{"product_id":"tri-y-headers-for-63-91-gm-truck-265-400-sbc-2-4-wd-1-5-8in-primary-d300y","title":"Tri-Y Headers for 63-91 GM Truck 265-400 SBC 2\/4 WD 1-5\/8in Primary D300Y","description":"\u003cp\u003e\u003cstrong\u003eOverview:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e63-91 GM Truck SBC Tri Y Silver Ctd \u003c\/p\u003e\u003cp\u003eDoug'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. \u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e3\/8\" thick machined flanges to prevent warping\u003c\/li\u003e\n\u003cli\u003eCNC mandrel bent tubes ensure accurate fit and better flow\u003c\/li\u003e\n\u003cli\u003eHeavy 16-guage tubing for longer life\u003c\/li\u003e\n\u003cli\u003eTubes are pre-polished to removed scratches before applying metallic ceramic or hi-temp black coating\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecs:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand: \u003c\/strong\u003eDoug's Headers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCollector Attachment: \u003c\/strong\u003e3-Bolt Flange\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCollector Diameter: \u003c\/strong\u003e2.5 IN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCollector Port Diameter: \u003c\/strong\u003e2.5 IN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder Head Port Shape: \u003c\/strong\u003eOval\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign: \u003c\/strong\u003eFull-length\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEGT Port: \u003c\/strong\u003eNo\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish: \u003c\/strong\u003eMetallic Ceramic Coated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlange Thickness: \u003c\/strong\u003e0.375 IN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGasket Or Seal Included: \u003c\/strong\u003eYes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGaskets Included: \u003c\/strong\u003eYes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrade Type: \u003c\/strong\u003ePerformance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeader Material: \u003c\/strong\u003eSteel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeader Style: \u003c\/strong\u003eFull-length\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial: \u003c\/strong\u003eSteel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Hardware Included: \u003c\/strong\u003eYes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOxygen Sensor Port: \u003c\/strong\u003eNo\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePort Shape: \u003c\/strong\u003eOval\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Tube Outside Diameter: \u003c\/strong\u003e1.625 IN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Tubing Diameter: \u003c\/strong\u003e1.625 IN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProp 65 (C, R or CR): \u003c\/strong\u003eCR\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProp 65 Yes\/No: \u003c\/strong\u003eYes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSheen Level: \u003c\/strong\u003eSemi-Gloss\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTitle: \u003c\/strong\u003eDoug's Tri Y Header 63-91 GM Truck 265-400  SBC 2 \u0026amp; 4 WD 1 5\/8-2\" Primary 2 1\/2\" Collector Silver Ceramic Coated D300Y\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTube Wall Thickness: \u003c\/strong\u003e16 GU\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number: \u003c\/strong\u003eD300Y\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e1963-1967 Chevrolet C10 Pickup 283 CID\u003c\/li\u003e\n\u003cli\u003e1966-1969 Chevrolet C10 Pickup 327 CID\u003c\/li\u003e\n\u003cli\u003e1968-1973 Chevrolet C10 Pickup 307 CID\u003c\/li\u003e\n\u003cli\u003e1969-1974 Chevrolet C10 Pickup 350 CID\u003c\/li\u003e\n\u003cli\u003e1963-1967 Chevrolet C20 Pickup 283 CID\u003c\/li\u003e\n\u003cli\u003e1966-1969 Chevrolet C20 Pickup 327 CID\u003c\/li\u003e\n\u003cli\u003e1968-1973 Chevrolet C20 Pickup 307 CID\u003c\/li\u003e\n\u003cli\u003e1969-1974 Chevrolet C20 Pickup 350 CID\u003c\/li\u003e\n\u003cli\u003e1963-1967 Chevrolet C30 Pickup 283 CID\u003c\/li\u003e\n\u003cli\u003e1966-1969 Chevrolet C30 Pickup 327 CID\u003c\/li\u003e\n\u003cli\u003e1968-1973 Chevrolet C30 Pickup 307 CID\u003c\/li\u003e\n\u003cli\u003e1969-1974 Chevrolet C30 Pickup 350 CID\u003c\/li\u003e\n\u003cli\u003e1963-1967 Chevrolet K10 Pickup 283 CID\u003c\/li\u003e\n\u003cli\u003e1966-1969 Chevrolet K10 Pickup 327 CID\u003c\/li\u003e\n\u003cli\u003e1969-1974 Chevrolet K10 Pickup 350 CID\u003c\/li\u003e\n\u003cli\u003e1963-1967 Chevrolet K20 Pickup 283 CID\u003c\/li\u003e\n\u003cli\u003e1966-1969 Chevrolet K20 Pickup 327 CID\u003c\/li\u003e\n\u003cli\u003e1968-1973 Chevrolet K20 Pickup 307 CID\u003c\/li\u003e\n\u003cli\u003e1969-1974 Chevrolet K20 Pickup 350 CID\u003c\/li\u003e\n\u003cli\u003e1968-1973 Chevrolet K30 Pickup 307 CID\u003c\/li\u003e\n\u003cli\u003e1968-1969 Chevrolet K30 Pickup 327 CID\u003c\/li\u003e\n\u003cli\u003e1969-1974 Chevrolet K30 Pickup 350 CID\u003c\/li\u003e\n\u003cli\u003e1963-1965 Chevrolet Suburban 283 CID\u003c\/li\u003e\n\u003cli\u003e1966-1966 Chevrolet Suburban 327 CID\u003c\/li\u003e\n\u003cli\u003e1969-1991 Chevrolet Blazer 350 CID\u003c\/li\u003e\n\u003cli\u003e1969-1973 Chevrolet Blazer 307 CID\u003c\/li\u003e\n\u003cli\u003e1987-1987 Chevrolet Blazer 305 CID\u003c\/li\u003e\n\u003cli\u003e1975-1986 Chevrolet K5 Blazer 350 CID\u003c\/li\u003e\n\u003cli\u003e1975-1979 Chevrolet K5 Blazer 400 CID\u003c\/li\u003e\n\u003cli\u003e1977-1986 Chevrolet K5 Blazer 305 CID\u003c\/li\u003e\n\u003cli\u003e1975-1986 Chevrolet C10 350 CID\u003c\/li\u003e\n\u003cli\u003e1976-1980 Chevrolet C10 400 CID\u003c\/li\u003e\n\u003cli\u003e1977-1986 Chevrolet C10 305 CID\u003c\/li\u003e\n\u003cli\u003e1967-1969 Chevrolet C10 Suburban 327 CID\u003c\/li\u003e\n\u003cli\u003e1967-1967 Chevrolet C10 Suburban 283 CID\u003c\/li\u003e\n\u003cli\u003e1968-1973 Chevrolet C10 Suburban 307 