 mm
3.0L S/N OF353099 AND BELOW 1389-815396A_   3310-806078A          1.60 mm 1.50 mm 1.45 mm
3.0LX

 

1389-815397A_   3310-805924A_   3310-807504A_ 1.65 mm        1.60 mm        1.55 mm 1.55 mm       1.50 mm      1.55 mm 1.50 mm     1.45 mm     1.45 mm
4.3L, 4.3LX 1389-9565A4       1389-9565A_       3310-806080A_    3310-806972A_   3310-807764A_ 1.65 mm        1.60 mm        1.60 mm        1.60 mm        1.60 mm 1.55 mm       1.50 mm      1.50 mm      1.50 mm      1.50 mm 1.50 mm     1.45 mm     1.45 mm     1.45 mm     1.45 mm
5.0L 1389-9563A_       3310-806081A_    3310-861080A_   1389-9670A_       3310-806082A_ 1.70 mm        1.70 mm        1.70 mm        1.85 mm        1.85 mm 1.60 mm       1.60 mm      1.60 mm      1.75 mm      1.75 mm 1.55 mm     1.55 mm     1.55 mm     1.65 mm     1.65 mm
5.7L 3310-807312A_ 1.65 mm 1.50 mm 1.45 mm

Jet Size(mm)   Merc. Part #

1.30

 1.35

 1.40

 1.45

 1.50

 1.55

 1.60

 1.65

 1.70

 1.75

 1.80

 1.85

 1.90

3302-811849

3302-811850

3302-811851

3302-9050

3302-811852

3302-811853

3302-810923

3302-9058

3302-9055

3302-811854

3302-811855

3302-811856

3302-811857

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