Tri-Y Headers for 78-88 GM G Body 265-400 SBC 1-5/8in Primary D370Y

Overview:Header GM G Body SBC 78-87 CtdDoug'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: 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 78-88 GM G Body 265-400 SBC 1 5/8-2" Primary 2 1/2" Collector Silver Ceramic Coated D370Y Tube Wall Thickness: 16 GU Part Number: D370Y Applications: 1978-1987 Chevrolet El Camino 305 CID 1978-1984 Chevrolet El Camino 350 CID 1979-1982 Chevrolet El Camino 267 CID 1978-1983 Chevrolet Malibu 305 CID 1978-1983 Chevrolet Malibu 350 CID 1979-1982 Chevrolet Malibu 267 CID 1978-1988 Chevrolet Monte Carlo 305 CID 1979-1982 Chevrolet Monte Carlo 267 CID 1982-1984 Chevrolet Monte Carlo 350 CID 1978-1980 Oldsmobile Cutlass 305 CID 1978-1979 Oldsmobile Cutlass 350 CID 1983-1986 Pontiac Bonneville 305 CID 1978-1987 Pontiac Grand Prix 305 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. Installation requires left side A/C bracket part number H7608. 1979 and later vehicles with short compressors can use the stock bracket. Fits Factory Installed Chevrolet 265-350 small block engines. Does not fit with power glide transmission.