{"title":"4BT Parts","description":null,"products":[{"product_id":"billet-welsh-plug-kits","title":"Cummins Leak Free Welsh (Freeze) Plugs","description":"\u003cul\u003e\n\u003cli\u003e\n\u003ch1\u003eLeak-Free Welsh (Freeze) Plugs for Cummins Engines\u003c\/h1\u003e\n\u003cp\u003eFactory welsh plugs are a known weak point on Cummins engines. Under increased boost and cylinder pressure, they can leak, loosen, or completely blow out—often resulting in coolant loss, downtime, and costly repairs.\u003c\/p\u003e\n\u003cp\u003eOur \u003cstrong\u003eLeak-Free Welsh Plug\u003c\/strong\u003e is engineered to permanently eliminate that problem. Precision-machined from billet materials and supplied with premium sealing hardware, it provides a robust, serviceable solution for \u003cstrong\u003e4BT, 12 Valve 6BT, 24 Valve ISB, and 6.7L Cummins\u003c\/strong\u003e engines.\u003c\/p\u003e\n\u003ch2\u003eHow Many Plugs Do I Need?\u003c\/h2\u003e\n\u003cp\u003eEach purchase includes \u003cstrong\u003eone complete Welsh Plug assembly\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRequired quantity per engine:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e4BT Cummins\u003c\/strong\u003e → \u003cstrong\u003e1 Plug\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e24 Valve ISB \/ 6.7L Cummins\u003c\/strong\u003e → \u003cstrong\u003e2 Plugs\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e12 Valve 6BT Cummins\u003c\/strong\u003e → \u003cstrong\u003e3 Plugs\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePlease ensure you order the correct quantity for your engine.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eWhy Choose EPC Leak-Free Welsh Plugs?\u003c\/h2\u003e\n\u003cp\u003e✅ \u003cstrong\u003eBillet Construction\u003c\/strong\u003e\u003cbr\u003ePrecision-machined for maximum strength, durability, and long-term reliability.\u003c\/p\u003e\n\u003cp\u003e✅ \u003cstrong\u003ePremium Sealing System\u003c\/strong\u003e\u003cbr\u003eSupplied with copper sealing washers and high-temperature Viton O-rings for exceptional sealing performance.\u003c\/p\u003e\n\u003cp\u003e✅ \u003cstrong\u003eBuilt for High-Boost Applications\u003c\/strong\u003e\u003cbr\u003eDesigned to withstand the pressures that commonly cause factory welsh plugs to fail.\u003c\/p\u003e\n\u003cp\u003e✅ \u003cstrong\u003eCorrosion-Resistant Hardware\u003c\/strong\u003e\u003cbr\u003eIncludes premium stainless steel hardware for long service life in harsh operating conditions.\u003c\/p\u003e\n\u003cp\u003e✅ \u003cstrong\u003eServiceable Design\u003c\/strong\u003e\u003cbr\u003eUnlike factory welsh plugs, our design can be removed, inspected, and reinstalled when required.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eWhat's Included?\u003c\/h2\u003e\n\u003cp\u003eEach Welsh Plug includes:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e6061 Billet Leak-Free Welsh (Freeze) Plug\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e316 Stainless Steel Coolant Gallery Bar\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCopper Sealing Washers\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-Temperature Viton O-Ring\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eStainless Steel Fastening Hardware\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003cp\u003eWhether you're building a high-horsepower street truck, competition vehicle, tow rig, or dependable workhorse, EPC Leak-Free Welsh Plugs provide the confidence and reliability your Cummins deserves.\u003c\/p\u003e\n\u003ch3\u003eLeak-Free for Life.\u003c\/h3\u003e\n\u003cp\u003eA strong Shopify addition would be a bold callout immediately under the title:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e⚠️ This listing is for ONE Welsh (Freeze) Plug. Most engines require multiple plugs. See the quantity guide below before ordering.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!