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Doug Thorley Tri-Y Headers 354Y

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Headers, Tri-Y, Steel, Chrome, Chevy 1970-90, Class A Motor Home, 396/454, Pair

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Brand: Doug Thorley Headers

Manufacturer's Part Number: 354Y

Part Type: Headers

Product Line: Doug Thorley Tri-Y Headers

Summit Racing Part Number: DTE-354Y

Header Style: Tri-Y

Header Material: Steel

Header Finish: Chrome

Weld-Up: No

Primary Tube Diameter (in): 1 3/4 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

Crossover Pipe Included: No

Catalytic Converter(s) Included: No

Motor Mounts Included: No

Transmission Mount Included: No

Quantity: Sold as a pair.

CARB EO Number: D-540-5 (pdf)
To see a list of qualifying vehicles, enter CARB EO Number D-540-5

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.

Warranty

Some parts are not legal for sale or use in California on any pollution-controlled motor vehicles

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