{"product_id":"katech-gen-iv-ls3-416ci-naturally-aspirated-short-block","title":"Katech Gen IV LS3 416ci Naturally Aspirated Short Block","description":"\u003ch2\u003eKatech Gen IV LS3 416ci Naturally Aspirated Short Block\u003c\/h2\u003e \u003cp\u003e\u003cstrong\u003e\u003cem\u003eForged 416ci Stroker Assembly, Hand-Assembled by Katech Master Engine Builders.\u003c\/em\u003e\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003eThe Katech Gen IV LS3 416ci Naturally Aspirated Short Block combines a brand-new production GM LS3 block with a Callies forged crankshaft, Callies forged connecting rods, and CP-Carrillo forged pistons. Hand-assembled by Katech Master Engine Builders in Clinton Township, Michigan, USA, it provides the foundation for a compatible naturally aspirated LS performance engine.\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 10.9:1 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 Forged Crankshaft with a 4.000-Inch Stroke\u003c\/li\u003e \u003cli\u003e58x or 24x Crankshaft Reluctor Configuration Available\u003c\/li\u003e \u003cli\u003eCallies 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 10.9:1 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\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 Forged\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCrankshaft Reluctor:\u003c\/strong\u003e 58x or 24x, Depending on Selected Configuration\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eConnecting Rods:\u003c\/strong\u003e Callies 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 10.9:1 with a Stock LS3 Combustion Chamber\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIntended Application:\u003c\/strong\u003e Naturally Aspirated 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 Forged Crankshaft in the Selected 58x or 24x Configuration\u003c\/li\u003e \u003cli\u003eCallies 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 Naturally Aspirated Short Block is intended for compatible LS-based engine builds using naturally aspirated induction. Installation depends on the selected cylinder heads, camshaft, intake manifold, oiling system, electronics, and vehicle components.\u003c\/p\u003e \u003cul\u003e \u003cli\u003eCompatible LS3-Based Naturally Aspirated Performance Builds\u003c\/li\u003e \u003cli\u003eCustom LS Engine Installations with Compatible Supporting Systems\u003c\/li\u003e \u003cli\u003eApplications Using the Appropriate 58x or 24x Engine Management Configuration\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eSelect the crankshaft reluctor configuration to match the intended control system. A 24x or 58x selection alone does not establish complete electronics compatibility; camshaft position sensing and other supporting components must also be matched.\u003c\/p\u003e \u003chr\u003e \u003ch3\u003eConfiguration \u0026amp; Installation\u003c\/h3\u003e \u003cp\u003eChoose the 58x or 24x crankshaft reluctor configuration appropriate for your build before ordering. Plan the cylinder heads, camshaft, induction system, and fuel requirements around the completed engine combination.\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\u003eConfirm Crankshaft and Camshaft Position Signal Compatibility with the Engine Management System\u003c\/li\u003e \u003cli\u003eMatch Fuel Selection, Fuel System Capacity, and Calibration to the Completed Engine\u003c\/li\u003e \u003cli\u003eSelect an Appropriate Oil Pump, Oil Pan, and Cooling 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\u003eA naturally aspirated stroker engine relies on a coordinated combination of displacement, compression, airflow, and camshaft selection. The Katech Gen IV LS3 416ci Naturally Aspirated Short Block establishes that foundation with a new GM block, forged rotating components, and assembly by Katech Master Engine Builders.\u003c\/p\u003e \u003cp\u003eThe available reluctor configurations allow the short block to be specified around the intended electronics, while Katech's engine development experience helps guide the supporting combination.\u003c\/p\u003e \u003chr\u003e \u003cp\u003eFor configuration 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":47875035955356,"sku":"KAT-A7000-58","price":10499.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0473\/3206\/5436\/files\/M198642022.png?v=1791736551","url":"https:\/\/daroracing.com\/products\/katech-gen-iv-ls3-416ci-naturally-aspirated-short-block","provider":"Daro Racing","version":"1.0","type":"link"}