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Product Summary

396, 402, 454, 283, 400, Tri-Y Header Tube Type, Raw

    Key Specs

    MFG. Part #D303Y-R
    BrandDougs Headers
    Header Tube TypeTri-Y
    FinishRaw
    Material TypeSteel

    Need To Know

    This Product Will Ship Free

    Shipping Policies & FAQs

    Quick and Easy Returns

    Return Policy

    Details

    Raw Header for Chevy/GMC 2WD & 4WD Trucks & SUV 1/2, 3/4, 1 Ton/ 1500, 2500, 3500 Trucks

    • Blazer/Jimmy, Suburban, Tahoe/Yukon (68-87) 396-502 Engine
    • 1 Ton/3500 Crew, Standard Cab Dually (73-91) 396-502 Engine
    • Class A (Chevy Chassis) (75-91) 396-502 Engine
    The Dougs Header you have chosen is raw, not Metallic Ceramic Thermal Barrier Coated (MCTBC) which is the standard finish on all Dougs Headers. The picture you see is the same header with MCTBC which protects and extends the life of headers by creating a thermal barrier that significantly lowers underhood temperatures and protects the substrate metal from thermal fatigue. It also provide corrosion resistance to protect it for years to come.

    Please see our online catalog for specific application information.

    Every Dougs header is tuned with the proper tube size and length to efficiently remove all the exhaust from each cylinder, reducing pumping losses resulting in a dramatic increases in horsepower and torque. Dougs headers are carefully developed on the vehicles they are intended to fit and are re-checked numerous times during the design and manufacturing process.Every Dougs header is tuned with the proper tube size and length to efficiently remove all the exhaust from each cylinder, reducing pumping losses resulting in a dramatic increases in horsepower and torque. Dougs headers are carefully developed on the vehicles they are intended to fit and are re-checked numerous times during the design and manufacturing process.

    • 3/8" Thick machined flanges...no warping
    • CNC mandrel bent tubes... accurate fit & better flow
    • Tri-Y headers yield maximum power from off idle to 4500 RPM making them well suited for applications demanding maximum mid-range torque with maximum fuel economy
    • Heavy 16 gauge tubing...longer life
    • Tubes are pre-polished to remove scratches and the header is left unfinished (raw steel) for individual customizing
    • Doug's Headers D303Y-R 1 3/4" Tri-Y Header Chevrolet Truck Big Block Chevrolet 68-87 Raw Steel
    • Tri-Y Design - Raw Steel
    • Collector: 2 1/2
    • Port Shape: SAP
    • Primary Tube: 1 3/4 - 2
    • legal for off-highway use (exc. in Calif. or states using Calif. emission standards)
    • Non catalytic converter equipped.
    • Non catalytic converter equipped
    • Not with bell housing mounts
    • Requires Big block frame stands and motor mounts
    • DUALLY
    • with A/C
    • without Catalytic Converter
    • with Column Shift
    • with Floor Shifter
    • Doug's Headers D303Y-R 1 3/4" Tri-Y Header Chevrolet Truck Big Block Chevrolet 68-87 Raw Steel
    • Tri-Y Design - Raw Steel
    • Collector: 2 1/2
    • Port Shape: SAP
    • Primary Tube: 1 3/4 - 2
    • legal for off-highway use (exc. in Calif. or states using Calif. emission standards)
    • Non catalytic converter equipped.
    • Non catalytic converter equipped
    • Not with bell housing mounts
    • Requires Big block frame stands and motor mounts
    • DUALLY
    • with A/C
    • without Catalytic Converter
    • with Column Shift
    • with Floor Shifter

