{"product_id":"stainless-steel-long-tube-headers-for-gmc-c-k-trucks-1979-1985-5-0l-5-7l","title":"Stainless Steel Long Tube Headers for GMC C\/K Trucks (1979-1985) 5.0L 5.7L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eHigh-Flow Stainless Steel Long Tube Headers for 1979-1985 GMC C\/K Trucks (Squarebody)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Stainless Steel Long Tube Headers replace the restrictive cast iron exhaust manifolds on 1979-1985 GMC C\/K Trucks to optimize exhaust scavenging, relieve backpressure, and increase low-to-mid range torque.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock GMC C\/K Trucks Exhaust Restriction\u003c\/h3\u003e\n\u003cp\u003eFactory exhaust systems on third-generation \u003cstrong\u003eSquarebody\u003c\/strong\u003e platforms rely on heavy log-style cast iron manifolds. These OEM units feature short, uneven runner lengths and rough interior casting walls that create severe turbulence and high exhaust gas backpressure. Cylinder pairing is poor, preventing natural inertial scavenging between firing cycles. Under load or during heavy towing, this restriction traps exhaust heat near the cylinder heads, slowing combustion chamber evacuation, dulling throttle response, and suffocating the \u003cstrong\u003eSmall Block Chevy (SBC)\u003c\/strong\u003e 305 and 350 engines in their critical mid-range power bands.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eEngineered for high-duty cycles, these long tube headers feature smooth, CNC mandrel-bent \u003cstrong\u003eT-304 stainless steel\u003c\/strong\u003e primary tubing measuring 1-5\/8 inches in outer diameter. The tuned runner lengths guide spent gases into merged 3-inch collectors, producing an exhaust scavenging wave that siphons residual combustion gases out of the chambers during valve overlap. Thick, precision CNC-machined cylinder head flanges eliminate the heat-cycling warpage and carbon blow-by common to thin stamped steel or worn cast iron. The corrosion-resistant stainless finish withstands severe thermal stress without degradation.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2 Long Tube Headers (Left and Right)\u003c\/li\u003e\n  \u003cli\u003e2 Collector Reducers\u003c\/li\u003e\n  \u003cli\u003e2 Header Gaskets\u003c\/li\u003e\n  \u003cli\u003eCollector Gaskets\u003c\/li\u003e\n  \u003cli\u003eMounting Bolts and Nuts\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n  \u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; min-width: 300px;\"\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e1979-1985 GMC C\/K Trucks\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eSBC 305 (5.0L) \/ SBC 350 (5.7L) \/ Squarebody (Third Gen C\/K)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e160-175 hp \/ 235-275 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1979-1985 GMC C1500 Pickup Small Block V8 (5.0L 305ci, 5.7L 350ci)\u003c\/li\u003e\n  \u003cli\u003e1979-1985 GMC C\/K 1500, 2500, 3500 Series Trucks (2WD \/ 4WD Small Block V8)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the Squarebody C\/K Trucks?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct bolt-on fit for 1979-1985 GMC C\/K Trucks equipped with the \u003cstrong\u003eSmall Block Chevy\u003c\/strong\u003e 5.0L (305) and 5.7L (350) V8 engines in both 2WD and 4WD configurations.\u003c\/p\u003e\n\n\u003ch4\u003eAre these headers legal for highway use in emissions-controlled states?\u003c\/h4\u003e\n\u003cp\u003eNo, these headers are designed for off-road and competition use only and are not CARB-compliant, making them illegal for street use in California or states following CARB standards.\u003c\/p\u003e\n\n\u003ch3\u003eThe GMC Heavy-Duty Standard\u003c\/h3\u003e\n\u003cp\u003eBuilt for the working truck, these headers provide the structural integrity and scavenging efficiency necessary to generate sustained low-rpm pulling power, cooler cylinder head temperatures, and dependable reliability under heavy hauling and towing conditions.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67896026071288,"sku":"DS-E6DAUQNM0","price":237.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/stainless-steel-long-tube-headers-for-gmc-c-k-trucks-1979-1985-5-0l-5-7l-1.jpg?v=1793291119","url":"https:\/\/performancechiptuning.com\/de\/products\/stainless-steel-long-tube-headers-for-gmc-c-k-trucks-1979-1985-5-0l-5-7l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}