{"product_id":"katech-gen-iv-lsa-416ci-naturally-aspirated-short-block-58x","title":"Katech Gen IV LSA 416ci Naturally Aspirated Short Block | 58x","description":"\u003ch2\u003eKatech Gen IV LSA 416ci Naturally Aspirated Short Block | 58x\u003c\/h2\u003e \u003cp\u003e\u003cstrong\u003e\u003cem\u003eProduction LSA Block and Forged Stroker Assembly, Hand-Assembled by Katech Master Engine Builders.\u003c\/em\u003e\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003eThe Katech Gen IV LSA 416ci Naturally Aspirated Short Block | 58x combines a brand-new production GM LSA 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 an LSA-block foundation for a compatible naturally aspirated performance engine.\u003c\/p\u003e \u003cp\u003eThe block is CNC clearanced for the stroker rotating assembly. A 4.070-inch bore and 4.000-inch crankshaft stroke provide approximately 416 cubic inches of displacement, with a 58x crankshaft reluctor for compatible engine management systems.\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 LSA 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 Crankshaft Reluctor Configuration\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 Block Platform:\u003c\/strong\u003e GM Gen IV LSA\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 LSA 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\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 LSA Block with CNC Stroker Clearancing\u003c\/li\u003e \u003cli\u003eCallies Forged Crankshaft with 58x Reluctor\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 LSA 416ci Naturally Aspirated Short Block | 58x is configured for naturally aspirated LS-based performance builds using a production LSA block. The LSA block designation does not mean this package includes a supercharger or is configured as a complete factory LSA engine.\u003c\/p\u003e \u003cul\u003e \u003cli\u003eCompatible Naturally Aspirated LS-Based Engine Builds\u003c\/li\u003e \u003cli\u003eCustom Performance Engine Installations Using an LSA Block\u003c\/li\u003e \u003cli\u003eApplications with Compatible 58x Engine Management\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eVehicle fitment depends on the selected cylinder heads, intake manifold, camshaft, oiling system, electronics, and installation components. Verify the complete combination before ordering.\u003c\/p\u003e \u003chr\u003e \u003ch3\u003eConfiguration \u0026amp; Installation\u003c\/h3\u003e \u003cp\u003eThis version uses a 58x crankshaft reluctor. Match the crankshaft and camshaft position signals to the selected engine management system.\u003c\/p\u003e \u003cp\u003ePlan cylinder head chamber volume, camshaft selection, fuel requirements, and calibration around the completed engine's compression ratio and intended use. Install 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 Supporting Oiling Components\u003c\/li\u003e \u003cli\u003eVerify Vehicle-Specific Mounting, Accessory, and Cooling System Requirements\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\u003eThe Katech Gen IV LSA 416ci Naturally Aspirated Short Block | 58x offers an LSA-block alternative for builders planning a naturally aspirated stroker combination. It brings together a new production block, forged rotating components, and CNC stroker clearancing with hand assembly by Katech Master Engine Builders.\u003c\/p\u003e \u003cp\u003eKatech can help coordinate the short block with the cylinder heads, camshaft, induction, and electronics needed for your performance goals.\u003c\/p\u003e \u003chr\u003e \u003cp\u003eFor engine 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":47875125182620,"sku":"KAT-A7000-58-LSA","price":9974.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0473\/3206\/5436\/files\/M198643268.png?v=1791737000","url":"https:\/\/daroracing.com\/products\/katech-gen-iv-lsa-416ci-naturally-aspirated-short-block-58x","provider":"Daro Racing","version":"1.0","type":"link"}