THY-364Y-C / 1973-87 GM pickup truck 1/2ton /1973-91 pickup truck 3/4 & 1 ton 265-400 4wd (no y-pipe)

  Long Tube Tri-Y Headers with Adapters265-400 Small Block V8 (no smog fittings)1973-87 Chevrolet GMC K1500 Pickup Truck / Suburban / Blazer / GMC JimmyApplication notes: 4WD only | Fit with straight or angle plug heads | Will not seal properly on D-port cylinder heads1973-91 Chevrolet GMC K2500 K3500 Pickup Truck / Suburban / Blazer / JimmyApplication notes: 4WD only | Fit with straight or angle plug heads | Will not seal properly on D-port cylinder headsHeader Style: 4:2:1 Tri-Y HeadersMaterial: SteelFinish: Silver Ceramic CoatedWeld Up: Yes, adapters must be welded to exhaust systemPrimary Tube Diameter: 1-5/8"Primary Tube Gauge: 14 GaugeCollector Attachment: 3 Bolt FlangeCollector Diameter: 2-1/2"Tuned: NoFlange Thickness: 3/8"Bolts and/or Studs Included: YesGaskets Included: YesReducers/Adapters Included: YesY-Pipe (Crossover) Included: NoQuantity: Sold as a PairCARB E.O. #: D-540-5Warranty: Limited Lifetime to original purchaserHeader Information: Backed by over 50 years of knowl