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You must have JavaScript enabled in your browser to utilize the functionality of this website. Click here for instructions on enabling javascript in your browser. will install a Heli-Coil Thread Insert on your 5/8"-20 inlet 4G / Four Jet Carburetor.

5/8"-20 Inserts are installed on:
Rochester Four Jet (4G) Carburetors

We do not tap inlet threads by hand at All fuel inlet Heli-Coil thread inserts are machined on our milling machine. has built dedicated mounting fixtures on our DRO milling machine to insure the installed inlet threads and sealing gasket surface is concentric. After installation, every thread insert repair is pressure checked to verify a leak free installation.

Normal turnaround time is 2-3 days.

Customer Instructions:
After ordering a service. Ensure that ALL gasoline is drained and evaporated from casting. Wrap up your carburetor bowl cover with lots of packing material to protect the fragile casting. Ship your Rochester Carburetor casting and a copy of your online order receipt to:
36 Mount Pleasant Road
Columbia, NJ 07832

Please note that not all carburetor inlets can be repaired and we cannot guarantee a successful installation as some castings inlet threads are just too damaged to allow a successful repair.

NOTE: Send only the carburetor casting that contains the fuel inlet threads and remove all internal/attached components. Complete carburetors sent will be charged an additional $20.00 for dis-assembly.

NOTE: All 5/8" inlet Rochester carburetors use a gasket on the outside of the threads (Directly below hex area on inlet fitting to make an effective seal) If your carburetor has a hole drilled thru the fuel inlet threaded area, an additional (extra cost) repair will be required to seal the hole with an aluminum plug.

For Rochester 4G carburetors.

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