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The "LS" nomenclature originally came from the [[Regular Production Option]] (RPO) code LS1, assigned to the first engine in the Gen III engine series. The LS nickname has since been used to refer generally to all Gen III and IV engines,<ref>{{Cite web |last=Garbe |first=Eric |date=2022-01-21 |title=A Guide to LS Cylinder Heads |url=http://www.enginebuildermag.com/2022/01/a-guide-to-ls-cylinder-heads/ |access-date=2023-03-20 |website=Engine Builder Magazine |language=en-US |archive-date=March 20, 2023 |archive-url=https://web.archive.org/web/20230320224245/https://www.enginebuildermag.com/2022/01/a-guide-to-ls-cylinder-heads/ |url-status=live }}</ref> but that practice can be misleading, since not all engine RPO codes in those generations begin with LS.<ref>{{Cite web |last=Garbe |first=Eric |date=2022-01-21 |title=A Guide to LS Cylinder Heads |url=http://www.enginebuildermag.com/2022/01/a-guide-to-ls-cylinder-heads/ |access-date=2023-03-18 |website=Engine Builder Magazine |language=en-US |archive-date=March 20, 2023 |archive-url=https://web.archive.org/web/20230320224245/https://www.enginebuildermag.com/2022/01/a-guide-to-ls-cylinder-heads/ |url-status=live }}</ref> Likewise, although Gen V engines are generally referred to as "LT" small-blocks after the RPO LT1 first version, GM also used other two-letter RPO codes in the Gen V series.<ref>{{Cite web |title=Everything You Want To Know About The GM Gen V / LT Engine |url=https://www.holley.com/blog/post/everything_you_want_to_know_about_the_gm_gen_v_lt_engine/ |access-date=2023-03-18 |work=[[Holley Performance Products]] |language=en |archive-date=September 24, 2024 |archive-url=https://web.archive.org/web/20240924064328/https://www.holley.com/blog/post/everything_you_want_to_know_about_the_gm_gen_v_lt_engine/ |url-status=live }}</ref><ref>{{Cite web |last=Panait |first=Mircea |date=2021-08-28 |title=General Motors LT Small-Block V8 Engine Guide |url=https://www.autoevolution.com/news/general-motors-lt-small-block-v8-engine-guide-168253.html |access-date=2023-03-19 |website=autoevolution |language=en}}</ref>
The LS1 was first fitted in the [[Chevrolet Corvette (C5)]],<ref name="leg">{{Cite magazine|title=The Legendary Small-Block Chevy V-8: A Look Back at Its Highlights and Evolution|url=https://www.motortrend.com/how-to/small-block-chevy-engine-history/|access-date=2023-03-20|magazine=[[MotorTrend]]|language=en|date=February 27, 2023|first1=Steven|last1=Rupp|first2=Jason|last2=Udy|archive-date=March 24, 2023|archive-url=https://web.archive.org/web/20230324190900/https://www.motortrend.com/how-to/small-block-chevy-engine-history/|url-status=live}}</ref> and LS or LT engines have powered every generation of the Corvette since (with the exception of the Z06 variant of the [[Chevrolet Corvette (C8)|eighth generation Corvette]], which is powered by the unrelated [[Chevrolet Gemini small-block engine]]).<ref>{{Cite web |last=Sherman |first=Don |date=2022-02-21 |title=LT6 Breakdown: The Z06's 670-hp V-8 is a landmark achievement |url=https://www.hagerty.com/media/maintenance-and-tech/lt6-breakdown-the-z06s-670-hp-v-8-is-a-landmark-achievement/ |access-date=2023-03-19 |website=Hagerty Media |language=en-US |archive-date=March 21, 2023 |archive-url=https://web.archive.org/web/20230321051914/https://www.hagerty.com/media/maintenance-and-tech/lt6-breakdown-the-z06s-670-hp-v-8-is-a-landmark-achievement/ |url-status=live }}</ref> Various other General Motors automobiles have been powered by LS- and LT-based engines, including
