The Aluminum "Plumber" L-Panifold is a specially engineered cast aluminum intake manifold for stock 74" (FL) Harley Davidson Knuckleheads '40to '47 and 74” (FL) Panheads ‘48 to ‘54 with stock cylinder height. 74" Knucklehead cylinder height is 5.530" and the stock 74" Panhead cylinder height is 5.330". The overall width of this manifold is 3.568” for the knucklehead option and 3.375” for the Panhead option. These Panifolds are cast in 356 Aluminum and heat treated to T6. The L-Panifold features radius corners and a direction "Y" shape inside. This shape helps the flow and delivery of the air/fuel mixture to the combustion chambers. The overall increase in flow is nearly 25% above the stock design!! The bench flow testing was done by Hasslegren Engineering, a high end race engine building shop. The L-Panifold comes with intake port nuts and brass compression seals already installed. Each manifold is carefully machined with high tolerances to ensure the seal is flawless! The flange will bolt up to any Linkert carb using the standard 4 hole mounting bolt pattern. This product is 100% American made!
Please check out the PCP Insulator kit In this web store that offers a great seal between this L-Panifold and your carb.
If you have a set up that falls between or above or below the size options available please let me know the size you need. I make a custom manifold just for your machine!