Tri-Y Headers for 68-91 GM Truck 396-502 BBC 1-3/4in Primary D303Y-B

Overview:68-91 GM Truck BBC Tri Y Black Ctd Doug's is the pioneering force behind the popular TRI-Y design for cars and trucks. The unique, shortend, paired primary tubes increase mid-range torque without sacrificing top end power. TRI-Y's are a great choice for daily drivers and heavy duty trucks looking to increase power from idle up to 4500 RPM while maintaining maximum fuel efficiency. Features: 3/8" thick machined flanges to prevent warping CNC mandrel bent tubes ensure accurate fit and better flow Heavy 16-guage tubing for longer life Tubes are pre-polished to removed scratches before applying metallic ceramic or hi-temp black coating Specs: Brand: Doug's Headers Collector Attachment: 3-Bolt Flange Collector Diameter: 2.5 IN Collector Port Diameter: 2.5 IN Color: Black Cylinder Head Port Shape: SAP Design: Full-length EGT Port: No Finish: Hi-Temp Black Coating Flange Thickness: 0.375 IN Gasket Or Seal Included: Yes Gaskets Included: Yes Grade Type: Performance Header Material: Steel Header Style: Full-length Material: Steel Mounting Hardware Included: Yes Oxygen Sensor Port: No Port Shape: Round Primary Tube Outside Diameter: 1.75 IN Primary Tubing Diameter: 1.75 IN Prop 65 (C, R or CR): CR Prop 65 Yes/No: Yes Sheen Level: Matte Title: Doug's Tri Y Header 68-91 GM Truck 396-502 BBC 1 3/4-2" Primary 2 1/2" Collector Black Hi Temp Coated D303Y-B Tube Wall Thickness: 16 GU Part Number: D303Y-B Applications: 1968-1969 Chevrolet C10 Pickup 396 CID 1970-1972 Chevrolet C10 Pickup 402 CID 1973-1974 Chevrolet C10 Pickup 454 CID 1968-1969 Chevrolet C20 Pickup 396 CID 1970-1972 Chevrolet C20 Pickup 402 CID 1973-1974 Chevrolet C20 Pickup 454 CID 1968-1969 Chevrolet C30 Pickup 396 CID 1970-1972 Chevrolet C30 Pickup 402 CID 1973-1974 Chevrolet C30 Pickup 454 CID 1968-1969 Chevrolet K10 Pickup 396 CID 1970-1972 Chevrolet K10 Pickup 402 CID 1973-1974 Chevrolet K10 Pickup 454 CID 1968-1969 Chevrolet K20 Pickup 396 CID 1970-1972 Chevrolet K20 Pickup 402 CID 1973-1974 Chevrolet K20 Pickup 454 CID 1968-1969 Chevrolet K30 Pickup 396 CID 1970-1972 Chevrolet K30 Pickup 402 CID 1973-1974 Chevrolet K30 Pickup 454 CID 1973-1974 Chevrolet Blazer 454 CID 1976-1978 Chevrolet K5 Blazer 454 CID 1975-1980 Chevrolet C10 454 CID 1968-1969 Chevrolet C10 Suburban 396 CID 1970-1972 Chevrolet C10 Suburban 402 CID 1973-1980 Chevrolet C10 Suburban 454 CID 1975-1987 Chevrolet C20 454 CID 1968-1969 Chevrolet C20 Suburban 396 CID 1970-1972 Chevrolet C20 Suburban 402 CID 1973-1986 Chevrolet C20 Suburban 454 CID 1975-1986 Chevrolet C30 454 CID 1988-1991 Chevrolet C3500 454 CID 1976-1980 Chevrolet K10 454 CID 1968-1969 Chevrolet K10 Suburban 396 CID 1970-1972 Chevrolet K10 Suburban 402 CID 1973-1974 Chevrolet K10 Suburban 