Indy Cylinder Heads Exhaust Port Flange
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Here we can see how the Indy exhaust port flange is 1/2 inch further out than the stocker. The manifolds or headers will sit outward 1/2 inch (another reason why custom headers are needed). Keep in mind the Indy exhaust ports are much more efficient at exhaling the waste to deliver more horsepower through fewer pumping losses. View Related Article
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