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. 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.
Header Style: Tri-Y
Header Material: Steel
Header Finish: Ceramic coated
Primary Tube Diameter (in): 1 5/8 in.
Collector Attachment: Stock 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
Y-Pipe Included: No
Motor Mounts Included: No
Transmission Mount Included: No
Quantity: Sold as a pair.
Notes: Has provisions for heat riser, with 3 in. catalytic converter inlet and smog hookups.
Drivetrain 4WD
Power Steering Yes
Power Brakes Yes
Air Conditioning Yes
Standard Transmission Column Shift No
Standard Transmission Floor Shift No
Automatic Transmission Column Shift Yes
Automatic Transmission Floor Shift Yes
Application Footnotes:
2 - Will fit with angle plug heads.
13 - Does not fit 5-speed models with hydraulic clutch.
17 - For legality under CARB regulations, the included connector pipe must be used on vehicle originally equipped with a catalytic converter.
22 - Will not fit column shift.
28 - Fits Oldsmobile 403-455 engines only.
Additional Information
| year make model | 1973-1991 Chevy Blazer 1973-1991 GMC Jimmy thy364y6sc |
|---|---|
| Manufacturer | DOUG THORLEY HEADERS |
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