Shop By Product Matching "FlowTech"
Choose a Model for your 1977 GMC
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- 1.5 in. Primary Tubing; 3 in. Collector Size; Mild Steel; Black Painted Finish; Gaskets; Hardware;Intended For Race Use Only May Require Clutch Linkage Modification~Does Not Fit w/Angle Plug Heads~Req. A/C Bracket PN[10042FLT]~w/Oxy. Sensor- Use Reducer PN[10105FLT] For 2.5 in Flange
- Long Tube Headers; 1.5 in. Primary Tubing; 3 in. Collector Size; Mild Steel; Black Painted Finish; Gaskets; Hardware;
- Long Tube Headers
- Product Attributes:
- Tube Diameter: 1.500 In.
- Primary Tube Diameter: 1.500 In.
- WARNING CA Proposition 65: Yes
- Application: Automotive
- Coated Finish: Painted
- Port Shape: Round
- Engine Make/Size: Chevy Small Block (262-400)
- Tube Direction: Down Swept
-
Features:
- Fuel Economy From The Engine
- Leak Test For Max Performance
- Mandrel-Formed Power Plenum
- Leak-proof O-Ringed Port Seals
- Include All Mounting Hardware
- Precision Engineered For Fit
- Flowtech headers are the perfect combination of performance and value. Flowtech long tube headers are precision engineered using mandrel bent tubing, formed collectors and 5/16 in. flanges with sealing rings for a leak-free seal. All mounting hardware and gaskets are included for a simple installation. This header is coated in a high heat resistant black paint for a stealthy appearance.
Additional Fitment Information:
| Vehicle | Block | CC | Engine | CID |
|---|---|---|---|---|
| 1977 - GMC Jimmy | V | - | 8 Cyl 5.0L | 305 |
- 1.5 in. Primary Tubing; 3 in. Collector Size; Mild Steel; Black Painted Finish; Gaskets; Hardware;Intended For Race Use Only May Require Clutch Linkage Modification~Does Not Fit w/Angle Plug Heads~Req. A/C Bracket PN[10042FLT]
- Long Tube Headers; 1.5 in. Primary Tubing; 3 in. Collector Size; Mild Steel; Black Painted Finish; Gaskets; Hardware;
- Long Tube Headers
- Product Attributes:
- Tube Diameter: 1.500 In.
- Primary Tube Diameter: 1.500 In.
- WARNING CA Proposition 65: Yes
- Application: Automotive
- Coated Finish: Painted
- Port Shape: Round
- Engine Make/Size: Chevy Small Block (262-400)
- Tube Direction: Down Swept
-
Features:
- Fuel Economy From The Engine
- Leak Test For Max Performance
- Mandrel-Formed Power Plenum
- Leak-proof O-Ringed Port Seals
- Include All Mounting Hardware
- Precision Engineered For Fit
- Flowtech headers are the perfect combination of performance and value. Flowtech long tube headers are precision engineered using mandrel bent tubing, formed collectors and 5/16 in. flanges with sealing rings for a leak-free seal. All mounting hardware and gaskets are included for a simple installation. This header is coated in a high heat resistant black paint for a stealthy appearance.
Additional Fitment Information:
| Vehicle | Block | CC | Engine | CID |
|---|---|---|---|---|
| 1977 - GMC C25 | V | - | 8 Cyl 5.0L | 305 |
- 1.5 in. Primary Tubing; w/3 in. Collector; Mild Steel; Ceramic Coated;Intended For Race Use Only May Require Clutch Linkage Modification~Does Not Fit w/Angle Plug Heads~Req. A/C Bracket PN[10042FLT]~Must Modify Stock Exhaust To Retain Cat. Converter
- Ceramic Header; 1.5 in. Primary Tubing; w/3 in. Collector; Mild Steel; Ceramic Coated;
- Ceramic Header
- Product Attributes:
- Tube Diameter: 1.500 In.
- Primary Tube Diameter: 1.500 In.
