Tri-Y Headers for 63-91 GM Truck 265-400 SBC 2/4 WD 1-5/8in Primary D300Y

Overview:

63-91 GM Truck SBC Tri Y Silver 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
• Cylinder Head Port Shape: Oval
• Design: Full-length
• EGT Port: No
• Finish: Metallic Ceramic Coated
• 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: Oval
• Primary Tube Outside Diameter: 1.625 IN
• Primary Tubing Diameter: 1.625 IN
• Prop 65 (C, R or CR): CR
• Prop 65 Yes/No: Yes
• Sheen Level: Semi-Gloss
• Title: Doug's Tri Y Header 63-91 GM Truck 265-400 SBC 2 & 4 WD 1 5/8-2" Primary 2 1/2" Collector Silver Ceramic Coated D300Y
• Tube Wall Thickness: 16 GU
• Part Number: D300Y

Applications:

• 1963-1967 Chevrolet C10 Pickup 283 CID
• 1966-1969 Chevrolet C10 Pickup 327 CID
• 1968-1973 Chevrolet C10 Pickup 307 CID
• 1969-1974 Chevrolet C10 Pickup 350 CID
• 1963-1967 Chevrolet C20 Pickup 283 CID
• 1966-1969 Chevrolet C20 Pickup 327 CID
• 1968-1973 Chevrolet C20 Pickup 307 CID
• 1969-1974 Chevrolet C20 Pickup 350 CID
• 1963-1967 Chevrolet C30 Pickup 283 CID
• 1966-1969 Chevrolet C30 Pickup 327 CID
• 1968-1973 Chevrolet C30 Pickup 307 CID
• 1969-1974 Chevrolet C30 Pickup 350 CID
• 1963-1967 Chevrolet K10 Pickup 283 CID
• 1966-1969 Chevrolet K10 Pickup 327 CID
• 1969-1974 Chevrolet K10 Pickup 350 CID
• 1963-1967 Chevrolet K20 Pickup 283 CID
• 1966-1969 Chevrolet K20 Pickup 327 CID
• 1968-1973 Chevrolet K20 Pickup 307 CID
• 1969-1974 Chevrolet K20 Pickup 350 CID
• 1968-1973 Chevrolet K30 Pickup 307 CID
• 1968-1969 Chevrolet K30 Pickup 327 CID
• 1969-1974 Chevrolet K30 Pickup 350 CID
• 1963-1965 Chevrolet Suburban 283 CID
• 1966-1966 Chevrolet Suburban 327 CID
• 1969-1991 Chevrolet Blazer 350 CID
• 1969-1973 Chevrolet Blazer 307 CID
• 1987-1987 Chevrolet Blazer 305 CID
• 1975-1986 Chevrolet K5 Blazer 350 CID
• 1975-1979 Chevrolet K5 Blazer 400 CID
• 1977-1986 Chevrolet K5 Blazer 305 CID
• 1975-1986 Chevrolet C10 350 CID
• 1976-1980 Chevrolet C10 400 CID
• 1977-1986 Chevrolet C10 305 CID
• 1967-1969 Chevrolet C10 Suburban 327 CID
• 1967-1967 Chevrolet C10 Suburban 283 CID
• 1968-1973 Chevrolet C10 Suburban 307 CID
• 1969-1986 Chevrolet C10 Suburban 350 CID
• 1977-1986 Chevrolet C10 Suburban 305 CID
• 1975-1987 Chevrolet C20 350 CID
• 1976-1980 Chevrolet C20 400 CID
• 1977-1986 Chevrolet C20 305 CID
• 1967-1969 Chevrolet C20 Suburban 327 CID
• 1967-1967 Chevrolet C20 Suburban 283 CID
• 1968-1973 Chevrolet C20 Suburban 307 CID
• 1969-1986 Chevrolet C20 Suburban 350 CID
• 1976-1980 Chevrolet C20 Suburban 400 CID
• 1977-1986 Chevrolet C20 Suburban 305 CID
• 1975-1986 Chevrolet C30 350 CID
• 1976-1978 Chevrolet C30 400 CID
• 1978-1978 Chevrolet C30 305 CID
• 1975-1986 Chevrolet K10 350 CID
• 1975-1980 Chevrolet K10 400 CID
• 1977-1986 Chevrolet K10 305 CID