A clean-sheet design, the only shared components between the Gen III engines and the first two generations of the [[Chevrolet small-block engine (first- and second-generation)|Chevrolet small-block engine]] are the [[connecting rod]] bearings and [[valve lifter]]s.<ref name=":3" /> However, the Gen III and Gen IV engines were designed with modularity in mind, and several engines of the two generations share a large number of interchangeable parts.<ref>{{Cite web |title=LS Gen III vs Gen IV Swap Guide |url=https://www.ictbillet.com/swap-guide/ls-swap-guide/ls-gen-iii-vs-gen-iv-swap-guide.html |access-date=2023-03-19 |website=www.ictbillet.com |archive-date=September 24, 2024 |archive-url=https://web.archive.org/web/20240924064327/https://www.ictbillet.com/swap-guide/ls-swap-guide/ls-gen-iii-vs-gen-iv-swap-guide.html |url-status=live }}</ref> Gen V engines do not share as much with the previous two, although the [[engine block]] is carried over, along with the connecting rods.<ref>{{Cite web |last=Smith |first=Jeff |date=December 14, 2020 |title=Everything You Want To Know About The GM Gen V / LT Engine |url=https://www.holley.com/blog/post/everything_you_want_to_know_about_the_gm_gen_v_lt_engine/ |access-date=2023-03-19 |work=[[Holley Performance Products]] |language=en |archive-date=September 24, 2024 |archive-url=https://web.archive.org/web/20240924064328/https://www.holley.com/blog/post/everything_you_want_to_know_about_the_gm_gen_v_lt_engine/ |url-status=live }}</ref> The serviceability and parts availability for various Gen III and Gen IV engines have made them a popular choice for [[engine swap]]s in the car enthusiast and [[hot rodding]] community; this is known colloquially as an [[LS swap]].<ref>{{Cite web |date=2014-03-26 |title=9 Popular Engine Swaps - Choose Wisely |url=https://www.motortrend.com/how-to/1404-popular-engine-swaps/ |access-date=2023-03-19 |website=MotorTrend |language=en}}</ref><ref>{{Cite web |last=Garbe |first=Eric |date=2021-08-12 |title=Popular Engine Swaps |url=https://www.enginebuildermag.com/2021/08/popular-engine-swaps/ |access-date=2023-03-19 |website=Engine Builder Magazine |language=en-US |archive-date=September 24, 2024 |archive-url=https://web.archive.org/web/20240924064328/https://www.enginebuildermag.com/2021/08/popular-engine-swaps/ |url-status=live }}</ref><ref name=hr>{{Cite web|title=Everything You Need to Know About LS, LSX, and Vortec Engines: Specs, History, Swaps, and More|url=https://www.hotrod.com/how-to/chevy-ls-lsx-lsa-engine-history/|access-date=2023-03-21|magazine=[[Hot Rod (magazine)|Hot Rod]]|first=Steven|last=Rupp|language=en|date=Jan 22, 2022|archive-date=January 19, 2025|archive-url=https://web.archive.org/web/20250119160822/https://www.hotrod.com/how-to/chevy-ls-lsx-lsa-engine-history/|url-status=live}}</ref> These engines also enjoy a high degree of aftermarket support due to their popularity and affordability.<ref>{{Cite web |title=Guide to LS engine swaps |url=https://www.whichcar.com.au/features/guide-to-ls-conversions |access-date=2023-03-19 |website=WhichCar |date=May 25, 2018 |language=en |first=Iain |last=Kelly |archive-date=June 22, 2021 |archive-url=https://web.archive.org/web/20210622205409/https://www.whichcar.com.au/features/guide-to-ls-conversions |url-status=live }}</ref>
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Another common problem with the 2001–2006 5.3L engines was cracking cylinder heads. This is commonly called the "Castech Head" failure. GM issued a [[Technical Service Bulletin]] on this failure to help service technicians identify the problem. The head casting number (which can be viewed from the passenger side of the vehicle just in front of the valve cover) was 706. Some heads with this casting number would fail (but not all of them) as GM had different suppliers for the same head. The failure was due to undetected porosity around the oil drains in the head.<ref>{{cite web |url=http://ww2.justanswer.com/uploads/Bluegorilla/2008-12-05_142924_Coolant_loss_5.3.pdf |title=Castech Head Failure TSB |access-date=January 25, 2012 |url-status=live |archive-url=https://web.archive.org/web/20120327175657/http://ww2.justanswer.com/uploads/Bluegorilla/2008-12-05_142924_Coolant_loss_5.3.pdf |archive-date=March 27, 2012 |df=mdy-all }}</ref>