- WARNING CA Proposition 65: Yes
- Application: Automotive
- Coated Finish: Metallic Ceramic
- Port Shape: Round
- Engine Make/Size: Chevy Small Block (262-400)
- Tube Direction: Down Swept
-
Features:
- Fuel Economy From The Engine
- Leak Test For Max Performance
- Ceramic Headers
- Rust And Corrosion Resistance
- Mandrel-Formed Power Plenum
- Leak-proof O-Ringed Port Seals
- Include All Mounting Hardware
- Flowtech headers are the perfect combination of performance and value. Flowtech long tube headers are precision engineered using mandrel bent tubing, formed collectors and 5/16 in. flanges with sealing rings for a leak-free seal. All mounting hardware and gaskets are included for a simple installation. This header is coated in a high heat and corrosion resistant metallic ceramic thermal coating that increases exhaust velocity and reduces underhood temps for increased performance.
Additional Fitment Information:
| Vehicle | Block | CC | Engine | CID |
|---|---|---|---|---|
| 1977 - GMC K15 | V | - | 8 Cyl 6.6L | 400 |
- Includes 1 Pair Head Flange Gaskets/1 Pair 2.5 in. Exhaust Collector Gaskets/1 Pair 3 in. Exhaust Collector Gaskets; 1 Pair Full Length Header Gaskets
- Header Gasket Set; Includes 1 Pair Head Flange Gaskets/1 Pair 2.5 in. Exhaust Collector Gaskets/1 Pair 3 in. Exhaust Collector Gaskets; 1 Pair Full Length Header Gaskets;
- Header Gasket Set
- Product Attributes:
- Gasket Line: P73 Ferroglass Non-asbestos
- WARNING CA Proposition 65: No
- Collector Gaskets Included: Yes
- Port Size: 1.500 In. X 1.820 In.
-
Features:
- Engineered For A Precise Easy Fit
- P73 Ferro glass Non-Asbestos Facing Material
- Mechanically Clinched To A Perforated Metal Core
- Superior Sealing And Strength
- Inorganic Filler system
- Replacement Header Gaskets for 283-400 Small Block Chevy full length headers. Kit consists of (2) Header flange gaskets and (2) 3 in. collector gaskets and (2) 2.5 in. collector gaskets
Additional Fitment Information:
| Vehicle | Block | CC | Engine | CID |
|---|---|---|---|---|
| 1977 - GMC Jimmy | V | - | 8 Cyl 5.0L | 305 |
- 1.5 in. Primary Tubing; w/3 in. Collector; Mild Steel; Ceramic Coated;Intended For Race Use Only May Require Clutch Linkage Modification~Does Not Fit w/Angle Plug Heads~Req. A/C Bracket PN[10042FLT]~w/Oxy. Sensor - Use Reducer PN[10110FLT] For 3 in. Flange~Must Modify Stock Exhaust To Retain Cat. Converter
- Ceramic Header; 1.5 in. Primary Tubing; w/3 in. Collector; Mild Steel; Ceramic Coated;
- Ceramic Header
- Product Attributes:
- Tube Diameter: 1.500 In.
- Primary Tube Diameter: 1.500 In.
- WARNING CA Proposition 65: Yes
- Application: Automotive
- Coated Finish: Metallic Ceramic
- Port Shape: Round
- Engine Make/Size: Chevy Small Block (262-400)
- Tube Direction: Down Swept
-
Features:
- Fuel Economy From The Engine
- Leak Test For Max Performance
- Ceramic Headers
- Rust And Corrosion Resistance
- Mandrel-Formed Power Plenum
- Leak-proof O-Ringed Port Seals
- Include All Mounting Hardware
- Flowtech headers are the perfect combination of performance and value. Flowtech long tube headers are precision engineered using mandrel bent tubing, formed collectors and 5/16 in. flanges with sealing rings for a leak-free seal. All mounting hardware and gaskets are included for a simple installation. This header is coated in a high heat and corrosion resistant metallic ceramic thermal coating that increases exhaust velocity and reduces underhood temps for increased performance.
Additional Fitment Information:
| Vehicle | Block | CC | Engine | Sub Model | Drive Type | CID |
|---|---|---|---|---|---|---|
| 1977 - GMC Jimmy | V | - | 8 Cyl 5.0L | Base | RWD | 305 |
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