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Rochester 4G, 4GC, 4 jet, Main jet Custom Assortment
Rochester 4G, 4GC, 4 jet, Main jet Custom Assortment

Rochester 4G, 4GC, 4 jet, Main jet Custom Assortment

Your Price: $55.00
Custom Assortment
Part Number: 120-11A
Availability: Back Order

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Price includes 8 pairs of jets (16 total). 
Rochester 4 barrel main jets. Used on 4G & 4GC carburetors. Commonly known as the 4 Jet. There are two main primary jets and 2 main secondary jets in this carburetor. 

To correctly determine what jet size you need in your carburetor test the current setup by driving at a sustained speed for 20 minutes, stop, pull a plug and check the color. Gray is perfect, white is too lean and black is too rich. Change your jets, then try the test again.

Thread size on this jet is 28


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