{"product_id":"katech-gen-iv-ls3-416ci-boosted-short-block","title":"Katech Gen IV LS3 416ci Boosted Short Block","description":"\u003ch2\u003eKatech Gen IV LS3 416ci Boosted Short Block\u003c\/h2\u003e \u003cp\u003e\u003cstrong\u003e\u003cem\u003eNew GM LS3 Block and Forged Rotating Assembly for Supercharged and Turbocharged Engine Builds.\u003c\/em\u003e\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003eThe Katech Gen IV LS3 416ci Boosted Short Block combines a brand-new production GM LS3 block with a Callies forged crankshaft, Callies forged connecting rods, and CP-Carrillo forged pistons. Assembled by Katech's engine builders, this short block provides the foundation for a compatible boosted LS engine combination.\u003c\/p\u003e \u003cp\u003eA 4.070-inch bore and 4.000-inch crankshaft stroke provide approximately 416 cubic inches of displacement. The block is CNC clearanced to accommodate the stroker rotating assembly.\u003c\/p\u003e \u003cp\u003eThe specified compression ratio is 10.0:1 with a stock LS3 combustion chamber. Final compression ratio depends on chamber volume, head gasket dimensions, and piston deck clearance in the completed engine.\u003c\/p\u003e \u003chr\u003e \u003ch3\u003eFeatures \u0026amp; Benefits\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eBrand-New Production GM LS3 Engine Block\u003c\/li\u003e \u003cli\u003eApproximately 416 Cubic Inches of Displacement\u003c\/li\u003e \u003cli\u003eBlock CNC Clearanced for the Stroker Rotating Assembly\u003c\/li\u003e \u003cli\u003eCallies 8CW Forged Crankshaft with a 4.000-Inch Stroke\u003c\/li\u003e \u003cli\u003e58x Crankshaft Reluctor\u003c\/li\u003e \u003cli\u003eCallies Compstar XD Forged Connecting Rods\u003c\/li\u003e \u003cli\u003eCP-Carrillo Forged Pistons with Rings and Pins\u003c\/li\u003e \u003cli\u003e4.070-Inch Cylinder Bore\u003c\/li\u003e \u003cli\u003eSpecified 10.0:1 Compression Ratio with a Stock LS3 Combustion Chamber\u003c\/li\u003e \u003cli\u003eClevite Bearings\u003c\/li\u003e \u003cli\u003eBlock Oil and Coolant Plugs Included\u003c\/li\u003e \u003cli\u003eCrankshaft and Connecting Rod Upgrades Available\u003c\/li\u003e \u003cli\u003eHand-Assembled by Katech Master Engine Builders in Clinton Township, Michigan, USA\u003c\/li\u003e \u003c\/ul\u003e \u003chr\u003e \u003ch3\u003eTechnical Specifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eEngine Platform:\u003c\/strong\u003e GM Gen IV LS3\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e Approximately 416ci\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBlock:\u003c\/strong\u003e New Production GM LS3 Block\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBlock Preparation:\u003c\/strong\u003e CNC Stroker Clearancing\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBore:\u003c\/strong\u003e 4.070 Inches\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eStroke:\u003c\/strong\u003e 4.000 Inches\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCrankshaft:\u003c\/strong\u003e Callies 8CW Forged\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCrankshaft Reluctor:\u003c\/strong\u003e 58x\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eConnecting Rods:\u003c\/strong\u003e Callies Compstar XD Forged\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePistons:\u003c\/strong\u003e CP-Carrillo Forged\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRings and Pins:\u003c\/strong\u003e Included\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBearings:\u003c\/strong\u003e Clevite\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSpecified Compression Ratio:\u003c\/strong\u003e 10.0:1 with a Stock LS3 Combustion Chamber\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIntended Application:\u003c\/strong\u003e Boosted Engine Builds\u003c\/li\u003e \u003c\/ul\u003e \u003chr\u003e \u003ch3\u003eWhat's Included\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eNew GM LS3 Block with CNC Stroker Clearancing\u003c\/li\u003e \u003cli\u003eCallies 8CW Forged Crankshaft with 58x Reluctor\u003c\/li\u003e \u003cli\u003eCallies Compstar XD Forged Connecting Rods\u003c\/li\u003e \u003cli\u003eCP-Carrillo Forged Pistons, Rings, and Pins\u003c\/li\u003e \u003cli\u003eClevite Bearings\u003c\/li\u003e \u003cli\u003eBlock Oil and Coolant Plugs\u003c\/li\u003e \u003cli\u003eKatech Short Block Assembly\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eSold Separately:\u003c\/strong\u003e Valley cover and rear cover.