----\u003e","brand":"Engineering Performance Concepts","offers":[{"title":"blue","offer_id":67294149836845,"sku":"BWPBU","price":47.99,"currency_code":"USD","in_stock":true},{"title":"black","offer_id":67294149869613,"sku":"BWPBK","price":47.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0771\/2459\/9853\/files\/WhatsApp_Image_2026-05-22_at_9.50.12_AM.jpg?v=1786334918"},{"product_id":"cummins-engine-barring-tool","title":"6BT \/ ISB  Cummins Engine Barring Tool","description":"\u003cp data-start=\"72\" data-end=\"248\"\u003e\u003cstrong data-start=\"72\" data-end=\"129\"\u003eEngineered for Precision: Cummins Engine Barring Tool\u003c\/strong\u003e\u003cbr data-start=\"129\" data-end=\"132\"\u003eMake timing your engine a breeze with the Cummins Engine Barring Tool from Engineering Performance Concepts!\u003c\/p\u003e\n\u003cp data-start=\"250\" data-end=\"622\"\u003eCrafted from high-quality\u003cstrong\u003e \u003c\/strong\u003ezinc-plated billet chromoly steel and EDM cut square 1\/2\" drive this tool ensures durability and strength, giving you the reliability you need for every engine build. No more hassle with complicated setups—our bearing tool easily bolts onto your crank using the stock mounting bolts and requires a 1\/2\" drive, saving you time and effort.\u003c\/p\u003e\n\u003cp data-start=\"624\" data-end=\"807\"\u003e\u003cstrong data-start=\"624\" data-end=\"669\"\u003ePerfect Fit for 1989-2018 Cummins Engines\u003c\/strong\u003e\u003cbr data-start=\"669\" data-end=\"672\"\u003eThis tool is designed to fit Cummins engines from 1989 to 2018, making engine timing an easy task for a wide range of applications.\u003c\/p\u003e\n\u003cp data-start=\"809\" data-end=\"1312\"\u003e\u003cstrong data-start=\"809\" data-end=\"822\"\u003eFeatures:\u003c\/strong\u003e\u003cbr data-start=\"822\" data-end=\"825\"\u003e✔ \u003cstrong data-start=\"827\" data-end=\"848\"\u003eEasy Installation\u003c\/strong\u003e: Mounts directly to your crank with stock bolts\u003cbr data-start=\"896\" data-end=\"899\"\u003e✔ \u003cstrong data-start=\"901\" data-end=\"930\"\u003e1\/2\" drive\u003c\/strong\u003e: Uses 1\/2\" square drive for added convenience\u003cbr data-start=\"998\" data-end=\"1001\"\u003e✔ \u003cstrong data-start=\"1003\" data-end=\"1021\"\u003eDurable Design\u003c\/strong\u003e: Built from zinc-plated billet chromoly steel for strength and corrosion resistance\u003cbr data-start=\"1089\" data-end=\"1092\"\u003e✔ \u003cstrong data-start=\"1094\" data-end=\"1114\"\u003ePrecision Timing\u003c\/strong\u003e: Achieve perfect timing with minimal effort\u003cbr data-start=\"1235\" data-end=\"1238\"\u003e✔ \u003cstrong data-start=\"1240\" data-end=\"1274\"\u003eFits 1989-2018 Cummins Engines\u003c\/strong\u003e: Suits a wide range of applications\u003c\/p\u003e\n\u003cp data-start=\"1314\" data-end=\"1453\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Engineering Performance Concepts","offers":[{"title":"Default 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data-end=\"269\"\u003e6061 aluminum\u003c\/strong\u003e\u003cbr data-start=\"269\" data-end=\"272\"\u003e✅ \u003cstrong data-start=\"274\" data-end=\"293\"\u003eAnodized finish\u003c\/strong\u003e for durability \u0026amp; corrosion resistance\u003cbr data-start=\"331\" data-end=\"334\"\u003e✅ \u003cstrong data-start=\"336\" data-end=\"348\"\u003eIncludes\u003c\/strong\u003e gasket \u0026amp; stainless hardware for a complete install\u003cbr data-start=\"399\" data-end=\"402\"\u003e✅ \u003cstrong data-start=\"404\" data-end=\"412\"\u003eFits\u003c\/strong\u003e 6BT \u0026amp; 4BT Cummins engines\u003c\/p\u003e","brand":"Engineering Performance Concepts","offers":[{"title":"Default Title","offer_id":67294150754349,"sku":"FPDK","price":24.