{"product_id":"atomic-barra-heavy-duty-timing-chain-kits","title":"Atomic Barra Heavy Duty Timing Chain Kits","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"atomic-section\"\u003e\n\u003cdiv class=\"atomic-grid\"\u003e\n\u003cdiv\u003e\n\u003ch2\u003eThe Problem\u003c\/h2\u003e\n\u003cp\u003eThe factory Barra timing system was never designed for high RPM, big cams, or heavy valve springs. Under load, stock chains stretch, plastic guides shatter, and standard crank sprockets wear out. The result?\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eCatastrophic engine failure.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cstrong\u003e💡 DID YOU KNOW?\u003c\/strong\u003e\n\u003cp\u003eJust upgrading valve springs alone will add\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e~40% increase in load\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eon the timing chain compared to standard. More aggressive, higher lift cams add more yet again. The effect is amplified at higher RPM.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2\u003eThe Atomic Solution\u003c\/h2\u003e\n\u003cp\u003eA fully engineered, race-proven timing solution. We don't just replace parts; we upgrade the entire architecture. From our\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eunbreakable billet guides\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eto our heavy-duty chains (nearly 2x factory strength), this kit is built to survive everything from a stock rebuild to a 2500hp monster without sacrificing NVH or reliability.\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eThe Genuine Factory Ford tensioners are used exclusively in our kits\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eas they have proven to be the most reliable and durable option available currently. \u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0587\/5548\/1713\/files\/fe8d053b-b98d-4909-a700-f0230a004d3f_dab39723-5189-4e12-a315-307d1ad7004f.png?v=1759884258\" alt=\"\" width=\"378\" height=\"473\"\u003e\u003cbr\u003e\n\u003cdiv class=\"img-caption\"\u003eThe complete solution: Chain, Billet Guides, Sprockets, and Tensioner.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"atomic-section\"\u003e\n\u003cdiv class=\"atomic-grid\"\u003e\n\u003cdiv\u003e\n\u003cimg height=\"291\" width=\"437\" alt=\"Atomic Barra Heavy Duty Timing Chain Kit | Core Kit + Sprocket\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0587\/5548\/1713\/files\/Atomic_Barra_Heavy_Duty_Timing_Chain_Kit_Core_Kit_Sprocket_2.jpg?v=1757497214\"\u003e\u003cbr\u003e\n\u003cdiv class=\"img-caption\"\u003eHeat-treated, case-hardened billet steel. Unbreakable.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch2\u003e2. The \"Unbreakable\" Guide\u003c\/h2\u003e\n\u003cp\u003eThe factory timing chain guide on the tensioner side is made from cast iron and fits loosely on the pivot bolt compared to modern performance engines. We solved it by manufacturing our own tight tolerance guide from\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eBillet Steel\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cul class=\"atomic-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eReprofiled Tip:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eWe redesigned the tip geometry to prevent the common plastic failure found in other designs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat Treated:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eCase-hardened for extreme durability and wear resistance against the tensioner piston\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh clearance \u003c\/strong\u003efrom specially chamfered shoulder to avoid contact with timing cover and guide breakage \u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChromoly Pivot:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIncludes a Billet Chromoly pivot bolt with a nyloc nut to ensure it never backs out under vibration. The play between the factory pivot and guide has been significantly reduced to avoid misalignment and unwanted guide movement\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"atomic-section\"\u003e\n\u003cdiv class=\"atomic-grid\"\u003e\n\u003cdiv\u003e\n\u003ch2\u003e3. HD Chain \u0026amp; Billet Sprocket\u003c\/h2\u003e\n\u003cp\u003eStrength where it counts. Our components are refined to handle the stress of high-lift cams and stiff valve springs.\u003c\/p\u003e\n\u003cul class=\"atomic-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy Duty Chain:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eApproximately\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e2x the strength\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eof the factory chain\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBillet Crank Sprocket:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eCase-hardened heat-treated steel with tighter manufacturing tolerances to reduce vibration and wear from play and misalignment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Polish Chain Links:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe smoothest, high quality finish chains we've been able to find. This means less noise, less wear, less vibration through the whole system and engine.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cimg height=\"304\" width=\"408\" alt=\"Atomic Barra Billet Crank Sprocket\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0587\/5548\/1713\/files\/Atomic_Barra_Billet_Crank_Sprocket_1.jpg?v=1757503091\"\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cimg height=\"287\" width=\"431\" alt=\"Atomic Barra Heavy Duty Timing Chain – Ford Barra DOHC vs stock\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0587\/5548\/1713\/files\/Atomic_Barra_Heavy_Duty_Timing_Chain_Ford_Barra_DOHC_vs_Stock.jpg?v=1760571675\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0587\/5548\/1713\/files\/Atomic_Barra_Heavy_Duty_Timing_Chain_Ford_Barra_DOHC_vs_Stock.jpg?v=1760571675\" alt=\"Atomic Barra Heavy Duty Timing Chain – Ford Barra DOHC vs stock\"\u003e\u003c\/p\u003e\n\u003cdiv class=\"atomic-section\"\u003e\n\u003ch2\u003eChoose Your Configuration\u003c\/h2\u003e\n\u003cdiv class=\"atomic-card-grid\"\u003e\n\u003cdiv class=\"atomic-card\"\u003e\n\u003ch3\u003eBasic Kit (-B)\u003c\/h3\u003e\n\u003cp\u003e\u003cem\u003eThe Essentials Upgrade.