{"product_id":"tri-y-headers-for-68-91-gm-truck-396-502-bbc-1-3-4in-primary-d303y-b","title":"Tri-Y Headers for 68-91 GM Truck 396-502 BBC 1-3\/4in Primary D303Y-B","description":"\u003cp\u003e\u003cstrong\u003eOverview:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e68-91 GM Truck BBC Tri Y Black 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\u003eColor: \u003c\/strong\u003eBlack\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder Head Port Shape: \u003c\/strong\u003eSAP\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\u003eHi-Temp Black Coating\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\u003eRound\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Tube Outside Diameter: \u003c\/strong\u003e1.75 IN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Tubing Diameter: \u003c\/strong\u003e1.75 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\u003eMatte\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTitle: \u003c\/strong\u003eDoug'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\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\u003eD303Y-B\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e1968-1969 Chevrolet C10 Pickup 396 CID\u003c\/li\u003e\n\u003cli\u003e1970-1972 Chevrolet C10 Pickup 402 CID\u003c\/li\u003e\n\u003cli\u003e1973-1974 Chevrolet C10 Pickup 454 CID\u003c\/li\u003e\n\u003cli\u003e1968-1969 Chevrolet C20 Pickup 396 CID\u003c\/li\u003e\n\u003cli\u003e1970-1972 Chevrolet C20 Pickup 402 CID\u003c\/li\u003e\n\u003cli\u003e1973-1974 Chevrolet C20 Pickup 454 CID\u003c\/li\u003e\n\u003cli\u003e1968-1969 Chevrolet C30 Pickup 396 CID\u003c\/li\u003e\n\u003cli\u003e1970-1972 Chevrolet C30 Pickup 402 CID\u003c\/li\u003e\n\u003cli\u003e1973-1974 Chevrolet C30 Pickup 454 CID\u003c\/li\u003e\n\u003cli\u003e1968-1969 Chevrolet K10 Pickup 396 CID\u003c\/li\u003e\n\u003cli\u003e1970-1972 Chevrolet K10 Pickup 402 CID\u003c\/li\u003e\n\u003cli\u003e1973-1974 Chevrolet K10 Pickup 454 CID\u003c\/li\u003e\n\u003cli\u003e1968-1969 Chevrolet K20 Pickup 396 CID\u003c\/li\u003e\n\u003cli\u003e1970-1972 Chevrolet K20 Pickup 402 CID\u003c\/li\u003e\n\u003cli\u003e1973-1974 Chevrolet K20 Pickup 454 CID\u003c\/li\u003e\n\u003cli\u003e1968-1969 Chevrolet K30 Pickup 396 CID\u003c\/li\u003e\n\u003cli\u003e1970-1972 Chevrolet K30 Pickup 402 CID\u003c\/li\u003e\n\u003cli\u003e1973-1974 Chevrolet K30 Pickup 454 CID\u003c\/li\u003e\n\u003cli\u003e1973-1974 Chevrolet Blazer 454 CID\u003c\/li\u003e\n\u003cli\u003e1976-1978 Chevrolet K5 Blazer 454 CID\u003c\/li\u003e\n\u003cli\u003e1975-1980 Chevrolet C10 454 CID\u003c\/li\u003e\n\u003cli\u003e1968-1969 Chevrolet C10 Suburban 396 CID\u003c\/li\u003e\n\u003cli\u003e1970-1972 Chevrolet C10 Suburban 402 CID\u003c\/li\u003e\n\u003cli\u003e1973-1980 Chevrolet C10 Suburban 454 CID\u003c\/li\u003e\n\u003cli\u003e1975-1987 Chevrolet C20 454 CID\u003c\/li\u003e\n\u003cli\u003e1968-1969 Chevrolet C20 