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0771\/2459\/9853\/files\/Fuel_Pump_Delete_Plate_1.jpg?v=1786334924"},{"product_id":"4bt-tappet-cover","title":"4BT Tappet Cover","description":"\u003ch2 data-start=\"77\" data-end=\"152\"\u003e\u003cstrong data-start=\"80\" data-end=\"150\"\u003eBillet 4BT Tappet Cover \u0026amp; Baffle – Hard Anodized, Leak-Free Design\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"154\" data-end=\"317\"\u003eUpgrade your 4BT Cummins with EPC’s \u003cstrong data-start=\"190\" data-end=\"254\"\u003eprecision-engineered billet tappet cover and baffle assembly\u003c\/strong\u003e — built for strength, style, and zero compromise on sealing.\u003c\/p\u003e\n\u003cp data-start=\"319\" data-end=\"351\"\u003e\u003cstrong data-start=\"319\" data-end=\"349\"\u003eWhy This Cover Stands Out:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"352\" data-end=\"787\"\u003e\n\u003cli data-start=\"352\" data-end=\"462\"\u003e\n\u003cp data-start=\"354\" data-end=\"462\"\u003e\u003cstrong data-start=\"354\" data-end=\"387\"\u003eBillet Aluminium Construction\u003c\/strong\u003e – CNC-machined from solid aluminium for maximum strength and durability.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"463\" data-end=\"554\"\u003e\n\u003cp data-start=\"465\" data-end=\"554\"\u003e\u003cstrong data-start=\"465\" data-end=\"489\"\u003eHard Anodized Finish\u003c\/strong\u003e – Rugged corrosion resistance with a sleek, professional look.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"555\" data-end=\"642\"\u003e\n\u003cp data-start=\"557\" data-end=\"642\"\u003e\u003cstrong data-start=\"557\" data-end=\"577\"\u003eLeak-Free Design\u003c\/strong\u003e – Precision O-ring sealing eliminates messy gaskets and drips.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"643\" data-end=\"724\"\u003e\n\u003cp data-start=\"645\" data-end=\"724\"\u003e\u003cstrong data-start=\"645\" data-end=\"666\"\u003eIntegrated Baffle\u003c\/strong\u003e – Controls oil splash for better crankcase ventilation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"725\" data-end=\"787\"\u003e\n\u003cp data-start=\"727\" data-end=\"787\"\u003e\u003cstrong data-start=\"727\" data-end=\"741\"\u003eDirect Fit\u003c\/strong\u003e – Bolt-on replacement for the factory unit.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"789\" data-end=\"807\"\u003e\u003cstrong data-start=\"789\" data-end=\"805\"\u003ePerfect For:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"808\" data-end=\"889\"\u003e\n\u003cli data-start=\"808\" data-end=\"830\"\u003e\n\u003cp data-start=\"810\" data-end=\"830\"\u003ePerformance builds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"831\" data-end=\"854\"\u003e\n\u003cp data-start=\"833\" data-end=\"854\"\u003eEngine bay dress-up\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"855\" data-end=\"889\"\u003e\n\u003cp data-start=\"857\" data-end=\"889\"\u003eLong-term reliability upgrades\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"891\" data-end=\"910\"\u003e\u003cstrong data-start=\"891\" data-end=\"908\"\u003eKit Includes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"911\" data-end=\"1009\"\u003e\n\u003cli data-start=\"911\" data-end=\"944\"\u003e\n\u003cp data-start=\"913\" data-end=\"944\"\u003eBillet aluminium tappet cover\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"945\" data-end=\"966\"\u003e\n\u003cp data-start=\"947\" data-end=\"966\"\u003eIntegrated baffle\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"967\" data-end=\"982\"\u003e\n\u003cp data-start=\"969\" data-end=\"982\"\u003eO-ring seal\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"983\" data-end=\"1009\"\u003e\n\u003cp data-start=\"985\" data-end=\"1009\"\u003eAll necessary hardware\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1011\" data-end=\"1145\"\u003eWhen you want \u003cstrong data-start=\"1025\" data-end=\"1042\"\u003eCNC precision\u003c\/strong\u003e and \u003cstrong data-start=\"1047\" data-end=\"1072\"\u003eleak-free performance\u003c\/strong\u003e, EPC delivers — this is the last tappet cover your 4BT will ever need.\u003c\/p\u003e","brand":"Engineering Performance Concepts","offers":[{"title":"Default Title","offer_id":67294152032301,"sku":null,"price":229.