CID\u003c\/li\u003e\n\u003cli\u003e1969-1986 Chevrolet C10 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1977-1986 Chevrolet C10 Suburban 305 CID\u003c\/li\u003e\n\u003cli\u003e1975-1987 Chevrolet C20 350 CID\u003c\/li\u003e\n\u003cli\u003e1976-1980 Chevrolet C20 400 CID\u003c\/li\u003e\n\u003cli\u003e1977-1986 Chevrolet C20 305 CID\u003c\/li\u003e\n\u003cli\u003e1967-1969 Chevrolet C20 Suburban 327 CID\u003c\/li\u003e\n\u003cli\u003e1967-1967 Chevrolet C20 Suburban 283 CID\u003c\/li\u003e\n\u003cli\u003e1968-1973 Chevrolet C20 Suburban 307 CID\u003c\/li\u003e\n\u003cli\u003e1969-1986 Chevrolet C20 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1976-1980 Chevrolet C20 Suburban 400 CID\u003c\/li\u003e\n\u003cli\u003e1977-1986 Chevrolet C20 Suburban 305 CID\u003c\/li\u003e\n\u003cli\u003e1975-1986 Chevrolet C30 350 CID\u003c\/li\u003e\n\u003cli\u003e1976-1978 Chevrolet C30 400 CID\u003c\/li\u003e\n\u003cli\u003e1978-1978 Chevrolet C30 305 CID\u003c\/li\u003e\n\u003cli\u003e1975-1986 Chevrolet K10 350 CID\u003c\/li\u003e\n\u003cli\u003e1975-1980 Chevrolet K10 400 CID\u003c\/li\u003e\n\u003cli\u003e1977-1986 Chevrolet K10 305 CID\u003c\/li\u003e\n\u003cli\u003e1967-1969 Chevrolet K10 Suburban 327 CID\u003c\/li\u003e\n\u003cli\u003e1967-1967 Chevrolet K10 Suburban 283 CID\u003c\/li\u003e\n\u003cli\u003e1968-1973 Chevrolet K10 Suburban 307 CID\u003c\/li\u003e\n\u003cli\u003e1969-1986 Chevrolet K10 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1975-1979 Chevrolet K10 Suburban 400 CID\u003c\/li\u003e\n\u003cli\u003e1977-1986 Chevrolet K10 Suburban 305 CID\u003c\/li\u003e\n\u003cli\u003e1975-1986 Chevrolet K20 350 CID\u003c\/li\u003e\n\u003cli\u003e1975-1980 Chevrolet K20 400 CID\u003c\/li\u003e\n\u003cli\u003e1977-1985 Chevrolet K20 305 CID\u003c\/li\u003e\n\u003cli\u003e1967-1969 Chevrolet K20 Suburban 327 CID\u003c\/li\u003e\n\u003cli\u003e1967-1967 Chevrolet K20 Suburban 283 CID\u003c\/li\u003e\n\u003cli\u003e1968-1973 Chevrolet K20 Suburban 307 CID\u003c\/li\u003e\n\u003cli\u003e1969-1986 Chevrolet K20 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1975-1980 Chevrolet K20 Suburban 400 CID\u003c\/li\u003e\n\u003cli\u003e1977-1986 Chevrolet K20 Suburban 305 CID\u003c\/li\u003e\n\u003cli\u003e1977-1986 Chevrolet K30 350 CID\u003c\/li\u003e\n\u003cli\u003e1977-1980 Chevrolet K30 400 CID\u003c\/li\u003e\n\u003cli\u003e1987-1987 Chevrolet R10 350 CID\u003c\/li\u003e\n\u003cli\u003e1987-1987 Chevrolet R10 305 CID\u003c\/li\u003e\n\u003cli\u003e1987-1988 Chevrolet R10 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1987-1987 Chevrolet R10 Suburban 305 CID\u003c\/li\u003e\n\u003cli\u003e1989-1991 Chevrolet R1500 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1987-1988 Chevrolet R20 305 CID\u003c\/li\u003e\n\u003cli\u003e1987-1988 Chevrolet R20 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1989-1989 Chevrolet R2500 350 CID\u003c\/li\u003e\n\u003cli\u003e1989-1991 Chevrolet R2500 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1987-1988 