Suburban 396 CID\u003c\/li\u003e\n\u003cli\u003e1970-1972 Chevrolet C20 Suburban 402 CID\u003c\/li\u003e\n\u003cli\u003e1973-1986 Chevrolet C20 Suburban 454 CID\u003c\/li\u003e\n\u003cli\u003e1975-1986 Chevrolet C30 454 CID\u003c\/li\u003e\n\u003cli\u003e1988-1991 Chevrolet C3500 454 CID\u003c\/li\u003e\n\u003cli\u003e1976-1980 Chevrolet K10 454 CID\u003c\/li\u003e\n\u003cli\u003e1968-1969 Chevrolet K10 Suburban 396 CID\u003c\/li\u003e\n\u003cli\u003e1970-1972 Chevrolet K10 Suburban 402 CID\u003c\/li\u003e\n\u003cli\u003e1973-1974 Chevrolet K10 Suburban 454 CID\u003c\/li\u003e\n\u003cli\u003e1976-1978 Chevrolet K20 454 CID\u003c\/li\u003e\n\u003cli\u003e1968-1969 Chevrolet K20 Suburban 396 CID\u003c\/li\u003e\n\u003cli\u003e1970-1972 Chevrolet K20 Suburban 402 CID\u003c\/li\u003e\n\u003cli\u003e1973-1985 Chevrolet K20 Suburban 454 CID\u003c\/li\u003e\n\u003cli\u003e1977-1986 Chevrolet K30 454 CID\u003c\/li\u003e\n\u003cli\u003e1988-1991 Chevrolet K3500 454 CID\u003c\/li\u003e\n\u003cli\u003e1987-1988 Chevrolet R20 454 CID\u003c\/li\u003e\n\u003cli\u003e1987-1988 Chevrolet R20 Suburban 454 CID\u003c\/li\u003e\n\u003cli\u003e1989-1989 Chevrolet R2500 454 CID\u003c\/li\u003e\n\u003cli\u003e1989-1991 Chevrolet R2500 Suburban 454 CID\u003c\/li\u003e\n\u003cli\u003e1987-1988 Chevrolet R30 454 CID\u003c\/li\u003e\n\u003cli\u003e1989-1991 Chevrolet R3500 454 CID\u003c\/li\u003e\n\u003cli\u003e1987-1988 Chevrolet V20 Suburban 454 CID\u003c\/li\u003e\n\u003cli\u003e1990-1990 Chevrolet V2500 Suburban 454 CID\u003c\/li\u003e\n\u003cli\u003e1987-1988 Chevrolet V30 454 CID\u003c\/li\u003e\n\u003cli\u003e1989-1991 Chevrolet V3500 454 CID\u003c\/li\u003e\n\u003cli\u003e1968-1969 GMC C15\/C1500 Pickup 396 CID\u003c\/li\u003e\n\u003cli\u003e1970-1972 GMC C15\/C1500 Pickup 402 CID\u003c\/li\u003e\n\u003cli\u003e1973-1974 GMC C15\/C1500 Pickup 454 CID\u003c\/li\u003e\n\u003cli\u003e1968-1969 GMC C15\/C1500 Suburban 396 CID\u003c\/li\u003e\n\u003cli\u003e1970-1972 GMC C15\/C1500 Suburban 402 CID\u003c\/li\u003e\n\u003cli\u003e1973-1974 GMC C15\/C1500 Suburban 454 CID\u003c\/li\u003e\n\u003cli\u003e1968-1969 GMC C25\/C2500 Pickup 396 CID\u003c\/li\u003e\n\u003cli\u003e1970-1972 GMC C25\/C2500 Pickup 402 CID\u003c\/li\u003e\n\u003cli\u003e1973-1974 GMC C25\/C2500 Pickup 454 CID\u003c\/li\u003e\n\u003cli\u003e1968-1969 GMC C25\/C2500 Suburban 396 CID\u003c\/li\u003e\n\u003cli\u003e1970-1972 GMC C25\/C2500 Suburban 402 CID\u003c\/li\u003e\n\u003cli\u003e1973-1974 GMC C25\/C2500 Suburban 454 CID\u003c\/li\u003e\n\u003cli\u003e1968-1969 GMC C35\/C3500 Pickup 396 CID\u003c\/li\u003e\n\u003cli\u003e1970-1972 GMC C35\/C3500 Pickup 402 CID\u003c\/li\u003e\n\u003cli\u003e1973-1974 GMC C35\/C3500 Pickup 454 CID\u003c\/li\u003e\n\u003cli\u003e1968-1969 GMC K15\/K1500 Pickup 396 CID\u003c\/li\u003e\n\u003cli\u003e1970-1972 GMC K15\/K1500 Pickup 402 CID\u003c\/li\u003e\n\u003cli\u003e1973-1974 GMC K15\/K1500 