    Application

    1968-1969 Chevrolet C10 Suburban 6.5L/396 V8
    1970-1972 Chevrolet C10 Suburban 6.6L/402 V8
    1975-1980 Chevrolet C10 Suburban 7.4L/454 V8
    1968-1969 Chevrolet C20 Suburban 6.5L/396 V8
    1976-1980 Chevrolet C20 Suburban 6.6L/400 V8
    1970-1972 Chevrolet C20 Suburban 6.6L/402 V8
    1975-1986 Chevrolet C20 Suburban 7.4L/454 V8
    1988-1991 Chevrolet C3500 7.4L/454 V8
    1968-1969 Chevrolet K10 Suburban 6.5L/396 V8
    1970-1972 Chevrolet K10 Suburban 6.6L/402 V8
    1988-1991 Chevrolet K3500 7.4L/454 V8
    1987 Chevrolet R20 Suburban 7.4L/454 V8
    1989-1991 Chevrolet R3500 7.4L/454 V8
    1989-1991 Chevrolet V3500 7.4L/454 V8
    1975-1978 GMC C15 Suburban 7.4L/454 V8
    1968-1969 GMC C15/C1500 Pickup 6.5L/396 V8
    1970-1972 GMC C15/C1500 Pickup 6.6L/402 V8
    1968-1969 GMC C15/C1500 Suburban 6.5L/396 V8
    1970-1971 GMC C15/C1500 Suburban 6.6L/402 V8
    1979-1980 GMC C1500 Suburban 7.4L/454 V8
    1979-1980 GMC C1500 6.6L/400 V8
    1979-1980 GMC C1500 7.4L/454 V8
    1978 GMC C25 Suburban 6.6L/400 V8
    1975-1978 GMC C25 Suburban 7.4L/454 V8
    1968-1969 GMC C25/C2500 Pickup 6.5L/396 V8
    1970-1972 GMC C25/C2500 Pickup 6.6L/402 V8
    1968-1969 GMC C25/C2500 Suburban 6.5L/396 V8
    1970-1972 GMC C25/C2500 Suburban 6.6L/402 V8
    1980 GMC C2500 Suburban 6.6L/400 V8
    1979-1986 GMC C2500 Suburban 7.4L/454 V8
    1979 GMC C2500 6.6L/400 V8
    1979-1986 GMC C2500 7.4L/454 V8
    1968-1969 GMC C35/C3500 Pickup 6.5L/396 V8
    1970-1972 GMC C35/C3500 Pickup 6.6L/402 V8
    1979 GMC C3500 6.6L/400 V8
    1979-1991 GMC C3500 7.4L/454 V8
    1975-1979 GMC Jimmy 6.6L/400 V8
    1976 GMC Jimmy 7.4L/454 V8
    1968-1969 GMC K15/K1500 Pickup 6.5L/396 V8
    1968 GMC K15/K1500 Suburban 6.5L/396 V8
    1970-1972 GMC K15/K1500 Suburban 6.6L/402 V8
    1974 GMC K15/K1500 Suburban 7.4L/454 V8
    1979-1980 GMC K1500 Suburban 6.6L/400 V8
    1979-1980 GMC K1500 6.6L/400 V8
    1979-1980 GMC K1500 7.4L/454 V8
    1968-1969 GMC K25/K2500 Pickup 6.5L/396 V8
    1968 GMC K25/K2500 Suburban 6.5L/396 V8
    1974 GMC K25/K2500 Suburban 7.4L/454 V8
    1979-1980 GMC K2500 Suburban 6.6L/400 V8
    1979-1980 GMC K2500 6.6L/400 V8
    1968-1969 GMC K35/K3500 Pickup 6.5L/396 V8
    1970-1971 GMC K35/K3500 Pickup 6.6L/402 V8
    1979-1980 GMC K3500 6.6L/400 V8
    1979-1991 GMC K3500 7.4L/454 V8
    1987 GMC R2500 Suburban 7.4L/454 V8
    1987 GMC R2500 7.4L/454 V8
    1987-1991 GMC R3500 7.4L/454 V8
    1987-1991 GMC V3500 7.4L/454 V8

    Guides & Documents

    CARB Warning

    For use on pre-1966 vehicles only

    Emissions warning: this part only legal for sale or use in California if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. ++any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering there are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

    Specifications

    KEY SPECS
    MFG. Part #D303Y-R
    BrandDougs Headers
    Header Tube TypeTri-Y
    FinishRaw
    Material TypeSteel
    GENERAL
    Flange StyleStandard
    Primary Tube Diameter1-3/4"
    ColorNatural
    Weld-UpNo
    Collector Diameter2-1/2 Inch
    Hardware IncludedYes
    Gasket(s) IncludedYes
    Sold in QuantityPair
    GTIN Code694342506995