Chevrolet R30 350 CID\u003c\/li\u003e\n\u003cli\u003e1989-1991 Chevrolet R3500 350 CID\u003c\/li\u003e\n\u003cli\u003e1987-1987 Chevrolet V10 350 CID\u003c\/li\u003e\n\u003cli\u003e1987-1987 Chevrolet V10 305 CID\u003c\/li\u003e\n\u003cli\u003e1987-1988 Chevrolet V10 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1989-1991 Chevrolet V1500 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1987-1987 Chevrolet V20 350 CID\u003c\/li\u003e\n\u003cli\u003e1987-1988 Chevrolet V20 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1989-1991 Chevrolet V2500 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1987-1988 Chevrolet V30 350 CID\u003c\/li\u003e\n\u003cli\u003e1989-1991 Chevrolet V3500 350 CID\u003c\/li\u003e\n\u003cli\u003e1963-1963 GMC 1000 Series 283 CID\u003c\/li\u003e\n\u003cli\u003e1963-1963 GMC 2500 Series 283 CID\u003c\/li\u003e\n\u003cli\u003e1967-1968 GMC C15\/C1500 Pickup 327 CID\u003c\/li\u003e\n\u003cli\u003e1967-1967 GMC C15\/C1500 Pickup 283 CID\u003c\/li\u003e\n\u003cli\u003e1969-1974 GMC C15\/C1500 Pickup 350 CID\u003c\/li\u003e\n\u003cli\u003e1967-1968 GMC C15\/C1500 Suburban 327 CID\u003c\/li\u003e\n\u003cli\u003e1967-1967 GMC C15\/C1500 Suburban 283 CID\u003c\/li\u003e\n\u003cli\u003e1968-1973 GMC C15\/C1500 Suburban 307 CID\u003c\/li\u003e\n\u003cli\u003e1969-1974 GMC C15\/C1500 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1967-1968 GMC C25\/C2500 Pickup 327 CID\u003c\/li\u003e\n\u003cli\u003e1967-1967 GMC C25\/C2500 Pickup 283 CID\u003c\/li\u003e\n\u003cli\u003e1968-1973 GMC C25\/C2500 Pickup 307 CID\u003c\/li\u003e\n\u003cli\u003e1969-1974 GMC C25\/C2500 Pickup 350 CID\u003c\/li\u003e\n\u003cli\u003e1967-1973 GMC C25\/C2500 Suburban 327 CID\u003c\/li\u003e\n\u003cli\u003e1969-1974 GMC C25\/C2500 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1967-1968 GMC C35\/C3500 Pickup 327 CID\u003c\/li\u003e\n\u003cli\u003e1967-1967 GMC C35\/C3500 Pickup 283 CID\u003c\/li\u003e\n\u003cli\u003e1968-1973 GMC C35\/C3500 Pickup 307 CID\u003c\/li\u003e\n\u003cli\u003e1969-1974 GMC C35\/C3500 Pickup 350 CID\u003c\/li\u003e\n\u003cli\u003e1967-1968 GMC K15\/K1500 Pickup 327 CID\u003c\/li\u003e\n\u003cli\u003e1967-1967 GMC K15\/K1500 Pickup 283 CID\u003c\/li\u003e\n\u003cli\u003e1968-1973 GMC K15\/K1500 Pickup 307 CID\u003c\/li\u003e\n\u003cli\u003e1969-1974 GMC K15\/K1500 Pickup 350 CID\u003c\/li\u003e\n\u003cli\u003e1967-1968 GMC K15\/K1500 Suburban 327 CID\u003c\/li\u003e\n\u003cli\u003e1967-1967 GMC K15\/K1500 Suburban 283 CID\u003c\/li\u003e\n\u003cli\u003e1968-1973 GMC K15\/K1500 Suburban 307 CID\u003c\/li\u003e\n\u003cli\u003e1969-1974 GMC K15\/K1500 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1967-1968 GMC K25\/K2500 Pickup 327 CID\u003c\/li\u003e\n\u003cli\u003e1968-1973 GMC K25\/K2500 Pickup 307 CID\u003c\/li\u003e\n\u003cli\u003e1969-1974 GMC K25\/K2500 Pickup 350 CID\u003c\/li\u003e\n\u003cli\u003e1967-1968 GMC K25\/K2500 Suburban 327 CID\u003c\/li\u003e\n\u003cli\u003e1967-1967 