Yet another common problem with the 2005–2016 fourth generation V8 LS engines was a failure of the specialized lifters in engines equipped with the AFM system. While in AFM operation, the lifters would sometimes fail to come out of AFM mode and cause the engine to go into 'limp home' mode. In this mode damage could occur to the pistons, camshaft, or the lifters themselves. The resulting solution was a package of components that would replace the lifters, lifter guides, camshaft, Valve Lifter Oil Manifold (VLOM) plate. Cylinder heads were required to be removed from the engine in order to replace all the components. The engine computer also required reprogramming to permanently Disable AFM.<ref>{{cite web|url=https://help.summitracing.com/app/answers/detail/a_id/4901/~/ls-engine-tech-%E2%80%93-active-fuel-management-%28afm%29|title=LS Engine Tech - Active Fuel Management, Overview of the Chevy AFM System|website=help.summitracing.com|archive-url=https://web.archive.org/web/20231011042914/https://help.summitracing.com/app/answers/detail/a_id/4901/~/ls-engine-tech-%E2%80%93-active-fuel-management-(afm)|archive-date=11 October 2023|url-status=dead}}</ref><ref>{{cite web | url=https://www.youtube.com/watch?v=GcuC2FxozE8 | title=Why and How to Disable GM's Active Fuel Management (AFM)! | website=[[YouTube]] | date=April 28, 2021 | access-date=September 12, 2023 | archive-date=October 11, 2023 | archive-url=https://web.archive.org/web/20231011042913/https://www.youtube.com/watch?v=GcuC2FxozE8 | url-status=live }}</ref><ref>{{cite web | url=https://www.youtube.com/watch?v=DNxBaSDD5q8 | title=SDPC Tech Tips: DOD/AFM Delete 101 | website=[[YouTube]] | date=March 11, 2019 | access-date=September 12, 2023 | archive-date=October 11, 2023 | archive-url=https://web.archive.org/web/20231011042912/https://www.youtube.com/watch?v=DNxBaSDD5q8 | url-status=live }}</ref><ref>{{cite web | url=https://gmauthority.com/blog/2023/02/17-plaintiffs-sent-to-arbitration-in-gm-v8-engine-valve-lifter-lawsuit/ | title=17 Plaintiffs Sent to Arbitration in GM Valve Lifter Lawsuit | date=February 24, 2023 | access-date=September 12, 2023 | archive-date=December 17, 2023 | archive-url=https://web.archive.org/web/20231217193911/https://gmauthority.com/blog/2023/02/17-plaintiffs-sent-to-arbitration-in-gm-v8-engine-valve-lifter-lawsuit/ | url-status=live }}</ref><ref>{{cite web | url=https://www.autocornerd.com/chevy-afm-problem-years/ | title=Chevy AFM Problem Years (Is It Serious?) - Autocornerd | date=July 4, 2022 | access-date=September 12, 2023 | archive-date=July 17, 2024 | archive-url=https://web.archive.org/web/20240717090456/https://www.autocornerd.com/chevy-afm-problem-years/ | url-status=live }}</ref><ref>{{cite web|url=https://www.melling.com/wp-content/uploads/2018/03/Melling-tech-bulletin-on-GM-LS-Deactivation-Lifter-Issues-3.1.18-1.pdf|title=Technical Bulletin - GM LS AFM Deactivation Lifter Issues|publisher=Melling Engine parts|website=www.melling.com|archive-url=https://web.archive.org/web/20240622163902/https://www.melling.com/wp-content/uploads/2018/03/Melling-tech-bulletin-on-GM-LS-Deactivation-Lifter-Issues-3.1.18-1.pdf|archive-date=22 June 2024|url-status=dead}}</ref><ref>{{cite web | url=https://www.classaction.org/gm-lifter-problems-lawsuit | title=GM Lifter Problems Could Lead to Class Action Lawsuit | date=October 14, 2021 | access-date=September 12, 2023 | archive-date=June 23, 2024 | archive-url=https://web.archive.org/web/20240623080748/https://www.classaction.org/gm-lifter-problems-lawsuit | url-status=live }}</ref><ref>{{cite web | url=https://considertheconsumer.com/consumer-class-actions/general-motors-faulty-afm-lifters-class-action-lawsuit-selling-cars-that-result-in-the-valve-train-defect | title=General Motors Faulty AFM Lifters Class Action Lawsuit: Valve Train Defect | work=Consider The Consumer | date=January 4, 2022 |archive-url=https://web.archive.org/web/20220104102943/https://considertheconsumer.com/consumer-class-actions/general-motors-faulty-afm-lifters-class-action-lawsuit-selling-cars-that-result-in-the-valve-train-defect|archive-date=Jan 4, 2022|url-status=dead}}</ref><ref>{{cite web | url=https://law.justia.com/cases/federal/district-courts/michigan/miedce/2:2021cv12927/358783/35/ | title=Harrison et al v. General Motors, LLC, No. 2:2021cv12927 - Document 35 (E.D. Mich. 2022) | access-date=September 12, 2023 | archive-date=June 21, 2024 | archive-url=https://web.archive.org/web/20240621114837/https://law.justia.com/cases/federal/district-courts/michigan/miedce/2:2021cv12927/358783/35/ | url-status=live }}</ref>
==Build-your-own program==
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