Weiand Street Warrior Intake Manifold – BBC 396/427 Peanut Port, Idle–6000 RPM

The Weiand Street Warrior (PN 8121P) is designed for Big Block Chevy 396 & 427 engines running peanut port heads. Perfect for budget street builds, tow rigs, and trucks, this single-plane aluminum intake delivers strong low to mid-range torque right where you need it for street performance and reliability.

Built from lightweight cast aluminum, it sheds weight versus factory iron intakes and helps improve cooling. With a square-bore 4150 carburetor mounting pad, this manifold is a simple bolt-on upgrade for mild street/strip setups or workhorse applications.

 Key Specs

• Brand: Weiand (Holley Performance)

• Part #: 8121P

• Engine Fit: Chevy Big Block 396 & 427 (peanut port heads only)

• RPM Range: Idle – 6,000

• Port Style: Peanut port

• Carb Flange: 4-bbl square bore (4150)

• Height: 4.63" (front) / 6.25" (rear)

• Material/Finish: Cast aluminum, natural finish

• Weight Savings: Lighter than OEM cast iron

• Use: Street/strip, tow vehicles, budget builds

Fitment Notes

⚠️ Will not fit oval-port or rectangle-port heads.
⚠️ Spread-bore carbs require an adapter.