Above: Modified Cast Iron Corvette Exhaust Manifolds.
Photo comparing 2 ports. On top is the modified port opening. Bottom photo shows the stock port opening.
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Left Side Corvette Manifold
4 to 8 horsepower gain with the our Modified Manifolds
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Right Side Corvette Manifold
Port openings on our Modified Manifolds are opened up to match a Fel-Pro #1404 exhaust gasket.
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