Pickup 454 CID\u003c\/li\u003e\n\u003cli\u003e1968-1969 GMC K15\/K1500 Suburban 396 CID\u003c\/li\u003e\n\u003cli\u003e1970-1972 GMC K15\/K1500 Suburban 402 CID\u003c\/li\u003e\n\u003cli\u003e1973-1974 GMC K15\/K1500 Suburban 454 CID\u003c\/li\u003e\n\u003cli\u003e1968-1969 GMC K25\/K2500 Pickup 396 CID\u003c\/li\u003e\n\u003cli\u003e1970-1972 GMC K25\/K2500 Pickup 402 CID\u003c\/li\u003e\n\u003cli\u003e1973-1974 GMC K25\/K2500 Pickup 454 CID\u003c\/li\u003e\n\u003cli\u003e1968-1969 GMC K25\/K2500 Suburban 396 CID\u003c\/li\u003e\n\u003cli\u003e1970-1972 GMC K25\/K2500 Suburban 402 CID\u003c\/li\u003e\n\u003cli\u003e1973-1974 GMC K25\/K2500 Suburban 454 CID\u003c\/li\u003e\n\u003cli\u003e1968-1969 GMC K35\/K3500 Pickup 396 CID\u003c\/li\u003e\n\u003cli\u003e1970-1972 GMC K35\/K3500 Pickup 402 CID\u003c\/li\u003e\n\u003cli\u003e1979-1980 GMC C1500 454 CID\u003c\/li\u003e\n\u003cli\u003e1979-1980 GMC C1500 Suburban 454 CID\u003c\/li\u003e\n\u003cli\u003e1979-1986 GMC C2500 454 CID\u003c\/li\u003e\n\u003cli\u003e1979-1986 GMC C2500 Suburban 454 CID\u003c\/li\u003e\n\u003cli\u003e1979-1986 GMC C3500 454 CID\u003c\/li\u003e\n\u003cli\u003e1980-1980 GMC K1500 454 CID\u003c\/li\u003e\n\u003cli\u003e1979-1986 GMC K3500 454 CID\u003c\/li\u003e\n\u003cli\u003e1987-1989 GMC R2500 454 CID\u003c\/li\u003e\n\u003cli\u003e1987-1991 GMC R2500 Suburban 454 CID\u003c\/li\u003e\n\u003cli\u003e1987-1991 GMC R3500 454 CID\u003c\/li\u003e\n\u003cli\u003e1987-1991 GMC V3500 454 CID\u003c\/li\u003e\n\u003cli\u003e1975-1978 GMC C15 454 CID\u003c\/li\u003e\n\u003cli\u003e1975-1978 GMC C15 Suburban 454 CID\u003c\/li\u003e\n\u003cli\u003e1975-1978 GMC C25 454 CID\u003c\/li\u003e\n\u003cli\u003e1975-1978 GMC C25 Suburban 454 CID\u003c\/li\u003e\n\u003cli\u003e1975-1978 GMC C35 454 CID\u003c\/li\u003e\n\u003cli\u003e1973-1976 GMC Jimmy 454 CID\u003c\/li\u003e\n\u003cli\u003e1976-1976 GMC K15 454 CID\u003c\/li\u003e\n\u003cli\u003e1976-1978 GMC K25 454 CID\u003c\/li\u003e\n\u003cli\u003e1976-1977 GMC K25 Suburban 454 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\/e29ca3658dcd200b71570fc29e400e8a.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\u003eBig block frame stands and motor mounts required for proper fit.\u003c\/li\u003e\n\u003cli\u003ewith Air Conditioning\u003c\/li\u003e\n\u003cli\u003eDoes not fit 4 speed applications with Factory Side bell housing mounts.\u003c\/li\u003e\n\u003cli\u003ewithout Catalytic Converter\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Doug's Headers","offers":[{"title":"Default Title","offer_id":54508699713749,"sku":"D303Y-B-BKLK","price":781.4,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2493\/0960\/files\/ab5b79af62fe23884d5c64a5cb525786.jpg?v=1786705382","url":"https:\/\/moderndaymuffler.com\/products\/tri-y-headers-for-68-91-gm-truck-396-502-bbc-1-3-4in-primary-d303y-b","provider":"Modern Day Muffler","version":"1.0","type":"link"}