{"product_id":"acl-4m2737h-025-main-bearing-set-nissan-vg30dett","title":"ACL Nissan VG30DETT 3.0L-V6 0.025 Oversized High Performance Main Bearing Set","description":"\u003ch4\u003ePrecision Clearance Control for High-Output VG30DETT Builds\u003c\/h4\u003e\u003cp\u003eEngineered as a direct replacement for the Nissan 300ZX Twin Turbo (VG30DETT), the 4M2737H-.025 from ACL is built to restore reliable performance without compromise. Every detail, from material selection to finish, is designed for a confident fit and long service life.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e4M2737H-.025: 0.025mm oversized bearing shells restore proper clearance on reconditioned VG30DETT crankshafts\u003c\/li\u003e\n\u003cli\u003eHigh-performance aluminum-tin alloy bearing material handles boosted horsepower and sustained load\u003c\/li\u003e\n\u003cli\u003eTri-metal construction improves fatigue strength over stock bearing shells\u003c\/li\u003e\n\u003cli\u003eEngineered specifically for the Nissan VG30DETT twin-turbo V6 bottom end\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecifications\u003c\/h4\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eACL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMPN\u003c\/td\u003e\n\u003ctd\u003e4M2737H-.025\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003eContact us for UPC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVehicle Fitment\u003c\/td\u003e\n\u003ctd\u003eNissan 300ZX Twin Turbo (VG30DETT)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch4\u003eWhat's Included\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e(1) ACL main bearing set, 0.025mm oversized\u003c\/li\u003e\n\u003cli\u003eUpper and lower bearing shells for all main journals\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eAbout ACL\u003c\/h4\u003e\u003cp\u003eACL has manufactured performance engine bearings for decades, supplying tri-metal and race-spec bearing sets trusted by engine builders working on high-output and forced-induction applications.\u003c\/p\u003e\u003ch4\u003eRelated Parts on Our Site\u003c\/h4\u003e\u003cul\u003e\u003cli\u003e\u003ca href=\"\/collections\/performance\"\u003eShop Performance Parts\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e\u003ch4\u003eFrequently Asked Questions\u003c\/h4\u003e\u003cstrong\u003eWhat is the 4M2737H-.025?\u003c\/strong\u003e\u003cp\u003eThe 4M2737H-.025 is an ACL 0.025mm oversized main bearing set engineered for the Nissan VG30DETT twin-turbo V6, used when the crankshaft has been machined 0.025mm undersize.\u003c\/p\u003e\u003cstrong\u003eWhen is a 0.025mm oversized bearing needed?\u003c\/strong\u003e\u003cp\u003eThis size is used after the crankshaft main journals have been machined 0.025mm undersize during a rebuild, typically to correct wear or damage.\u003c\/p\u003e\u003cstrong\u003eWhat material are these bearings made from?\u003c\/strong\u003e\u003cp\u003eThey use a high-performance aluminum-tin alloy in a tri-metal construction for improved fatigue strength. The 4M2737H-.025 is built to the same standard across every unit.\u003c\/p\u003e\u003cstrong\u003eAre these bearings suitable for forced-induction builds?\u003c\/strong\u003e\u003cp\u003eYes, they are designed to handle the increased loads found in turbocharged and high-output VG30DETT applications.\u003c\/p\u003e\u003cstrong\u003eDoes this set include both upper and lower bearing shells?\u003c\/strong\u003e\u003cp\u003eYes, the set includes shells for all main journal positions.\u003c\/p\u003e\u003cstrong\u003eDo I need to measure clearances after installation?\u003c\/strong\u003e\u003cp\u003eYes, checking bearing clearance with plastigauge or a micrometer during assembly is recommended engine-building practice.\u003c\/p\u003e\u003cstrong\u003eCan these be used with a stock crankshaft?\u003c\/strong\u003e\u003cp\u003eNo, this oversized set is intended for crankshafts that have been machined 0.025mm undersize; a standard-size set is needed for a stock crank.\u003c\/p\u003e\u003cstrong\u003eIs professional engine assembly required?\u003c\/strong\u003e\u003cp\u003eInstalling main bearings requires precision engine-building experience and is best performed by a qualified machine shop or engine builder.\u003c\/p\u003e\u003ch4\u003eInstall Instructions\u003c\/h4\u003e\u003col\u003e\n\u003cli\u003eRemove the crankshaft from the engine block following the manufacturer's service procedure.\u003c\/li\u003e\n\u003cli\u003eClean all bearing saddles and the crankshaft main journals thoroughly.\u003c\/li\u003e\n\u003cli\u003eMeasure journal diameters to confirm 0.025mm undersize machining has been completed correctly.\u003c\/li\u003e\n\u003cli\u003eInstall the upper bearing shells into the block saddles, aligning the locating tabs.\u003c\/li\u003e\n\u003cli\u003eLubricate the bearing surfaces with assembly lubricant.\u003c\/li\u003e\n\u003cli\u003eInstall the crankshaft, then install the lower bearing shells into the main caps.\u003c\/li\u003e\n\u003cli\u003eTorque main cap bolts to the manufacturer's specification in the proper sequence.\u003c\/li\u003e\n\u003cli\u003eVerify bearing clearance using plastigauge or a micrometer before final engine assembly. The 4M2737H-.025 is designed for a straightforward installation when following these steps.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch4\u003eProp 65 Warning\u003c\/h4\u003e\u003cp\u003eWARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.\u003c\/p\u003e","brand":"ACL","offers":[{"title":"Default Title","offer_id":46336925827151,"sku":"ACL4M2737H-.025","price":109.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/acl-4m2737h-025-main-bearing-set-nissan-vg30dett.png?v=1785603117","url":"https:\/\/www.blackopsautoworks.com\/products\/acl-4m2737h-025-main-bearing-set-nissan-vg30dett","provider":"Black Ops Auto Works","version":"1.0","type":"link"}