Switching to the first iteration of the custom 2.25-inch primary, 2.375-inch-step airboat headers saw an increase in power and torque to 5,700 rpm. Peak torque increased almost 16.5 ft-lb and occurred slightly earlier, while peak horsepower dropped to 961.6 horsepower.
Adding 12-inch extensions to each primary tube saw almost no difference across the curves, with a slight reduction in peak torque and horsepower values, proving that the initial airboat header design was the best for this engine, especially considering it will probably never see above 5,700 rpm in the real world
Regardless of what it’s in, this engine is an absolute brute and definitely shows what a long-stroke and a lot of displacement is capable of.
As you can see, while the dyno headers made better peak numbers, the custom airboat headers made more power under the curve, and over the whole RPM range the engine will live in, in the real world.
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