454 CID 1976-1978 Chevrolet K20 454 CID 1968-1969 Chevrolet K20 Suburban 396 CID 1970-1972 Chevrolet K20 Suburban 402 CID 1973-1985 Chevrolet K20 Suburban 454 CID 1977-1986 Chevrolet K30 454 CID 1988-1991 Chevrolet K3500 454 CID 1987-1988 Chevrolet R20 454 CID 1987-1988 Chevrolet R20 Suburban 454 CID 1989-1989 Chevrolet R2500 454 CID 1989-1991 Chevrolet R2500 Suburban 454 CID 1987-1988 Chevrolet R30 454 CID 1989-1991 Chevrolet R3500 454 CID 1987-1988 Chevrolet V20 Suburban 454 CID 1990-1990 Chevrolet V2500 Suburban 454 CID 1987-1988 Chevrolet V30 454 CID 1989-1991 Chevrolet V3500 454 CID 1968-1969 GMC C15/C1500 Pickup 396 CID 1970-1972 GMC C15/C1500 Pickup 402 CID 1973-1974 GMC C15/C1500 Pickup 454 CID 1968-1969 GMC C15/C1500 Suburban 396 CID 1970-1972 GMC C15/C1500 Suburban 402 CID 1973-1974 GMC C15/C1500 Suburban 454 CID 1968-1969 GMC C25/C2500 Pickup 396 CID 1970-1972 GMC C25/C2500 Pickup 402 CID 1973-1974 GMC C25/C2500 Pickup 454 CID 1968-1969 GMC C25/C2500 Suburban 396 CID 1970-1972 GMC C25/C2500 Suburban 402 CID 1973-1974 GMC C25/C2500 Suburban 454 CID 1968-1969 GMC C35/C3500 Pickup 396 CID 1970-1972 GMC C35/C3500 Pickup 402 CID 1973-1974 GMC C35/C3500 Pickup 454 CID 1968-1969 GMC K15/K1500 Pickup 396 CID 1970-1972 GMC K15/K1500 Pickup 402 CID 1973-1974 GMC K15/K1500 Pickup 454 CID 1968-1969 GMC K15/K1500 Suburban 396 CID 1970-1972 GMC K15/K1500 Suburban 402 CID 1973-1974 GMC K15/K1500 Suburban 454 CID 1968-1969 GMC K25/K2500 Pickup 396 CID 1970-1972 GMC K25/K2500 Pickup 402 CID 1973-1974 GMC K25/K2500 Pickup 454 CID 1968-1969 GMC K25/K2500 Suburban 396 CID 1970-1972 GMC K25/K2500 Suburban 402 CID 1973-1974 GMC K25/K2500 Suburban 454 CID 1968-1969 GMC K35/K3500 Pickup 396 CID 1970-1972 GMC K35/K3500 Pickup 402 CID 1979-1980 GMC C1500 454 CID 1979-1980 GMC C1500 Suburban 454 CID 1979-1986 GMC C2500 454 CID 1979-1986 GMC C2500 Suburban 454 CID 1979-1986 GMC C3500 454 CID 1980-1980 GMC K1500 454 CID 1979-1986 GMC K3500 454 CID 1987-1989 GMC R2500 454 CID 1987-1991 GMC R2500 Suburban 454 CID 1987-1991 GMC R3500 454 CID 1987-1991 GMC V3500 454 CID 1975-1978 GMC C15 454 CID 1975-1978 GMC C15 Suburban 454 CID 1975-1978 GMC C25 454 CID 1975-1978 GMC C25 Suburban 454 CID 1975-1978 GMC C35 454 CID 1973-1976 GMC Jimmy 454 CID 1976-1976 GMC K15 454 CID 1976-1978 GMC K25 454 CID 1976-1977 GMC K25 Suburban 454 CID Emissions: This Product is LEGAL for Closed Course Competition use or Pre-Emissions Controlled Vehicles ONLY. It is Not Legal for use on any Emissions Controlled Vehicle for Street or Off Highway use. Instructions:Click here for installation instructions!Fitment Notes: Big block frame stands and motor mounts required for proper fit. with Air Conditioning Does not fit 4 speed applications with Factory Side bell housing mounts. without Catalytic Converter