GMC K25\/K2500 Suburban 283 CID\u003c\/li\u003e\n\u003cli\u003e1968-1973 GMC K25\/K2500 Suburban 307 CID\u003c\/li\u003e\n\u003cli\u003e1969-1974 GMC K25\/K2500 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1968-1973 GMC K35\/K3500 Pickup 307 CID\u003c\/li\u003e\n\u003cli\u003e1968-1968 GMC K35\/K3500 Pickup 327 CID\u003c\/li\u003e\n\u003cli\u003e1969-1974 GMC K35\/K3500 Pickup 350 CID\u003c\/li\u003e\n\u003cli\u003e1979-1986 GMC C1500 350 CID\u003c\/li\u003e\n\u003cli\u003e1979-1986 GMC C1500 305 CID\u003c\/li\u003e\n\u003cli\u003e1979-1980 GMC C1500 400 CID\u003c\/li\u003e\n\u003cli\u003e1979-1986 GMC C1500 Suburban 305 CID\u003c\/li\u003e\n\u003cli\u003e1979-1986 GMC C1500 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1979-1986 GMC C2500 350 CID\u003c\/li\u003e\n\u003cli\u003e1979-1979 GMC C2500 400 CID\u003c\/li\u003e\n\u003cli\u003e1980-1986 GMC C2500 305 CID\u003c\/li\u003e\n\u003cli\u003e1979-1986 GMC C2500 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1980-1980 GMC C2500 Suburban 400 CID\u003c\/li\u003e\n\u003cli\u003e1982-1986 GMC C2500 Suburban 305 CID\u003c\/li\u003e\n\u003cli\u003e1979-1986 GMC C3500 350 CID\u003c\/li\u003e\n\u003cli\u003e1979-1979 GMC C3500 400 CID\u003c\/li\u003e\n\u003cli\u003e1986-1986 GMC C3500 305 CID\u003c\/li\u003e\n\u003cli\u003e1979-1986 GMC K1500 350 CID\u003c\/li\u003e\n\u003cli\u003e1979-1980 GMC K1500 400 CID\u003c\/li\u003e\n\u003cli\u003e1981-1986 GMC K1500 305 CID\u003c\/li\u003e\n\u003cli\u003e1979-1986 GMC K1500 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1979-1980 GMC K1500 Suburban 400 CID\u003c\/li\u003e\n\u003cli\u003e1982-1982 GMC K1500 Suburban 305 CID\u003c\/li\u003e\n\u003cli\u003e1979-1986 GMC K2500 350 CID\u003c\/li\u003e\n\u003cli\u003e1979-1980 GMC K2500 400 CID\u003c\/li\u003e\n\u003cli\u003e1979-1986 GMC K2500 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1979-1980 GMC K2500 Suburban 400 CID\u003c\/li\u003e\n\u003cli\u003e1979-1986 GMC K3500 350 CID\u003c\/li\u003e\n\u003cli\u003e1979-1980 GMC K3500 400 CID\u003c\/li\u003e\n\u003cli\u003e1987-1991 GMC R1500 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1987-1989 GMC R2500 350 CID\u003c\/li\u003e\n\u003cli\u003e1987-1987 GMC R2500 305 CID\u003c\/li\u003e\n\u003cli\u003e1987-1991 GMC R2500 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1987-1991 GMC R3500 350 CID\u003c\/li\u003e\n\u003cli\u003e1976-1978 GMC C15 400 CID\u003c\/li\u003e\n\u003cli\u003e1977-1978 GMC C15 305 CID\u003c\/li\u003e\n\u003cli\u003e1975-1978 GMC C15 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1977-1978 GMC C15 Suburban 305 CID\u003c\/li\u003e\n\u003cli\u003e1975-1978 GMC C25 350 CID\u003c\/li\u003e\n\u003cli\u003e1976-1978 GMC C25 400 CID\u003c\/li\u003e\n\u003cli\u003e1975-1978 GMC C25 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1977-1978 GMC C25 Suburban 305 CID\u003c\/li\u003e\n\u003cli\u003e1978-1978 GMC C25 Suburban 400 CID\u003c\/li\u003e\n\u003cli\u003e1975-1978 GMC C35 350 