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0771\/2459\/9853\/files\/4BTTCC.jpg?v=1786334928"},{"product_id":"cummins-leak-free-rear-welsh-plug","title":"Leak-Free Rear Welsh Plug for 4BT and 6BT Cummins","description":"\u003ch1\u003eLeak-Free Rear Welsh (Freeze) Plug for 4BT \u0026amp; 6BT Cummins\u003c\/h1\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe factory rear welsh plug is a common failure point on Cummins engines, especially in high-performance, towing, and heavy-duty applications. Increased boost and cylinder pressures can cause factory plugs to leak or blow out, leading to coolant loss, downtime, and expensive repairs.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eEPC Leak-Free Rear Welsh (Freeze) Plug\u003c\/strong\u003e is engineered to provide a permanent solution. Precision-machined from billet material and supplied with premium sealing components, it delivers superior strength, reliability, and serviceability compared to the factory design.\u003c\/p\u003e\n\u003ch2\u003eVehicle Compatibility\u003c\/h2\u003e\n\u003cp\u003e✔ 4BT Cummins\u003cbr\u003e✔ 6BT 12 Valve Cummins\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOnly one rear plug is required per engine.\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eWhy Choose the EPC Rear Welsh Plug?\u003c\/h2\u003e\n\u003cp\u003e✅ \u003cstrong\u003eBillet Construction\u003c\/strong\u003e\u003cbr\u003ePrecision-machined for exceptional strength and long-term durability.\u003c\/p\u003e\n\u003cp\u003e✅ \u003cstrong\u003eLeak-Free Sealing System\u003c\/strong\u003e\u003cbr\u003eUtilises a high-temperature Viton O-ring to ensure a reliable seal under extreme conditions.\u003c\/p\u003e\n\u003cp\u003e✅ \u003cstrong\u003eBuilt for High-Boost Applications\u003c\/strong\u003e\u003cbr\u003eDesigned to withstand the cylinder pressures and cooling system demands that commonly cause factory plugs to fail.\u003c\/p\u003e\n\u003cp\u003e✅ \u003cstrong\u003eCorrosion-Resistant Components\u003c\/strong\u003e\u003cbr\u003eSupplied with stainless steel hardware for maximum corrosion resistance and service life.\u003c\/p\u003e\n\u003cp\u003e✅ \u003cstrong\u003eAdded M8 threads for EPC solid heater lines (ETA August 2026)\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✅ Integrated pilot dimple to aid in installing sensors.\u003cbr\u003e\u003c\/strong\u003eWe added a pilot dimple for those wanting to use the rear plug for sensors or a coolant bypass. Simply drill and tap to accomodate any threads you need.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eWhat's Included?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eBillet Leak-Free Rear Welsh (Freeze) Plug\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHigh-Temperature Viton O-Ring\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eStainless Steel Fastening Hardware\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003cp\u003eWhether you're building a competition truck, tow rig, or reliable street-driven Cummins, the EPC Leak-Free Rear Welsh Plug provides peace of mind where it matters most.\u003c\/p\u003e\n\u003ch3\u003eLeak-Free for Life.\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eRecommended product page callout:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e⚠️ \u003cstrong\u003eThis listing is for the REAR Welsh (Freeze) Plug only. One plug is required per engine.\u003c\/strong\u003e\u003c\/p\u003e\n\u003c!----\u003e","brand":"Engineering Performance Concepts","offers":[{"title":"blue","offer_id":67294152196141,"sku":"BRWPBU","price":69.99,"currency_code":"USD","in_stock":true},{"title":"black","offer_id":67294152228909,"sku":"BRWPBK","price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0771\/2459\/9853\/files\/WhatsApp_Image_2026-05-22_at_9.57.34_AM.jpg?v=1786334934"}],"url":"https:\/\/epcna.com\/collections\/4bt-parts.oembed","provider":"EPC LLC USA","version":"1.0","type":"link"}