Details
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. Their design configuration builds the most power across the rpm range, which is great for everything from street/strip performance, to towing, to 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 and topped them off with a good looking, nickel chrome plated finish. 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.
Header Style: Full-length
Header Material: Steel
Header Finish: Silver ceramic coated
Primary Tube Diameter (in): 1 3/4 in.
Collector Attachment: 3-bolt flange
Collector Diameter: 3.000 in.
Tuned: No
Primary Tube Gauge: 14-gauge
Cylinder Head Port Shape: D-port
Flange Style: Standard
Flange Thickness (in): 3/8 in.
Bolts/Studs Included: Yes
Gaskets Included: Yes
Reducers Included: No
Y-Pipe Included: No
Motor Mounts Included: No
Transmission Mount Included: No
Quantity: Sold as a pair.
Drivetrain RWD
Power Steering Yes
Power Brakes Yes
Air Conditioning Yes
Standard Transmission Column Shift No
Standard Transmission Floor Shift Yes
Automatic Transmission Column Shift No
Automatic Transmission Floor Shift Yes
Application Footnotes: 49 - This header is designed to fit standard "D-port" heads only. Will not fit 455 HO, SD, or Edelbrock heads.
Vehicle Type Group Automotive
Additional Information
| year make model | 1964-1973 Pontiac GTO and LeMans 1967-1974 Pontiac Firebird and Trans Am 1970-1974 Pontiac Grand Prix thy341c |
|---|---|
| Manufacturer | DOUG THORLEY HEADERS |
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