{"product_id":"rcm-subaru-ej-line-bore-engineering-process","title":"RCM Subaru EJ# Line bore Engineering Process","description":"\u003ch2 data-start=\"163\" data-end=\"209\"\u003eSubaru EJ# Line bore Engineering Process\u003c\/h2\u003e\n\u003cp data-start=\"211\" data-end=\"575\"\u003eAt RCM Engineering, precision is at the heart of everything we do. Our Subaru EJ-series line bore process has been developed and refined over decades of building and maintaining championship-winning engines. Whether it’s a factory EJ20, EJ22, or EJ25, achieving perfect main bearing alignment is critical for reliability, performance, and oil system efficiency.\u003c\/p\u003e\n\u003ch3 data-start=\"577\" data-end=\"604\"\u003eWhat is Line boring?\u003c\/h3\u003e\n\u003cp data-start=\"606\" data-end=\"939\"\u003eLine boring is the process of machining the main bearing tunnel to ensure absolute alignment across all bearing housings. Over time—or through excessive stress, heat, or improper assembly—the main tunnel can distort. Even a fraction of a millimetre in misalignment can cause bearing wear, increased friction, and reduced oil pressure.\u003c\/p\u003e\n\u003ch3 data-start=\"941\" data-end=\"970\"\u003eOur Precision Process\u003c\/h3\u003e\n\u003cp data-start=\"972\" data-end=\"1055\"\u003eAt RCM, every EJ block undergoes a meticulous inspection before machining begins.\u003c\/p\u003e\n\u003col data-start=\"1056\" data-end=\"1692\"\u003e\n\u003cli data-start=\"1056\" data-end=\"1208\"\u003e\n\u003cp data-start=\"1059\" data-end=\"1208\"\u003eBlock Preparation: Each case half is ultrasonically cleaned, assembled, and torqued to factory specification using our precision torque plates.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1209\" data-end=\"1404\"\u003e\n\u003cp data-start=\"1212\" data-end=\"1404\"\u003eMeasurement and Assessment: Using advanced digital bore gauges and coordinate measuring equipment, we map the existing alignment to identify any deviation from Subaru’s factory geometry.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1405\" data-end=\"1550\"\u003e\n\u003cp data-start=\"1408\" data-end=\"1550\"\u003eMachining: The block is then line bored or line-honed using our in-house CNC equipment, achieving tolerance levels down to a few microns.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1551\" data-end=\"1692\"\u003e\n\u003cp data-start=\"1554\" data-end=\"1692\"\u003eFinal Validation: After machining, all measurements are rechecked, ensuring perfect concentricity, bearing crush, and oil clearance.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3 data-start=\"1694\" data-end=\"1716\"\u003eWhy It Matters\u003c\/h3\u003e\n\u003cp data-start=\"1718\" data-end=\"1759\"\u003eA properly line bored EJ block delivers:\u003c\/p\u003e\n\u003cul data-start=\"1760\" data-end=\"1991\"\u003e\n\u003cli data-start=\"1760\" data-end=\"1816\"\u003e\n\u003cp data-start=\"1762\" data-end=\"1816\"\u003eImproved bearing life and oil pressure stability\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1817\" data-end=\"1877\"\u003e\n\u003cp data-start=\"1819\" data-end=\"1877\"\u003eReduced friction and wear under high-load conditions\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1878\" data-end=\"1925\"\u003e\n\u003cp data-start=\"1880\" data-end=\"1925\"\u003eEnhanced crankshaft rotation smoothness\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1926\" data-end=\"1991\"\u003e\n\u003cp data-start=\"1928\" data-end=\"1991\"\u003eOptimised reliability for both road and race applications\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"1993\" data-end=\"2044\"\u003eBuilt for Performance, Proven in Motorsport\u003c\/h3\u003e\n\u003cp data-start=\"2046\" data-end=\"2263\"\u003eEvery RCM-engineered line bore process reflects our motorsport heritage. From Time Attack Championship winning engines to bespoke high-performance road builds, our methods ensure each engine performs flawlessly at every RPM.\u003c\/p\u003e\n\u003cp data-start=\"2265\" data-end=\"2405\"\u003eIf you’re rebuilding or upgrading your Subaru EJ engine, RCM’s precision line bore service guarantees the foundation your build deserves.\u003c\/p\u003e","brand":"RCM","offers":[{"title":"Default Title","offer_id":45680544284833,"sku":"SEN2196","price":1385.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/9738\/5377\/files\/Engine_Block-3_6c130ee9-fd54-4b1b-8126-a722192c4686.jpg?v=1769725946","url":"https:\/\/www.gotitrex.com.au\/products\/rcm-subaru-ej-line-bore-engineering-process","provider":"Gotitrex","version":"1.0","type":"link"}