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What is an NPT fitting? NPT stands for National Pipe Taper. NPT fittings are used in many different applications, such as: The threads on an NPT fitting are tapered. As the fitting is tightened, the threads compress. These "smashed" threads seal the connection. Because of this, the use of Thread Sealant is highly recommended.
What is an AN fitting? AN stands for Army-Navy. The size specifications were established by the military back in World War II. They were originally used in the aerospace industry. AN fittings use a 37 degree flare as the sealing surface. DO NOT use AN fittings with different flare-type fittings. This will cause leaks and damage to the fittings.
When using aluminum and steel fittings, use the torque for the aluminum fitting. For best results, torque to the low end of the torque range. If it leaks, tighten it until the leak stops (without exceeding the max torque). Lightly lubricate the threads and sealing surfaces with oil before assembly. Avoid dry assembly whenever possible.
A lot of aftermarket pumps will list the required line sizes. If your pump does not list line sizes, use the table below as a basic guideline. Recommended Fuel Line Size (from the tank to the pump) Engine Output. Size (inches) Size (AN) 350 hp or less. 5/16 in. -5.
PTFE Lined Hose is the best soft hose you can use and generally has a braided stainless or braided nylon exterior. The PTFE liner blocks fuel vapors and slows the degradation process. PTFE Braided Hoses require Special Fittings. You cannot use a standard AN fitting with this hose. It’s also less flexible than standard braided or rubber hose.
Initial Steps - Installing Pieces and Parts. Install checking springs on the #1 cylinder valves. If using solid lifters, place the dial indicator directly on a solid lifter. Install the camshaft and timing set according to manufacturer instructions. Install the degree wheel on the crankshaft. Attach the pointer to the block.
Exhaust Parts Sizing. Views: Most exhaust parts are made so they mate up easily. Usually, one piece will slip inside the other. This creates what is called a “lap joint.”. In this case, the joint can be clamped or welded to seal it up. Some parts will list the Inside Diameter (I.D.). Others will list the Outside Diameter (O.D.).
250 lbs./hr. ÷ 6 = 41.67 gph. A liter of fuel weighs about 1.6 lbs. To get lph divide lbs./hr. by 1.6. 250 lbs./hr. ÷ 1.6 = 156.25 lph. You need the minimum flow rate at your fuel system’s operating pressure. For Carburetors, this is between 4-7.5 psi. Fuel Injection will usually be between 35-65 psi.
The aluminized coating will protect the metal from rusting. However, if it is scratched or damaged, it will allow the metal to rust. Areas that scrape over a curb or get dinged by rocks will rust just like mild steel. Welded joints will rust as well. A common problem with aluminized steel exhaust is rusting from the inside out.
Views: Exhaust Headers are one of the best performance upgrades that you can make. They improve Torque, Horsepower, and fuel economy. Stock, cast iron manifolds are heavy and rust quickly. They also force exhaust gases into a single chamber. This creates backpressure in the exhaust, making it harder for the engine to breathe.