{"title":"Cummins","description":null,"products":[{"product_id":"d-828","title":"1989-98 5.9L 12 Valve Cummins Rocker Arm Adjusting Screw H-13 (D-828)","description":"\u003cp\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eManton 12v Cummins Adjusting Screw\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e12 needed per set.\u003c\/strong\u003e Fits 1989-1998 5.9L 12V Cummins\u003c\/p\u003e\u003cp\u003e Enhance your 1989-1998 5.9L 12V Cummins with Nitrided Billet Tool Steel Adjusting Screws. These screws are made from H-13 tool steel, heat treated, triple tempered, and nitrided for durability. Manufactured with rolled threads and broached for Allen wrench compatibility. Custom screws available with oil holes or oil grooves upon request. Stock rocker arm setup uses part number D-828 with stock length, thread pitch, and ball radius. Proper installation crucial; deviations affect rocker arm ratio and valve lift. Pre-lubricate with high zinc assembly oil to prevent galling during initial start-up. Pair with lightweight 12-point poly lock jam nuts for optimal performance. 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Stock 3\/8 diameter pushrods, nearly 11.5 inches long, lack sufficient strength beyond standard use. OEM pushrods can’t handle excessive stress from increased valve train loads. Choose from our 3\/8 and 7\/16 diameter 3-piece pushrods for improved column strength and stability.\u003c\/p\u003e\u003cp\u003eOur pushrods feature 4130\/4135 seamless Chromoly tubing with various heat treatments and billet steel tip ends. CNC machined from 86L20 bar stock, tips are core hardened and triple tempered for durability, enhancing overall valve train performance. Engineered to fit the largest diameter pushrod possible, we prevent binding with cylinder head ports by using 7\/16 diameter tubing. This design doubles loading capacity before deflection, making it ideal for Cummins engines.\u003c\/p\u003e\u003cp\u003eUpgrade to our Series 5 pushrods for competition engines, offering 105,000 p.s.i. additional tensile strength over Series 3. This ensures precise valve timing and reduces valve train surging. Proven in top fuel, sprint cars, and marine champions, Series 5 pushrods are the strongest chromoly option available.\u003c\/p\u003e\u003cp\u003eFor custom engine modifications, use our pushrod length checking tools to maintain stock rocker geometry and valve bridge contact. Incorrect adjustments can affect valve lift and performance. 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With stock ratio and pushrod bearing surface replacing your warn out rocker arms is a breeze. Unlike the stock rocker arms, the Manton rocker arms feature a serviceable rocker arm body with replaceable bushings and adjusting screw. Upgrade your warn out system today with a Manton rocker arm. Manton tool steel Intake roller rocker arm for use with OEM style cylinder heads. Features a Manton Part# 826 tool steel adjusting screws with a much needed upgrade of force feed oil from the rocker shaft directly into the pushrod cup. 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Choose from our 3\/8 and 7\/16 diameter 3-piece pushrods for improved column strength and stability.\u003c\/p\u003e\u003cp\u003eCrafted from 4130\/4135 seamless Chromoly tubing, our pushrods offer various heat-treating options and come standard with billet steel tip ends. CNC machined from 86L20 bar stock, the tips are core hardened and triple tempered for durability, enhancing overall valve train performance. Our engineering versatility ensures compatibility with your specific engine combination.\u003c\/p\u003e\u003cp\u003eWe engineer pushrods to fit the largest possible diameter without causing binding with cylinder head ports. The 7\/16 diameter tubing provides nearly double the loading capacity before deflection, making it ideal for Cummins engines. Opt for our Series 5 pushrods in competition engines for improved strength and performance.\u003c\/p\u003e\u003cp\u003eSeries 5 pushrods offer 105,000 p.s.i. additional tensile strength over Series 3, enhancing valve timing accuracy and reducing surging. Proven durable in top fuel, sprint cars, and marine champions year after year. 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This drop-in package offers 105 lbs. of seat pressure and 165 lbs. of open pressure at 0.420 lift, crucial for vehicles with upgraded performance cams. Engineered with Manton's exclusive \"Pressure Tower\" conical spring design and \"Ultra Light\" steel retainers, this kit ensures the highest strength-to-weight ratio and unmatched reliability across any application, whether your truck serves daily commutes or competitive racing. The springs are optimized for up to 75 PSI boost, backed by 105 lbs. of seat pressure. Manton provides heat-treated spring shims to adjust seat pressure as needed for different boost levels. For older trucks from 1998.5 to 2002, where valve spring pockets may be too tight, Manton offers a valve spring pocket cutter to enlarge the pocket for a perfect fit with this advanced spring kit. \u003cstrong\u003eImportant Note:\u003c\/strong\u003e Some 1998.5-2002 Cummins trucks may require valve spring pocket adjustments to fit conical springs properly. Manton provides a pocket cutter for this purpose. Upgrade your Cummins today with Manton's superior valve spring and retainer kit, crafted to meet the demands of high-performance engines with precision and reliability.