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  5. 420INT EC Intake Manifold 1.125" HL to GX390/420
420INT EC Intake Manifold 1.125
420INT EC Intake Manifold 1.125" HL to GX390/420
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420INT EC Intake Manifold 1.125" HL to GX390/420

Part Number: 420INT
Your Price: $41.99
Availability: In Stock.

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Description

420INT EC Intake Manifold fits 1.125" HL Tillotson carburetors to GX390/420 Honda/Clone/Predator GX390, 420, 440, 460. 

This small carburetor is to limit airflow while gaining adjustability for spec 420cc kart classes. We highly recommend using our X380-7 Intimidator carburetor. Our 3-piece shaft and unique design give you the most flow from a 1.125 bore carburetor. Since the Intimidator is designed by EC Carburetors we offer a better-tuned fuel circuit specific to the engine to make the most power and best tunability vs the Tillotson HL-380 which were designed for open flathead engines. 

Designed and CNC machined to match each unique intake port shape precisely at the entrance of the block or cylinder head. (May vary on head type and model)The resulting action is no turbulence causing misalignment and much better control of the laminar flow in the entire intake tract. By using the Tillotson carburetor we can create the best angle through the port. Pulse hole is precisely located for increase pumping action at high RPM. All installation hardware included.

If you are looking at the length of the intake as a way of port length tuning for the engine there are a few things you need to know. The Tillotson carburetor, being a diaphragm pump carburetor, needs a good vacuum or pulse signal from the intake. If you make your intake too long then you lose signal to the carburetor and potentially hinder its tuning and performance. Tuning your port runner length is more of an exact science than many realize and simply adding more length doesn’t always net the gains you want; where you want. Your carburetor, head ports, and cam timing as well as where you want your engine to gain are all part of the science of port tuning. Unless you have the equipment, time, and money its difficult to test theory and your gains may be minimal. 

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