• 1967-1969 Chevrolet K10 Suburban 327 CID
• 1967-1967 Chevrolet K10 Suburban 283 CID
• 1968-1973 Chevrolet K10 Suburban 307 CID
• 1969-1986 Chevrolet K10 Suburban 350 CID
• 1975-1979 Chevrolet K10 Suburban 400 CID
• 1977-1986 Chevrolet K10 Suburban 305 CID
• 1975-1986 Chevrolet K20 350 CID
• 1975-1980 Chevrolet K20 400 CID
• 1977-1985 Chevrolet K20 305 CID
• 1967-1969 Chevrolet K20 Suburban 327 CID
• 1967-1967 Chevrolet K20 Suburban 283 CID
• 1968-1973 Chevrolet K20 Suburban 307 CID
• 1969-1986 Chevrolet K20 Suburban 350 CID
• 1975-1980 Chevrolet K20 Suburban 400 CID
• 1977-1986 Chevrolet K20 Suburban 305 CID
• 1977-1986 Chevrolet K30 350 CID
• 1977-1980 Chevrolet K30 400 CID
• 1987-1987 Chevrolet R10 350 CID
• 1987-1987 Chevrolet R10 305 CID
• 1987-1988 Chevrolet R10 Suburban 350 CID
• 1987-1987 Chevrolet R10 Suburban 305 CID
• 1989-1991 Chevrolet R1500 Suburban 350 CID
• 1987-1988 Chevrolet R20 305 CID
• 1987-1988 Chevrolet R20 Suburban 350 CID
• 1989-1989 Chevrolet R2500 350 CID
• 1989-1991 Chevrolet R2500 Suburban 350 CID
• 1987-1988 Chevrolet R30 350 CID
• 1989-1991 Chevrolet R3500 350 CID
• 1987-1987 Chevrolet V10 350 CID
• 1987-1987 Chevrolet V10 305 CID
• 1987-1988 Chevrolet V10 Suburban 350 CID
• 1989-1991 Chevrolet V1500 Suburban 350 CID
• 1987-1987 Chevrolet V20 350 CID
• 1987-1988 Chevrolet V20 Suburban 350 CID
• 1989-1991 Chevrolet V2500 Suburban 350 CID
• 1987-1988 Chevrolet V30 350 CID
• 1989-1991 Chevrolet V3500 350 CID
• 1963-1963 GMC 1000 Series 283 CID
• 1963-1963 GMC 2500 Series 283 CID
• 1967-1968 GMC C15/C1500 Pickup 327 CID
• 1967-1967 GMC C15/C1500 Pickup 283 CID
• 1969-1974 GMC C15/C1500 Pickup 350 CID
• 1967-1968 GMC C15/C1500 Suburban 327 CID
• 1967-1967 GMC C15/C1500 Suburban 283 CID
• 1968-1973 GMC C15/C1500 Suburban 307 CID
• 1969-1974 GMC C15/C1500 Suburban 350 CID
• 1967-1968 GMC C25/C2500 Pickup 327 CID
• 1967-1967 GMC C25/C2500 Pickup 283 CID
• 1968-1973 GMC C25/C2500 Pickup 307 CID
• 1969-1974 GMC C25/C2500 Pickup 350 CID
• 1967-1973 GMC C25/C2500 Suburban 327 CID
• 1969-1974 GMC C25/C2500 Suburban 350 CID
• 1967-1968 GMC C35/C3500 Pickup 327 CID
• 1967-1967 GMC C35/C3500 Pickup 283 CID
• 1968-1973 GMC C35/C3500 Pickup 307 CID
• 1969-1974 GMC C35/C3500 Pickup 350 CID
• 1967-1968 GMC K15/K1500 Pickup 327 CID
• 1967-1967 GMC K15/K1500 Pickup 283 CID
• 1968-1973 GMC K15/K1500 Pickup 307 CID
• 1969-1974 GMC K15/K1500 Pickup 350 CID
• 1967-1968 GMC K15/K1500 Suburban 327 CID
• 1967-1967 GMC K15/K1500 Suburban 283 CID
• 1968-1973 GMC K15/K1500 Suburban 307 CID
• 1969-1974 GMC K15/K1500 Suburban 350 CID
• 1967-1968 GMC K25/K2500 Pickup 327 CID
• 1968-1973 GMC K25/K2500 Pickup 307 CID
• 1969-1974 GMC K25/K2500 Pickup 350 CID
• 1967-1968 GMC K25/K2500 Suburban 327 CID
• 1967-1967 GMC K25/K2500 Suburban 283 CID