CID\u003c\/li\u003e\n\u003cli\u003e1976-1978 GMC C35 400 CID\u003c\/li\u003e\n\u003cli\u003e1978-1978 GMC C35 305 CID\u003c\/li\u003e\n\u003cli\u003e1970-1991 GMC Jimmy 350 CID\u003c\/li\u003e\n\u003cli\u003e1970-1973 GMC Jimmy 307 CID\u003c\/li\u003e\n\u003cli\u003e1975-1979 GMC Jimmy 400 CID\u003c\/li\u003e\n\u003cli\u003e1977-1987 GMC Jimmy 305 CID\u003c\/li\u003e\n\u003cli\u003e1975-1978 GMC K15 400 CID\u003c\/li\u003e\n\u003cli\u003e1977-1978 GMC K15 305 CID\u003c\/li\u003e\n\u003cli\u003e1975-1978 GMC K15 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1975-1978 GMC K15 Suburban 400 CID\u003c\/li\u003e\n\u003cli\u003e1975-1978 GMC K25 350 CID\u003c\/li\u003e\n\u003cli\u003e1975-1978 GMC K25 400 CID\u003c\/li\u003e\n\u003cli\u003e1977-1978 GMC K25 305 CID\u003c\/li\u003e\n\u003cli\u003e1975-1978 GMC K25 Suburban 350 CID\u003c\/li\u003e\n\u003cli\u003e1975-1978 GMC K25 Suburban 400 CID\u003c\/li\u003e\n\u003cli\u003e1977-1978 GMC K25 Suburban 305 CID\u003c\/li\u003e\n\u003cli\u003e1977-1978 GMC K35 400 CID\u003c\/li\u003e\n\u003cli\u003e1977-1978 GMC K35 350 CID\u003c\/li\u003e\n\u003cli\u003e1987-1987 GMC R1500 350 CID\u003c\/li\u003e\n\u003cli\u003e1987-1987 GMC R1500 305 CID\u003c\/li\u003e\n\u003cli\u003e1987-1987 GMC V1500 305 CID\u003c\/li\u003e\n\u003cli\u003e1987-1987 GMC V1500 350 CID\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eEmissions:\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003eThis 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.\u003c\/li\u003e \u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eInstructions:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003e\u003ca href=\"https:\/\/prod-da.s3.us-east-2.amazonaws.com\/BHKJ\/93bdc1d1ebbd65c10c5e082b1c2c27ad.pdf\" target=\"_blank\"\u003eClick here for installation instructions!\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eFitment Notes: \u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFits most angle plug heads.\u003c\/li\u003e\n\u003cli\u003eFits D-Port cylinder heads including ZZ4 crate engines. Will Not fit GM Fast Burn head PN 19300955 or SP350, SP383 and ZZ6 engines.\u003c\/li\u003e\n\u003cli\u003eInstallation requires left side A\/C bracket part number H7608.\u003c\/li\u003e\n\u003cli\u003eTri Y design. This long tube header has excellent ground clearance with collector above the bottom of the frame rails.\u003c\/li\u003e\n\u003cli\u003e63-67 C10\/C20\/1000\/2000\/C15\/C1500\/C25\/C2500 4.6L Works with Coil Spring front suspension Only, NOT Torsion Bar.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Doug's Headers","offers":[{"title":"Default Title","offer_id":54508672581845,"sku":"D300Y-BKLK","price":1004.2,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2493\/0960\/files\/169629e166a648dd85717bb80a9fa7ef.jpg?v=1786703950","url":"https:\/\/moderndaymuffler.com\/products\/tri-y-headers-for-63-91-gm-truck-265-400-sbc-2-4-wd-1-5-8in-primary-d300y","provider":"Modern Day Muffler","version":"1.0","type":"link"}