Holley 37-474 2 Barrel 500 CFM Rebuild Kit
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Q & A
What's in the Box
Each Holley Renew Kit carburetor rebuild kit contains all parts and gaskets that are necessary to restore “like new” performance to your carburetor. Detailed instructions are also included to guide you through the rebuilding process. Start off the season with a quality Holley Renew Kit repair kit. It's your guarantee for trouble–free cruising.
Fits Holley Model 2300 500cfm two barrel carburetors ONLY.
- Pump Diaphragm
- Needle & Seat
- Power Valve
NotesThis rebuild kit will service the following Holley Carburetors
R4412 R4412-1 R4412-2 R4412-3 R9011 R84412
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Seals between air cleaner and standard 5-1/8" air horn. Prevents dirt from entering your engine. This reusable Speedway gasket has stainless steel ring embedded in durometer-tested neoprene rubber. Won't collapse, tear or lose its shape.
Holley accelerator pump diaphragms are available in 30cc (427-1355) or 50cc (427-1357) sizes. For use with gasoline only.
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Percy's Adjust-A-Jet fits between the carb body and metering block and has needle valves that let you infinitely adjust the effective fuel jetting - even with the engine running.
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These kits are ideal for a quick refresher of your two barrel Holley carb. Each kit includes step-by-step instructions and a detailed tuning guide.
Kit includes one 30cc and one 50cc accelerator pump (black material for gas) and one 6.5 power valve.
427-371543 Instructions (PDF)
Bolt to the base of your carburetor so you can work on it without damaging the throttle assembly.
- 5/16”-18 threads
- 1-1/2” tall
- Set of 4 (nuts included)