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Doug Thorley Tri-Y Headers 375Y-C

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$633.97

Headers, Tri-Y, Steel, Silver Ceramic Coated, Chevy, GMC, Car, Truck, Small Block, Pair

  • The part DTE-375Y-C will have additional shipping charges due to its size. These charges will be shown in the shopping cart and checkout.

  • Order this item and get free delivery and handling on your entire order! Offer excludes truck freight fees. Valid on orders shipped in the contiguous United States.

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Manufacturer's Part Number: 375Y-C
Part Type: Headers
Summit Racing Part Number: DTE-375Y-C

Header Style: Tri-Y
Header Material: Steel
Header Finish: Silver ceramic coated
Weld-Up: No
Primary Tube Diameter (in): 1 5/8 in.
Collector Attachment: 3-bolt flange
Collector Diameter: 2.500 in.
Tuned: No
Primary Tube Gauge: 14-gauge
Flange Style: Standard
Flange Thickness (in): 3/8 in.
Bolts/Studs Included: Yes
Gaskets Included: Yes
Reducers Included: No
Cross Over Pipe Included: No
Catalytic Converter(s) Included: No
Motor Mounts Included: No
Transmission Mount Included: No
Quantity: Sold as a pair.
In-Store Pickup: Choose In-store pick-up (OH, GA, NV) on our web site.

Thorley headers are designed to outflow your stock exhaust manifolds. These headers increase gas mileage and give your engine more horsepower across the entire rpm range. The Tri-Y configuration builds the most power in the middle rpm range, which is great for towing and steep grades. To make these headers last, Thorley made them out of durable 14-gauge mild steel with 3/8 in. thick flanges and 5/16 in. collector rings. To prevent leaks, these headers have an O-ring welded into the flange, in addition to the high-temperature gasket provided. Unless otherwise noted, these headers are designed to fit the vehicle as it came from the manufacturer. This includes components like cylinder heads, chassis, steering, motor mounts, body mounts and bushings, etc. If your vehicle is using aftermarket components, parts from other applications, or custom altered parts, then it is the installer's responsibility to verify fitment.


