This multi-point fuel injection intake manifold converts a big block Chevy from carburetion to EFI, computer-designed and dyno-proven for more horsepower and torque than other EFI manifolds. It's built for oval port heads with a 4150-style throttle body flange.
Specifications:
- Engine: Chevy Big Block V8 (396, 402, 427, 454, 502)
- Basic Operating RPM Range: 3,000-7,500
- Flange Style: 4150 Square Bore
- Cylinder Head Port Shape: Oval
- Port Dimensions: 1.87" H x 1.60" W
- Deck Height: 9.8"
- Finish: Natural
- Construction: Cast Aluminum
- Vacuum Ports: Yes
- Height: Front 5.96", Rear 5.96"
- EGR Provisions: None
- Includes: Anodized, laser-etched fuel rails and two sets of mounting brackets (1.48" or 2.56" O-ring to O-ring injector lengths)
- Part Number: 300-561
FAQ
What heads does the 300-561 fit?
Oval port big block Chevy cylinder heads, with a 4150-style throttle body flange.
What comes in the box?
Anodized, laser-etched fuel rails and two sets of mounting brackets for 1.48" or 2.56" O-ring to O-ring injector lengths.
Does it have EGR provisions?
No, this manifold has no EGR provisions.

