Long-primary headers deliver increased torque and horsepower to Chevy 18° powered IMCA/UMP Modifieds. Headers includes 1-3/4" to 1-7/8" stepped prima-ry tubes, and 3-1/2" x 9" collectors. Includes bolts and gaskets.
- Header Style:
- Circle Track 4-1 one-piece
- Header Material:
- Steel
- Header Finish:
- Temporary non-high temperature paint
- Weld-Up:
- No
- Primary Tube Outside Diameter (in.):
- 1.750, 1.875 in.
- Flange Style:
- 18 degree Chevy
- Flange Thickness (in.):
- 0.250 in.
- Collector Attachment:
- Slip fit
- Collector Diameter (in.):
- 3.500 in.
- Collector Reducers Included:
- No
- Collector Reducer Exit Diameter:
- N/A
- Tuned:
- No
- Primary Tube Length (in.):
- N/A
- Cylinder Head Port Shape:
- N/A
- Primary Tube Gauge:
- 18-gauge
- Gaskets Included:
- No
- Hardware Included:
- No
- Crossover Pipe Included:
- No
- Crossover Pipe Style:
- N/A
- Crossover Pipe Diameter:
- N/A
- Spark Plug Position:
- N/A
- Catalytic Converter(s) Included:
- No
- Oxygen Sensor Bung:
- No
- Quantity:
- Sold as a pair.
- Notes:
- Fits Rage and Harris (2016+) chassis models.
- Make:
- Chevrolet
- Engine Family:
- Chevy small block Gen I
- Engine Sizes:
- 4.3L/262-6.6L/400
- Years:
- 1955-2002