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Make: CHEVROLET
Model: BEL AIR
Submodel: BASE
Beginning Year: 1965
Ending Year: 1967
Engine Type: V8
Liter: 4.6
CID: 283
CC: 4638
Engine Size: 4.6L/283
Engine Family: Chevy small block Gen I
Drivetrain: RWD
Engine Swap: No
Power Steering: No
Power Brakes (application): Yes
Air Conditioning: Yes
Standard Transmission Column Shift: Yes
Standard Transmission Floor Shift: Yes
Automatic Transmission Column Shift: Yes
Automatic Transmission Floor Shift: Yes
Footnotes: 2 - Will fit with angle plug heads.
6 - Does not fit Power Glide transmissions.
11 - Fits column shift models only.
Make: CHEVROLET
Model: BEL AIR
Submodel: BASE
Beginning Year: 1965
Ending Year: 1969
Engine Type: V8
Liter: 5.3
CID: 327
CC: 5358
Engine Size: 5.3L/327
Engine Family: Chevy small block Gen I
Drivetrain: RWD
Engine Swap: No
Power Steering: No
Power Brakes (application): Yes
Air Conditioning: Yes
Standard Transmission Column Shift: Yes
Standard Transmission Floor Shift: Yes
Automatic Transmission Column Shift: Yes
Automatic Transmission Floor Shift: Yes
Footnotes: 2 - Will fit with angle plug heads.
6 - Does not fit Power Glide transmissions.
11 - Fits column shift models only.
Make: CHEVROLET
Model: BEL AIR
Submodel: BASE
Beginning Year: 1968
Ending Year: 1968
Engine Type: V8
Liter: 5.0
CID: 307
CC: 5031
Engine Size: 5.0L/307
Engine Family: Chevy small block Gen I
Drivetrain: RWD
Engine Swap: No
Power Steering: No
Power Brakes (application): Yes
Air Conditioning: Yes
Standard Transmission Column Shift: Yes
Standard Transmission Floor Shift: Yes
Automatic Transmission Column Shift: Yes
Automatic Transmission Floor Shift: Yes
Footnotes: 2 - Will fit with angle plug heads.
6 - Does not fit Power Glide transmissions.
11 - Fits column shift models only.
Make: CHEVROLET
Model: BEL AIR
Submodel: BASE
Beginning Year: 1969
Ending Year: 1974
Engine Type: V8
Liter: 5.7
CID: 350
CC: 5736
Engine Size: 5.7L/350
Engine Family: Chevy small block Gen I
Drivetrain: RWD
Engine Swap: No
Power Steering: No
Power Brakes (application): Yes
Air Conditioning: Yes
Standard Transmission Column Shift: Yes
Standard Transmission Floor Shift: Yes
Automatic Transmission Column Shift: Yes
Automatic Transmission Floor Shift: Yes
Footnotes: 2 - Will fit with angle plug heads.
6 - Does not fit Power Glide transmissions.
11 - Fits column shift models only.
Make: CHEVROLET
Model: BEL AIR
Submodel: BASE
Beginning Year: 1970
Ending Year: 1974
Engine Type: V8
Liter: 6.6
CID: 400
CC: 6555
Engine Size: 6.6L/400
Engine Family: Chevy small block Gen I
Drivetrain: RWD
Engine Swap: No
Power Steering: No
Power Brakes (application): Yes
Air Conditioning: Yes
Standard Transmission Column Shift: Yes
Standard Transmission Floor Shift: Yes
Automatic Transmission Column Shift: Yes
Automatic Transmission Floor Shift: Yes
Footnotes: 2 - Will fit with angle plug heads.
6 - Does not fit Power Glide transmissions.
11 - Fits column shift models only.
Make: CHEVROLET
Model: BEL AIR
Submodel: BASE
Beginning Year: 1970
Ending Year: 1974
Engine Type: V8
Liter: 6.6
CID: 400
CC: 6556
Engine Size: 6.6L/400
Engine Family: Chevy small block Gen I
Drivetrain: RWD
Engine Swap: No
Power Steering: No
Power Brakes (application): Yes
Air Conditioning: Yes
Standard Transmission Column Shift: Yes
Standard Transmission Floor Shift: Yes
Automatic Transmission Column Shift: Yes
Automatic Transmission Floor Shift: Yes
Footnotes: 2 - Will fit with angle plug heads.
6 - Does not fit Power Glide transmissions.
11 - Fits column shift models only.
Make: CHEVROLET
Model: BEL AIR
Submodel: BASE
Beginning Year: 1972
Ending Year: 1974
Engine Type: V8
Liter: 5.7
CID: 350
CC: 5737
Engine Size: 5.7L/350
Engine Family: Chevy small block Gen I
Drivetrain: RWD
Engine Swap: No
Power Steering: No
Power Brakes (application): Yes
Air Conditioning: Yes
Standard Transmission Column Shift: Yes
Standard Transmission Floor Shift: Yes
