{"product_id":"performance-radiator-with-shroud-for-gmc-c-k-trucks-1975-1978-4-1l-4-8l-5-0l-5-7l","title":"Performance Radiator with Shroud for GMC C\/K Trucks (1975-1978) 4.1L 4.8L 5.0L 5.7L","description":"\u003ch2\u003eHigh-Efficiency Aluminum Performance Radiator with Shroud for 1975-1978 GMC C\/K Trucks\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The All-Aluminum Performance Radiator with Shroud replaces the failure-prone factory cooling assembly on 1975-1978 GMC C\/K Trucks to lower operating temperatures and eliminate boilover under heavy load.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock GMC C\/K Trucks Cooling Deficiencies\u003c\/h3\u003e\n\u003cp\u003eFactory cooling systems on 1970s \u003cstrong\u003eSquarebody GMC C\/K Trucks\u003c\/strong\u003e rely on aged copper-brass cores and mechanical clutch fans that struggle against modern heat demands. Over decades of heat cycling, factory brazed tank seams suffer fatigue cracking, internal passages succumb to mineral scale occlusion, and solder bloom severely impedes thermal transfer. Furthermore, the stock engine-driven fan draws insufficient cubic feet per minute (CFM) at idle and low-speed crawling, precipitating severe heat soak, elevated cylinder head temperatures, and vapor lock when towing.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis performance cooling assembly upgrades the system with lightweight, aircraft-grade T-6061 aluminum construction. The high-density furnace-brazed tube-and-fin core drastically increases convective surface contact, while 100% precision TIG-welded end tanks eliminate leaky crimped or soldered joints. Engineered with an application-specific aluminum shroud and integrated high-CFM electric fan, this unit drives forced laminar airflow across the entire fin matrix regardless of engine RPM, eliminating parasitic crankshaft drag and providing consistent thermal dissipation for both \u003cstrong\u003eInline-6\u003c\/strong\u003e and \u003cstrong\u003eSmall Block V8\u003c\/strong\u003e powertrains.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; margin-bottom: 20px;\"\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;\"\u003e1975-1978 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;\"\u003e4.1L, 4.8L I6 \/ 5.0L, 5.7L SBC V8 \/ 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;\"\u003e100-165 hp \/ 175-260 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;\"\u003eCC161, MC161, DPI161, CU161, 3023837, 3025223, 3005745\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1975-1978 GMC C15 \/ C1500 Pickup (4.1L 250ci, 4.8L 292ci, 5.0L 305ci, 5.7L 350ci)\u003c\/li\u003e\n  \u003cli\u003e1975-1978 GMC C25 \/ C2500 Pickup (4.1L 250ci, 4.8L 292ci, 5.0L 305ci, 5.7L 350ci)\u003c\/li\u003e\n  \u003cli\u003e1975-1978 GMC C35 \/ C3500 Pickup (4.8L 292ci, 5.7L 350ci)\u003c\/li\u003e\n  \u003cli\u003e1975-1978 GMC K15 \/ K1500 4WD Pickup (4.1L 250ci, 5.0L 305ci, 5.7L 350ci)\u003c\/li\u003e\n  \u003cli\u003e1975-1978 GMC K25 \/ K2500 4WD Pickup (4.1L 250ci, 4.8L 292ci, 5.7L 350ci)\u003c\/li\u003e\n  \u003cli\u003e1975-1978 GMC K35 \/ K3500 4WD Pickup (4.8L 292ci, 5.7L 350ci)\u003c\/li\u003e\n  \u003cli\u003e1975-1978 GMC Jimmy \/ Suburban (4.1L 250ci, 5.0L 305ci, 5.7L 350ci)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the Squarebody C\/K Trucks?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 1975-1978 GMC C\/K Trucks equipped with the \u003cstrong\u003e4.1L, 4.8L, 5.0L, or 5.7L\u003c\/strong\u003e engine configurations.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this convert the truck away from the factory mechanical fan?\u003c\/strong\u003e\u003cbr\u003e Yes, the integrated shroud and electric fan replace the factory mechanical clutch fan assembly, reducing parasitic drag while delivering superior low-speed airflow.\u003c\/p\u003e\n\n\u003ch3\u003eThe GMC Heavy-Duty Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered for maximum thermal overhead, this cooling system reinforces your classic GMC truck with the robust durability required for severe-duty hauling, steep mountain grades, and heavy bumper-pull towing.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50593927528696,"sku":"DS-EMBD5MITG","price":320.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/performance-radiator-with-shroud-for-gmc-c-k-trucks-1975-1978-4-1l-4-8l-5-0l-5-7l-1.jpg?v=1790053227","url":"https:\/\/performancechiptuning.com\/fr\/products\/performance-radiator-with-shroud-for-gmc-c-k-trucks-1975-1978-4-1l-4-8l-5-0l-5-7l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}