Tri-Y Headers for 65-81 GM 265-400 SBC 1-5/8in Primary Ceramic Coated D375Y

Overview:

65-77 Various GM 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. This fitment is tailored for popular aftermarket engine swap kits. Doug's engine swap headers were developed to solve common fitment issues in tight spaces, making your swap process smoother. No more guesswork or modifications needed - just straightforward installations that save you time and frustration.

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: Silver
• Cylinder Head Port Shape: Oval
• Design: Tri-Y
• 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: Tri-Y
• 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 65-81 Various GM 265-400 SBC 1 5/8-2" Primary 2 1/2" Collector Silver Ceramic Coated D375Y
• Tube Wall Thickness: 16 GU
• Part Number: D375Y

Applications:

• 1965-1966 Chevrolet C10 Pickup 283 CID
• 1966-1966 Chevrolet C10 Pickup 327 CID
• 1965-1966 Chevrolet C20 Pickup 283 CID
• 1968-1968 Chevrolet Chevy II 307 CID
• 1968-1968 Chevrolet Chevy II 327 CID
• 1968-1973 Chevrolet Chevelle 307 CID
• 1968-1973 Chevrolet Chevelle 350 CID
• 1968-1968 Chevrolet Chevelle 327 CID
• 1970-1973 Chevrolet Chevelle 400 CID
• 1965-1969 Chevrolet Bel Air 327 CID
• 1965-1967 Chevrolet Bel Air 283 CID
• 1968-1968 Chevrolet Bel Air 307 CID
• 1967-1974 Chevrolet Camaro 350 CID
• 1967-1969 Chevrolet Camaro 302 CID
• 1969-1973 Chevrolet Camaro 307 CID
• 1966-1969 Chevrolet Caprice 327 CID
• 1966-1967 Chevrolet Caprice 283 CID
• 1968-1973 Chevrolet Caprice 307 CID
• 1970-1974 Chevrolet Caprice 400 CID
• 1955-1956 Chevrolet Corvette 265 CID
• 1957-1961 Chevrolet Corvette 283 CID
• 1962-1962 Chevrolet Corvette 327 CID
• 1968-1977 Chevrolet El Camino 350 CID
• 1968-1973 Chevrolet El Camino 307 CID
• 1968-1969 Chevrolet El Camino 327 CID
• 1970-1976 Chevrolet El Camino 400 CID
• 1976-1977 Chevrolet El Camino 305 CID
• 1965-1969 Chevrolet Impala 327 CID
• 1965-1967 Chevrolet Impala 283 CID
• 1968-1973 Chevrolet Impala 307 CID
• 1969-1974 Chevrolet Impala 350 CID
• 1970-1974 Chevrolet Impala 400 CID
• 1973-1977 Chevrolet Malibu 350 CID
• 1973-1976 Chevrolet Malibu 400 CID
• 1973-1973 Chevrolet Malibu 307 CID
• 1976-1977 Chevrolet Malibu 305 CID
• 1969-1974 Chevrolet Nova 350 CID
• 1969-1973 Chevrolet Nova 307 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.
• Requires removal or modification of locking steering columns if equipped.
• Does not fit 67-69 Camaro with A/C.