Automatic Transmission Column Shift: Yes
Automatic Transmission Floor Shift: Yes
Footnotes: 2 - Will fit with angle plug heads.
6 - Does not fit Power Glide transmissions.
11 - Fits column shift models only.
Make: CHEVROLET
Model: BISCAYNE
Submodel: BASE
Beginning Year: 1965
Ending Year: 1967
Engine Type: V8
Liter: 4.6
CID: 283
CC: 4638
Engine Size: 4.6L/283
Engine Family: Chevy small block Gen I
Drivetrain: RWD
Engine Swap: No
Power Steering: No
Power Brakes (application): Yes
Air Conditioning: Yes
Standard Transmission Column Shift: Yes
Standard Transmission Floor Shift: Yes
Automatic Transmission Column Shift: Yes
Automatic Transmission Floor Shift: Yes
Footnotes: 2 - Will fit with angle plug heads.
6 - Does not fit Power Glide transmissions.
11 - Fits column shift models only.
Make: CHEVROLET
Model: BISCAYNE
Submodel: BASE
Beginning Year: 1965
Ending Year: 1969
Engine Type: V8
Liter: 5.3
CID: 327
CC: 5358
Engine Size: 5.3L/327
Engine Family: Chevy small block Gen I
Drivetrain: RWD
Engine Swap: No
Power Steering: No
Power Brakes (application): Yes
Air Conditioning: Yes
Standard Transmission Column Shift: Yes
Standard Transmission Floor Shift: Yes
Automatic Transmission Column Shift: Yes
Automatic Transmission Floor Shift: Yes
Footnotes: 2 - Will fit with angle plug heads.
6 - Does not fit Power Glide transmissions.
11 - Fits column shift models only.
Make: CHEVROLET
Model: BISCAYNE
Submodel: BASE
Beginning Year: 1968
Ending Year: 1968
Engine Type: V8
Liter: 5.0
CID: 307
CC: 5031
Engine Size: 5.0L/307
Engine Family: Chevy small block Gen I
Drivetrain: RWD
Engine Swap: No
Power Steering: No
Power Brakes (application): Yes
Air Conditioning: Yes
Standard Transmission Column Shift: Yes
Standard Transmission Floor Shift: Yes
Automatic Transmission Column Shift: Yes
Automatic Transmission Floor Shift: Yes
Footnotes: 2 - Will fit with angle plug heads.
6 - Does not fit Power Glide transmissions.
11 - Fits column shift models only.
Make: CHEVROLET
Model: BISCAYNE
Submodel: BASE
Beginning Year: 1969
Ending Year: 1972
Engine Type: V8
Liter: 5.7
CID: 350
CC: 5736
Engine Size: 5.7L/350
Engine Family: Chevy small block Gen I
Drivetrain: RWD
Engine Swap: No
Power Steering: No
Power Brakes (application): Yes
Air Conditioning: Yes
Standard Transmission Column Shift: Yes
Standard Transmission Floor Shift: Yes
Automatic Transmission Column Shift: Yes
Automatic Transmission Floor Shift: Yes
Footnotes: 2 - Will fit with angle plug heads.
6 - Does not fit Power Glide transmissions.
11 - Fits column shift models only.
Make: CHEVROLET
Model: BISCAYNE
Submodel: BASE
Beginning Year: 1970
Ending Year: 1972
Engine Type: V8
Liter: 6.6
CID: 400
CC: 6555
Engine Size: 6.6L/400
Engine Family: Chevy small block Gen I
Drivetrain: RWD
Engine Swap: No
Power Steering: No
Power Brakes (application): Yes
Air Conditioning: Yes
Standard Transmission Column Shift: Yes
Standard Transmission Floor Shift: Yes
Automatic Transmission Column Shift: Yes
Automatic Transmission Floor Shift: Yes
Footnotes: 2 - Will fit with angle plug heads.
6 - Does not fit Power Glide transmissions.
11 - Fits column shift models only.
Make: CHEVROLET
Model: BISCAYNE
Submodel: BASE
Beginning Year: 1970
Ending Year: 1972
Engine Type: V8
Liter: 6.6
CID: 400
CC: 6556
Engine Size: 6.6L/400
Engine Family: Chevy small block Gen I
Drivetrain: RWD
Engine Swap: No
Power Steering: No
Power Brakes (application): Yes
Air Conditioning: Yes
Standard Transmission Column Shift: Yes
Standard Transmission Floor Shift: Yes
Automatic Transmission Column Shift: Yes
Automatic Transmission Floor Shift: Yes
Footnotes: 2 - Will fit with angle plug heads.
6 - Does not fit Power Glide transmissions.
11 - Fits column shift models only.
Make: CHEVROLET
Model: BISCAYNE
Submodel: BASE
Beginning Year: 1972
Ending Year: 1972
Engine Type: V8
Liter: 5.7
CID: 350
CC: 5737
Engine Size: 5.7L/350
Engine Family: Chevy small block Gen I
Drivetrain: RWD
Engine Swap: No