\u003c\/p\u003e \u003cp\u003eThis listing is for an assembled short block. Additional components are required to complete a running engine.\u003c\/p\u003e \u003chr\u003e \u003ch3\u003eApplication \u0026amp; Fitment\u003c\/h3\u003e \u003cp\u003eThe Katech Gen IV LS3 416ci Boosted Short Block is intended for compatible LS-based supercharged and turbocharged builds. Vehicle fitment depends on the complete engine configuration and installation components.\u003c\/p\u003e \u003cul\u003e \u003cli\u003eCompatible Gen IV LS3-Based Boosted Engine Builds\u003c\/li\u003e \u003cli\u003eSupercharged LS Performance Applications\u003c\/li\u003e \u003cli\u003eTurbocharged LS Performance Applications\u003c\/li\u003e \u003cli\u003eCustom LS Installations with Compatible Supporting Components\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eVerify cylinder head, camshaft, oiling system, induction system, and engine management compatibility before completing the build. The 58x crankshaft reluctor must be matched to the selected electronics and control system.\u003c\/p\u003e \u003chr\u003e \u003ch3\u003eAvailable Upgrades \u0026amp; Installation\u003c\/h3\u003e \u003cp\u003eCrankshaft and connecting rod upgrades are available for the Katech Gen IV LS3 416ci Boosted Short Block. Select the final configuration around your intended power level, boost, fuel type, and operating range.\u003c\/p\u003e \u003cp\u003eInstall the short block as part of your own engine project or discuss installation services with Katech.\u003c\/p\u003e \u003chr\u003e \u003ch3\u003eImportant Build Notes\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eVerify Final Compression Ratio with the Selected Cylinder Heads, Head Gaskets, and Piston Deck Clearance\u003c\/li\u003e \u003cli\u003eCheck Piston-to-Valve Clearance with the Selected Camshaft and Cylinder Heads\u003c\/li\u003e \u003cli\u003eMatch the Fuel System and Calibration to the Completed Engine Combination\u003c\/li\u003e \u003cli\u003eSelect an Appropriate Oil Pump, Oil Pan, and Cooling System\u003c\/li\u003e \u003cli\u003eConfirm 58x Crankshaft Reluctor Compatibility with the Engine Management System\u003c\/li\u003e \u003cli\u003eFollow the Applicable Assembly, Startup, and Break-In Procedures\u003c\/li\u003e \u003c\/ul\u003e \u003chr\u003e \u003ch3\u003eWhy Choose Katech\u003c\/h3\u003e \u003cp\u003ePreparing an LS3 for increased displacement and boost requires a coordinated approach to block preparation, rotating assembly selection, and engine assembly. The Katech Gen IV LS3 416ci Boosted Short Block brings those elements together with a new GM block, forged components, and assembly by Katech's engine builders.\u003c\/p\u003e \u003cp\u003eKatech's engine development experience dates to 1977. Our team can help plan the supporting components and available upgrades around your performance goals.\u003c\/p\u003e \u003chr\u003e \u003cp\u003eFor configuration, upgrade, and installation questions, contact .\u003c\/p\u003e \u003cp\u003e\u003cimg src=\"..\/files\/prop-65-warning.jpg\" alt=\"Prop 65 Warning\"\u003e\u003c\/p\u003e","brand":"Katech","offers":[{"title":"Default Title","offer_id":47875086909596,"sku":"416CILSB","price":12074.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0473\/3206\/5436\/files\/M198642508.png?v=1791736824","url":"https:\/\/daroracing.com\/products\/katech-gen-iv-ls3-416ci-boosted-short-block","provider":"Daro Racing","version":"1.0","type":"link"}