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This is a "long" intake for the GX390 or big block style carburetors, unlike any other market intake. We made this to resemble the length used by our Tillotson carburetors. If you want a tighter fitment, we also make a "short" intake part number 474INT.
Designed and CNC machined to match each unique intake port shape precisely at the block or cylinder head entrance. (May vary on head type and model)The resulting action is no turbulence causing misalignment and much better control of the entire intake tract's laminar flow. By using the Tillotson carburetor, we can create the best angle through the port. The 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, it's difficult to test the theory, and your gains may be minimal.