Power Steering: No
Power Brakes (application): Yes
Air Conditioning: Yes
Standard Transmission Column Shift: Yes
Standard Transmission Floor Shift: Yes
Automatic Transmission Column Shift: Yes
Automatic Transmission Floor Shift: Yes
Footnotes: 2 - Will fit with angle plug heads.
6 - Does not fit Power Glide transmissions.
11 - Fits column shift models only.
Make: CHEVROLET
Model: BROOKWOOD
Submodel: BASE
Beginning Year: 1969
Ending Year: 1969
Engine Type: V8
Liter: 5.3
CID: 327
CC: 5358
Engine Size: 5.3L/327
Engine Family: Chevy small block Gen I
Drivetrain: RWD
Engine Swap: No
Power Steering: No
Power Brakes (application): Yes
Air Conditioning: Yes
Standard Transmission Column Shift: Yes
Standard Transmission Floor Shift: Yes
Automatic Transmission Column Shift: Yes
Automatic Transmission Floor Shift: Yes
Footnotes: 2 - Will fit with angle plug heads.
6 - Does not fit Power Glide transmissions.
11 - Fits column shift models only.
Make: CHEVROLET
Model: BROOKWOOD
Submodel: BASE
Beginning Year: 1969
Ending Year: 1972
Engine Type: V8
Liter: 5.0
CID: 307
CC: 5031
Engine Size: 5.0L/307
Engine Family: Chevy small block Gen I
Drivetrain: RWD
Engine Swap: No
Power Steering: No
Power Brakes (application): Yes
Air Conditioning: Yes
Standard Transmission Column Shift: Yes
Standard Transmission Floor Shift: Yes
Automatic Transmission Column Shift: Yes
Automatic Transmission Floor Shift: Yes
Footnotes: 2 - Will fit with angle plug heads.
6 - Does not fit Power Glide transmissions.
11 - Fits column shift models only.
Make: CHEVROLET
Model: BROOKWOOD
Submodel: BASE
Beginning Year: 1969
Ending Year: 1972
Engine Type: V8
Liter: 5.7
CID: 350
CC: 5736
Engine Size: 5.7L/350
Engine Family: Chevy small block Gen I
Drivetrain: RWD
Engine Swap: No
Power Steering: No
Power Brakes (application): Yes
Air Conditioning: Yes
Standard Transmission Column Shift: Yes
Standard Transmission Floor Shift: Yes
Automatic Transmission Column Shift: Yes
Automatic Transmission Floor Shift: Yes
Footnotes: 2 - Will fit with angle plug heads.
6 - Does not fit Power Glide transmissions.
11 - Fits column shift models only.
Make: CHEVROLET
Model: BROOKWOOD
Submodel: BASE
Beginning Year: 1970
Ending Year: 1970
Engine Type: V8
Liter: 6.6
CID: 400
CC: 6556
Engine Size: 6.6L/400
Engine Family: Chevy small block Gen I
Drivetrain: RWD
Engine Swap: No
Power Steering: No
Power Brakes (application): Yes
Air Conditioning: Yes
Standard Transmission Column Shift: Yes
Standard Transmission Floor Shift: Yes
Automatic Transmission Column Shift: Yes
Automatic Transmission Floor Shift: Yes
Footnotes: 2 - Will fit with angle plug heads.
6 - Does not fit Power Glide transmissions.
11 - Fits column shift models only.
Make: CHEVROLET
Model: BROOKWOOD
Submodel: BASE
Beginning Year: 1970
Ending Year: 1972
Engine Type: V8
Liter: 6.6
CID: 400
CC: 6555
Engine Size: 6.6L/400
Engine Family: Chevy small block Gen I
Drivetrain: RWD
Engine Swap: No
Power Steering: No
Power Brakes (application): Yes
Air Conditioning: Yes
Standard Transmission Column Shift: Yes
Standard Transmission Floor Shift: Yes
Automatic Transmission Column Shift: Yes
Automatic Transmission Floor Shift: Yes
Footnotes: 2 - Will fit with angle plug heads.
6 - Does not fit Power Glide transmissions.
11 - Fits column shift models only.
Make: CHEVROLET
Model: BROOKWOOD
Submodel: BASE
Beginning Year: 1972
Ending Year: 1972
Engine Type: V8
Liter: 5.7
CID: 350
CC: 5737
Engine Size: 5.7L/350
Engine Family: Chevy small block Gen I
Drivetrain: RWD
Engine Swap: No
Power Steering: No
Power Brakes (application): Yes
Air Conditioning: Yes
Standard Transmission Column Shift: Yes
Standard Transmission Floor Shift: Yes
Automatic Transmission Column Shift: Yes
Automatic Transmission Floor Shift: Yes
Footnotes: 2 - Will fit with angle plug heads.
6 - Does not fit Power Glide transmissions.
11 - Fits column shift models only.

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