{"product_id":"radiator-for-gmc-jimmy-1970-1972-4-1l-4-8l","title":"Radiator for GMC Jimmy (1970-1972) 4.1L 4.8L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eHigh-Efficiency 3-Row Aluminum Crossflow Radiator for 1970-1972 GMC Jimmy (K5 Chassis)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The 3-row aluminum crossflow radiator replaces the heat-fatigued factory copper-brass heat exchanger on the 1970-1972 GMC Jimmy to dramatically maximize heat dissipation efficiency and eliminate boiling during heavy-load operation.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock GMC Jimmy Thermal Transfer Bottleneck\u003c\/h3\u003e\n\u003cp\u003eFactory cooling systems in the 1970-1972 \u003cstrong\u003eK5\u003c\/strong\u003e Jimmy rely on aged copper-brass cores joined by lead solder. Over decades of thermal cycling, these original units suffer from internal tube scaling, galvanic corrosion, and separated fins that drastically inhibit conductive thermal transfer. When crawling at low speeds or pulling sustained grades, the factory radiator cannot shed heat fast enough from the high-torque \u003cstrong\u003e250 ci (4.1L)\u003c\/strong\u003e and \u003cstrong\u003e292 ci (4.8L)\u003c\/strong\u003e inline-six powerplants, resulting in heat soak, coolant boil-off, and potential head gasket failure.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis heavy-duty upgrade utilizes a high-density 3-row aluminum crossflow core measuring 26.26 x 16.06 x 2.00 inches. Fabricated with fully TIG-welded aluminum end tanks rather than failure-prone crimped or soldered joints, it resists pressure spikes and elevated operating temperatures. The crossflow architecture channels coolant horizontally across high-surface-area louvered aluminum fins, significantly speeding up heat rejection before the fluid returns to the block through the 1.75-inch outlet.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 Radiator\u003c\/li\u003e\n  \u003cli\u003e1 Radiator Cap\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;\"\u003e1970-1972 GMC Jimmy\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;\"\u003eInline-6 (250 \/ 292) \/ K5 Platform\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;\"\u003e145-170 hp \/ 235-280 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\u003e1970-1972 GMC Jimmy 4.1L (Fits inline-6 models utilizing a 26.5-inch wide core)\u003c\/li\u003e\n  \u003cli\u003e1970-1972 GMC Jimmy 4.8L (Fits inline-6 models utilizing a 26.5-inch wide core)\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 K5 Jimmy?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 1970-1972 GMC Jimmy equipped with the \u003cstrong\u003e4.1L\u003c\/strong\u003e or \u003cstrong\u003e4.8L\u003c\/strong\u003e inline-six engines using a 26.5-inch wide core mounting configuration. \u003cstrong\u003eIt does not fit V8 models or applications configured for narrow-width core supports without bracket modification.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch4\u003eIs professional installation recommended?\u003c\/h4\u003e\n\u003cp\u003eYes, direct replacement mounting aligns with factory locations, but professional installation is advised to guarantee proper coolant burping and hose clearance.\u003c\/p\u003e\n\n\u003ch3\u003eThe GMC Truck Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered for rugged vintage truck use, this heavy-duty cooling assembly provides the thermal headroom required for low-RPM rock crawling, remote trail recovery, and prolonged highway hauling without temperature creep.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67564539248888,"sku":"DS-EKUSZEOM0","price":123.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/radiator-for-gmc-jimmy-1970-1972-4-1l-4-8l-1.jpg?v=1791041681","url":"https:\/\/performancechiptuning.com\/de\/products\/radiator-for-gmc-jimmy-1970-1972-4-1l-4-8l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}