The Weiand Street Warrior (PN 8121) is built for Big Block Chevy enthusiasts running 396 and 427 engines with oval port heads. Engineered for idle to 6,000 RPM street performance, this single 4-barrel intake delivers crisp throttle response and strong mid-range torque — exactly what you want in a street/strip build.
Constructed from lightweight cast aluminum, it sheds weight compared to stock iron intakes while improving airflow and cooling. Designed for a square-bore 4150 carburetor, it’s a direct bolt-on upgrade for your BBC street machine, bracket car, or weekend cruiser.
Key Specs
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Brand: Weiand (Holley Performance)
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Part #: 8121
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Engine Fit: Chevy Big Block 396 & 427 (oval port heads only)
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RPM Range: Idle – 6,000
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Port Style: Oval port
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Carb Flange: 4-bbl square bore (4150)
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Height: 4.63" (front) / 6.25" (rear)
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Material/Finish: Cast aluminum, natural finish
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Weight Savings: Lighter than OEM cast iron
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Use: Street/strip, hot rods, muscle cars
Fitment Notes
⚠️ Will not fit rectangle-port heads.
⚠️ For spread-bore carbs, an adapter is required.