• 1968-1973 GMC K25/K2500 Suburban 307 CID
• 1969-1974 GMC K25/K2500 Suburban 350 CID
• 1968-1973 GMC K35/K3500 Pickup 307 CID
• 1968-1968 GMC K35/K3500 Pickup 327 CID
• 1969-1974 GMC K35/K3500 Pickup 350 CID
• 1979-1986 GMC C1500 350 CID
• 1979-1986 GMC C1500 305 CID
• 1979-1980 GMC C1500 400 CID
• 1979-1986 GMC C1500 Suburban 305 CID
• 1979-1986 GMC C1500 Suburban 350 CID
• 1979-1986 GMC C2500 350 CID
• 1979-1979 GMC C2500 400 CID
• 1980-1986 GMC C2500 305 CID
• 1979-1986 GMC C2500 Suburban 350 CID
• 1980-1980 GMC C2500 Suburban 400 CID
• 1982-1986 GMC C2500 Suburban 305 CID
• 1979-1986 GMC C3500 350 CID
• 1979-1979 GMC C3500 400 CID
• 1986-1986 GMC C3500 305 CID
• 1979-1986 GMC K1500 350 CID
• 1979-1980 GMC K1500 400 CID
• 1981-1986 GMC K1500 305 CID
• 1979-1986 GMC K1500 Suburban 350 CID
• 1979-1980 GMC K1500 Suburban 400 CID
• 1982-1982 GMC K1500 Suburban 305 CID
• 1979-1986 GMC K2500 350 CID
• 1979-1980 GMC K2500 400 CID
• 1979-1986 GMC K2500 Suburban 350 CID
• 1979-1980 GMC K2500 Suburban 400 CID
• 1979-1986 GMC K3500 350 CID
• 1979-1980 GMC K3500 400 CID
• 1987-1991 GMC R1500 Suburban 350 CID
• 1987-1989 GMC R2500 350 CID
• 1987-1987 GMC R2500 305 CID
• 1987-1991 GMC R2500 Suburban 350 CID
• 1987-1991 GMC R3500 350 CID
• 1976-1978 GMC C15 400 CID
• 1977-1978 GMC C15 305 CID
• 1975-1978 GMC C15 Suburban 350 CID
• 1977-1978 GMC C15 Suburban 305 CID
• 1975-1978 GMC C25 350 CID
• 1976-1978 GMC C25 400 CID
• 1975-1978 GMC C25 Suburban 350 CID
• 1977-1978 GMC C25 Suburban 305 CID
• 1978-1978 GMC C25 Suburban 400 CID
• 1975-1978 GMC C35 350 CID
• 1976-1978 GMC C35 400 CID
• 1978-1978 GMC C35 305 CID
• 1970-1991 GMC Jimmy 350 CID
• 1970-1973 GMC Jimmy 307 CID
• 1975-1979 GMC Jimmy 400 CID
• 1977-1987 GMC Jimmy 305 CID
• 1975-1978 GMC K15 400 CID
• 1977-1978 GMC K15 305 CID
• 1975-1978 GMC K15 Suburban 350 CID
• 1975-1978 GMC K15 Suburban 400 CID
• 1975-1978 GMC K25 350 CID
• 1975-1978 GMC K25 400 CID
• 1977-1978 GMC K25 305 CID
• 1975-1978 GMC K25 Suburban 350 CID
• 1975-1978 GMC K25 Suburban 400 CID
• 1977-1978 GMC K25 Suburban 305 CID
• 1977-1978 GMC K35 400 CID
• 1977-1978 GMC K35 350 CID
• 1987-1987 GMC R1500 350 CID
• 1987-1987 GMC R1500 305 CID
• 1987-1987 GMC V1500 305 CID
• 1987-1987 GMC V1500 350 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:

• Fits most angle plug heads.
• Fits D-Port cylinder heads including ZZ4 crate engines. Will Not fit GM Fast Burn head PN 19300955 or SP350, SP383 and ZZ6 engines.
• Installation requires left side A/C bracket part number H7608.
• Tri Y design. This long tube header has excellent ground clearance with collector above the bottom of the frame rails.
• 63-67 C10/C20/1000/2000/C15/C1500/C25/C2500 4.6L Works with Coil Spring front suspension Only, NOT Torsion Bar.