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003cul class=\"atomic-list\"\u003e\n\u003cli\u003eBillet Curved Guide\u003c\/li\u003e\n\u003cli\u003eHD Timing Chain\u003c\/li\u003e\n\u003cli\u003eBillet Chromoly Pivot Bolt\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"atomic-card\"\u003e\n\u003ch3\u003eComplete Kit (-C)\u003c\/h3\u003e\n\u003cp\u003e\u003cem\u003eThe Total Solution (Most Popular).\u003c\/em\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003cul class=\"atomic-list\"\u003e\n\u003cli\u003eEverything in Basic Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlus:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eBillet Crank Sprocket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlus:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGenuine OEM Ford Tensioner\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlus:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eAll Guides, Bolts, Seals \u0026amp; Gaskets\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"atomic-card\"\u003e\n\u003ch3\u003eCore Kit (-P)\u003c\/h3\u003e\n\u003cp\u003e\u003cem\u003eFor builders with their own sprocket\/tensioner.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003cul class=\"atomic-list\"\u003e\n\u003cli\u003eHD Timing Chain\u003c\/li\u003e\n\u003cli\u003eAll Guides (Curved, Top, Straight)\u003c\/li\u003e\n\u003cli\u003eBillet Pivot Bolt\u003c\/li\u003e\n\u003cli\u003eMounting Bolts\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"atomic-section\"\u003e\n\u003ch3\u003eTech Specs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eFord Barra DOHC 4.0L 6-Cyl (BA, BF, FG, FGX)\u003cbr\u003e\u003cstrong\u003ePower Rating:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eStock to 1500HP+\u003cbr\u003e\u003cstrong\u003eChain Type:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eHeavy Duty (Double Strength)\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e*Includes detailed installation instructions for DIY or professional use.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"atomic-section\"\u003e\n\u003ch3\u003e⚠️ Important Notes\u003c\/h3\u003e\n\u003cul class=\"atomic-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Gasket Thickness:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThis kit is designed for head gaskets up to\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1.2mm thick\u003c\/strong\u003e. Using thicker gaskets may over-tension the chain or affect tensioner operation. Contact Atomic for questions or concerns. 1.8mm gaskets are known to make installation and good operation very difficult due to chain tightness.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eCorrect timing is critical. Failure to follow the included instructions can lead to severe engine damage. \u003cstrong\u003eDO NOT MANUALLY ADD TENSION TO THE GUIDE!\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTiming cover clearance \u003c\/strong\u003eis a known issue on these engines. You must \u003cstrong\u003eUSE DOWELS ON THE TIMING COVER \u003c\/strong\u003eas per factory assembly. Without dowels your timing chain guide will likely hit the cover and snap. It is still possible for the guide to contact the cover even with the dowels as every casting is slightly different. We \u003cstrong\u003erecommend using blutac to confirm guide to cover clearance or at least 2mm. \u003c\/strong\u003eCheck clearance immediately after installing the tensioner, before the engine is run and the tensioner extends due to oil pressure. \u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBreak-In:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eUpon first start, it may take a few minutes for the hydraulic tensioner to fully take up slack. To speed up the process, bring engine RPM slowly to 4000rpm 2 or 3 times. Like 3 big breathes - 5s RPM up, 5s RPM down x3.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFailures are VERY rare on these parts\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eand manufacturing defects are lower than 1 in 1000 on the sprocket, pivot, guide and chain we produce. More often than not, harsh tunes, aggressive limiters, drivetrain problems like high line pressure, harsh shifts, clunky diffs, etc. introduce problems into the system that breaks parts. If you have a parts failure immediately after installation it is likely an installation error or manufacturing defect. Contact Atomic. If the failure occurs after installing other powertrain or engine management upgrades, then they have likely caused additional stress beyond these components' designed operating range. We cannot warranty our products against operation outside of healthy functioning engines or engines with reasonably expected issues. \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"atomic","offers":[{"title":"B | Basic | Billet Guide + Pivot + Chain","offer_id":42998855893081,"sku":"306620-K-C","price":899.0,"currency_code":"AUD","in_stock":false},{"title":"| -P | Core | Guides Chain Bolts","offer_id":42998855925849,"sku":"SKU: 306620-K-P","price":569.0,"currency_code":"AUD","in_stock":true},{"title":"| -S | Core + Sprocket | No Tensioner","offer_id":42998855958617,"sku":"306620-K-S","price":699.0,"currency_code":"AUD","in_stock":true},{"title":"| -T | Core + Tensioner | No Sprocket","offer_id":42998855991385,"sku":"306620-K-T","price":749.0,"currency_code":"AUD","in_stock":true},{"title":"| -C | Complete | Everything!","offer_id":42998856024153,"sku":"306620-K-T","price":899.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2132\/8457\/files\/Atomic_Barra_Heavy_Duty_Timing_Chain_Kit_Core_Kit_Sprocket_1500x_13efb35c-0c6d-44a8-b33e-dbf59c017bfe.jpg?v=1768869297","url":"https:\/\/www.bfis.com.au\/products\/atomic-barra-heavy-duty-timing-chain-kits","provider":"Brisbane Fuel Injection Services","version":"1.0","type":"link"}