{"product_id":"shorty-stainless-steel-headers-for-chevrolet-chevelle-el-camino-1969-1974-big-block-396-402-427-454","title":"Shorty Stainless Steel Headers for Chevrolet Chevelle El Camino (1969-1974) Big Block 396 402 427 454","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eHigh-Flow Shorty Stainless Steel Headers for 1969-1974 Chevrolet Chevelle, El Camino (A-body)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The shorty stainless steel headers replace restrictive factory cast-iron manifolds on the 1969-1974 Chevrolet Chevelle and El Camino to reduce backpressure and accelerate exhaust gas scavenging.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Chevrolet Chevelle, El Camino Exhaust Restriction\u003c\/h3\u003e\n\u003cp\u003eFactory cast-iron log manifolds on the \u003cstrong\u003eGM A-body\u003c\/strong\u003e platform severely restrict the displacement demands of the \u003cstrong\u003eMark IV Big Block\u003c\/strong\u003e V8. Their unequal, tight-radius internal runners generate high exhaust gas backpressure, trap immense thermal mass inside the engine bay, and trigger exhaust reversion into the combustion chamber, blunting high-RPM horsepower and throttle response.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eFabricated from heavy-duty, mandrel-bent \u003cstrong\u003eT-304 stainless steel\u003c\/strong\u003e, these shorty headers feature true 1-3\/4 inch primary tubes routed into smooth 3.0 inch collectors to maximize scavenging velocity. Thick 3\/8-inch CNC-machined flanges resist heat-cycle warping and exhaust leaks at the cylinder head face. The compact shorty layout ensures optimal frame and steering linkage clearance on the \u003cstrong\u003eGM A-body\u003c\/strong\u003e chassis without sacrificing ground clearance.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2 Shorty 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\u003e2 Collector Gaskets\u003c\/li\u003e\n  \u003cli\u003eMounting Bolts\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;\"\u003e1969-1974 Chevrolet Chevelle, El Camino\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;\"\u003eMark IV Big Block (396, 402, 427, 454) \/ GM A-body\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;\"\u003e235-450 hp \/ 360-500 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\u003e1970-1973 Chevrolet Chevelle Big Block V8 (396, 402, 427, 454)\u003c\/li\u003e\n  \u003cli\u003e1969-1974 Chevrolet El Camino Big Block V8 (396, 402, 427, 454)\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 GM A-body Chevelle and El Camino?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct bolt-on fit for 1969-1974 Chevrolet Chevelle and El Camino models equipped with standard \u003cstrong\u003eMark IV Big Block\u003c\/strong\u003e engines; note that Generation 6 502 crate engines with aluminum cylinder heads may present head bolt clearance issues.\u003c\/p\u003e\n\n\u003ch4\u003eDo the header bolts require retorquing after installation?\u003c\/h4\u003e\n\u003cp\u003eYes, retorque all header flange bolts after the first three to five thermal heat cycles to ensure the gaskets stay fully compressed and sealed.\u003c\/p\u003e\n\n\u003ch3\u003eThe Chevrolet Muscle Caliber\u003c\/h3\u003e\n\u003cp\u003eDeliver the unrestrained breathing capacity and aggressive exhaust note your classic big block muscle car demands with rugged, precision-built stainless exhaust architecture.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67896023843064,"sku":"DS-EL05EW51Y","price":170.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/shorty-stainless-steel-headers-for-chevrolet-chevelle-el-camino-1969-1974-big-block-396-402-427-454-1.jpg?v=1793291050","url":"https:\/\/performancechiptuning.com\/fr\/products\/shorty-stainless-steel-headers-for-chevrolet-chevelle-el-camino-1969-1974-big-block-396-402-427-454","provider":"Performance Chip Tuning","version":"1.0","type":"link"}