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Speed Secrets: ZEX 125 Shot Dyno Test On a Small Block Ford

Can you turn your car into a superhero? Not in a traditional way, but with the use of nitrous, you can give your naturally aspirated engine super powers. In this episode of Speed Secrets, the team shows you exactly what happens when you install nitrous on a 392 cubic inch Ford engine.

Before getting to the engine test, it’s important to understand how nitrous works first. Nitrous oxide is composed of two elements, and the name suggests – nitrogen and oxygen. When sprayed into the engine and subjected to combusted heat, nitrous then breaks down into these components. What really adds the power is that extra oxygen.

Now back to the test engine, the 392 engine is a stroker 351W with aluminum heads and a single plane intake. It also has an aftermarket COMP Cams camshaft, the XE274HP cam with a .555/.556” lift, a 224/232 duration, and 112 LSA. COMP also supplied the hydraulic roller lifters, valve springs, and double roller timing chain. Everything was buttoned up with a set of aluminum rocker arms.

With everything assembled, it’s time to hit the dyno. Without the help of nitrous, the engine made an impressive 479-horsepower and 506 lbs-ft of torque. With the baseline established, a ZEX Perimeter Plate kit is installed. This is a great kit because they are designed with 12 equally spaced slots to ensure an accurate amount of fuel and nitrous to each cylinder. The jetting installed makes it a 125-horsepower shot kit.

On the dyne, the nitrous kit flexes and gets the engine up to 610-horsepower and 649 lbs-ft of torque. Another test to prove that nitrous can’t be beat on naturally aspirated engines!

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