\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e","brand":"Manton Diesel","offers":[{"title":"Default Title","offer_id":67809858355399,"sku":"D-105-KIT-24v","price":523.86,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0789\/1953\/2743\/files\/1787267002254-197377955.jpg?v=1790952165"},{"product_id":"d-105-24v-e","title":"1998-17 5.9L \u0026 6.7L - 24 Valve Cummins Straight Valve Spring Economy Kit (Valve Springs Only)","description":"\u003cp\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eManton 24v Cummins Straight Valve Spring\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e24v Cummins Common Rail 5.9-6.7 High Boost Replacement Springs (use with factory retainers and locks) Designed for up to 80 PSI of Boost, if exceeding this please call for us to supply proper valve springs accessories to adjust seat pressure for your max boost.\u003c\/p\u003e\u003cp\u003eSpecs:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\u003cp\u003e110 LBS @ 1.340 Seat Pressure\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e192LBS @ .920 Open Pressure @ .420 Valve Lift\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003eMax Valve Lift Accommodation of .500\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e","brand":"Manton Diesel","offers":[{"title":"Default Title","offer_id":67809858814151,"sku":"D-105-24v-E","price":299.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0789\/1953\/2743\/files\/1787335434510-641823187.jpg?v=1790952168"},{"product_id":"d-304-hydv2-24v-12","title":"2025 to Current 6.7L 24v Cummins with Hydraulic Lifter- Series 3 Pushrod, 3\/8 x .095 Wall Factory Length - 1 Set of 12","description":"\u003cp\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eManton 24v Cummins Hydraulic Pushrods Series 3\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eUpgrade your 24v Cummins Pushrods for enhanced strength and valve train stability. Stock 3\/8 diameter pushrods are insufficient beyond stock applications due to their 11.5-inch length. OEM pushrods can’t handle excess stress on the valve train, leading to reduced performance.\u003c\/p\u003e\u003cp\u003eChoose from our 3\/8 and 7\/16 diameter 3-piece pushrods, crafted from 4130\/4135 seamless Chromoly tubing with various heat treatments. Each features billet steel tip ends CNC machined from 86L20 bar stock, offering superior impact and wear resistance. These enhancements extend pushrod life and improve overall valve train performance.\u003c\/p\u003e\u003cp\u003eWe engineer pushrods to fit the largest diameter possible without binding with the cylinder head port. Upgrading from 3\/8 to 7\/16 diameter tubing doubles loading capacity, ideal for Cummins engines. 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With stock ratio and pushrod bearing surface replacing your warn out rocker arms is a breeze. Unlike the stock rocker arms, the Manton rocker arms feature a serviceable rocker arm body with replaceable bushings and adjusting screw. Upgrade your warn out system today with a Manton rocker arm.\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e","brand":"Manton Diesel","offers":[{"title":"Default Title","offer_id":67809859076295,"sku":"D-131-24v","price":444.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0789\/1953\/2743\/files\/1790978101608-568508291.jpg?v=1790978135"},{"product_id":"d-851","title":"1989-17 12 \u0026 24 Valve Cummins Rocker Arm Jam Nut\n3\/8-24 x .620 O.D. 12 pt. 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Stock 3\/8 diameter pushrods, nearly 11 inches long, lack sufficient strength beyond stock use. OEM pushrods can’t handle excessive stress from increased valve train loads. Choose from our 3\/8 and 7\/16 diameter 3-piece pushrods for improved column strength and stability.\u003c\/p\u003e\u003cp\u003eCrafted from 4130\/4135 seamless Chromoly tubing, our pushrods offer various heat-treating options and come standard with billet steel tip ends. CNC machined from 86L20 bar stock, the tips are core hardened and triple tempered for durability, enhancing overall valve train performance. Our engineering versatility ensures compatibility with your specific engine combination.\u003c\/p\u003e\u003cp\u003eWe engineer pushrods to fit the largest possible diameter without causing binding with cylinder head ports. The 7\/16 diameter tubing provides nearly double the loading capacity before deflection, making it ideal for Cummins engines. 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We've applied our top-tier standards from Top Fuel and Blown Alcohol Fat Head Hemi systems. Rocker arm bodies feature polished bronze bushings machined from our proprietary grade toolsteel. Specially selected toolsteel with unique heat treatment enhances durability and performance. Includes aerospace-grade toolsteel roller and pin for high load capability. Comes complete with Toolsteel Adjusting Screws, Corrected Oiling Trunnion Bearings, and Billet Valve Bridges. Features 12-point Jam Nuts and upgraded Rocker Arm Retention Bolts for enhanced reliability. 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