{"product_id":"kpy-m11-x-2-00-thread-chaser-for-ls-engines-replacement-for-9120011-hardened-steel","title":"KPY M11 x 2.00 Thread Chaser for LS Engines – Replacement for 9120011, Hardened Steel","description":"\u003cp\u003e\u003cstrong\u003eKPY's M11 x 2.00 thread cleaning chaser is a hardened-steel replacement for OEM 9120011 \/ 912-0011 designed to clean and restore LS engine head-bolt threads for smooth, secure installation.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWhen you’re rebuilding or maintaining an LS-series engine, bolt threads in aluminum heads and blocks can collect corrosion, debris, or suffer minor damage that leads to cross-threading or stripped bolts. This thread chaser matches the M11 x 2.00 specification used on many GM LS engines (4.8L, 5.3L, 6.0L, 6.2L and other LS-based applications) and is made from hardened steel to withstand repeated use in professional and home garages alike. It’s intended for cleaning and restoring existing threads rather than cutting new ones, helping you get fasteners to seat properly without replacing expensive components.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this chaser help during an LS cylinder head install?\u003c\/h3\u003e\n\u003cp\u003eUsing the correct-size chaser ensures head bolts run true into their holes, reducing the chance of cross-threading and uneven torque. It cleans away corrosion and trapped debris so bolts can engage the original thread profile.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePrepares bolt holes for accurate torque readings\u003c\/li\u003e\n  \u003cli\u003eRemoves rust and aluminum filings that block thread engagement\u003c\/li\u003e\n  \u003cli\u003eHelps avoid stripping expensive head or block threads\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs this a direct replacement for OEM part 9120011 \/ 912-0011?\u003c\/h3\u003e\n\u003cp\u003eYes — the KPY tool is manufactured to the M11 x 2.00 profile and engineered to perform the same cleaning and restoration tasks as the listed OEM part numbers. It’s a like-for-like sizing match suitable for GM LS head bolt applications.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMatches OEM thread pitch and diameter: M11 x 2.00\u003c\/li\u003e\n  \u003cli\u003eIntended as a drop-in replacement for 9120011 \/ 912-0011\u003c\/li\u003e\n  \u003cli\u003eWorks with common LS head and block materials, including aluminum\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and durability can I expect from this thread chaser?\u003c\/h3\u003e\n\u003cp\u003eThe chaser is made from hardened steel to resist wear and maintain its cutting profile through multiple uses. Because it’s a chaser (thread cleaner) rather than a full-form tap, it removes contamination and restores damaged thread surfaces without aggressive re-cutting.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHardened steel construction for extended life\u003c\/li\u003e\n  \u003cli\u003eDesigned for repeated use in shop environments\u003c\/li\u003e\n  \u003cli\u003eAppropriate for cleaning soft aluminum block threads without excessive material removal\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I use this thread chaser safely and effectively?\u003c\/h3\u003e\n\u003cp\u003eUse light pressure, turn the chaser in and out to clear chips, and back off frequently to remove debris. Lubricate with appropriate cutting or light oil and avoid forcing the tool if resistance indicates a more serious thread issue.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eApply light oil or thread lubricant before use\u003c\/li\u003e\n  \u003cli\u003eTurn in slowly and reverse to evacuate shavings\u003c\/li\u003e\n  \u003cli\u003eReplace with a full tap only if threads are severely damaged\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? Professional mechanics, engine builders, and experienced DIYers working on GM LS engines who need a reliable M11 x 2.00 thread-cleaning tool will benefit from KPY’s hardened-steel chaser. It’s ideal for engine rebuilds, head swaps, and routine maintenance where preserving original threads is critical. If you service aluminum blocks or want to prevent time-consuming thread problems during reassembly, this chaser is a practical, cost-effective addition to your toolbox.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this chaser damage aluminum threads?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No, when used correctly it cleans and restores aluminum threads without excessive cutting; use light oil and gentle pressure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is this compatible with GM LS head bolts?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, it matches M11 x 2.00 sizing used on many GM LS engines and replaces OEM 9120011 \/ 912-0011.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"KPY","offers":[{"title":"Default Title","offer_id":55169161199959,"sku":"B0F4CZ86C6","price":73.04,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/kpy-front-view-thread-chaser.jpg?v=1790419794","url":"https:\/\/britishgarage.co.uk\/products\/kpy-m11-x-2-00-thread-chaser-for-ls-engines-replacement-for-9120011-hardened-steel","provider":"British Garage","version":"1.0","type":"link"}