{"product_id":"katech-gen-iv-ls7-street-attack-short-block","title":"Katech Gen IV LS7 Street Attack Short Block","description":"\u003ch2\u003eKatech Gen IV LS7 Street Attack Short Block\u003c\/h2\u003e \u003cp\u003e\u003cstrong\u003e\u003cem\u003eNew GM LS7 Block with Forged Components, Hand-Assembled by Katech Master Engine Builders.\u003c\/em\u003e\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003eThe Katech Gen IV LS7 Street Attack Short Block combines a brand-new production GM LS7 block with a Callies forged crankshaft, Callies forged connecting rods, and CP forged pistons. Hand-assembled by Katech Master Engine Builders in Clinton Township, Michigan, USA, it provides the foundation for a compatible naturally aspirated LS7 performance engine.\u003c\/p\u003e \u003cp\u003eThe rotating assembly features a 4.000-inch-stroke crankshaft with a 58x reluctor and 4.125-inch pistons. Clevite main and rod bearings and block oil and coolant plugs are included.\u003c\/p\u003e \u003cp\u003eThe specified compression ratio is 11.2:1 with a stock LS7 combustion chamber. Higher compression ratios are available upon request. Final compression ratio depends on the selected chamber volume, head gasket dimensions, and piston deck clearance.\u003c\/p\u003e \u003cp\u003eFor completed engine builds targeting 750+ HP, confirm the required cylinder heads, camshaft, induction, exhaust, fuel, and operating range with Katech. Output depends on the complete engine combination and calibration.\u003c\/p\u003e \u003chr\u003e \u003ch3\u003eFeatures \u0026amp; Benefits\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eBrand-New Production GM LS7 Engine Block\u003c\/li\u003e \u003cli\u003eDesigned for Naturally Aspirated LS7 Performance Builds\u003c\/li\u003e \u003cli\u003eCallies Forged Crankshaft with a 4.000-Inch Stroke\u003c\/li\u003e \u003cli\u003e58x Crankshaft Reluctor\u003c\/li\u003e \u003cli\u003eCallies Forged Connecting Rods\u003c\/li\u003e \u003cli\u003eCP Forged 4.125-Inch Pistons with Rings and Pins\u003c\/li\u003e \u003cli\u003eSpecified 11.2:1 Compression Ratio with a Stock LS7 Combustion Chamber\u003c\/li\u003e \u003cli\u003eClevite Main and Rod Bearings\u003c\/li\u003e \u003cli\u003eBlock Oil and Coolant Plugs Included\u003c\/li\u003e \u003cli\u003eHigher Compression Ratios Available upon Request\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 LS7\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBlock:\u003c\/strong\u003e New Production GM LS7 Block\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePiston Diameter:\u003c\/strong\u003e 4.125 Inches\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCrankshaft Stroke:\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 Forged\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRings and Pins:\u003c\/strong\u003e Included\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMain and Rod Bearings:\u003c\/strong\u003e Clevite\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSpecified Compression Ratio:\u003c\/strong\u003e 11.2:1 with a Stock LS7 Combustion Chamber\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCompression Options:\u003c\/strong\u003e Higher Ratios Available upon Request\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 Production GM LS7 Block\u003c\/li\u003e \u003cli\u003eCallies Forged Crankshaft with 58x Reluctor\u003c\/li\u003e \u003cli\u003eCallies Forged Connecting Rods\u003c\/li\u003e \u003cli\u003eCP Forged Pistons, Rings, and Pins\u003c\/li\u003e \u003cli\u003eClevite Main and Rod 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 LS7 Street Attack Short Block is intended for compatible naturally aspirated LS7-based engine builds. Vehicle installation depends on the completed engine configuration, oiling system, electronics, and installation components.\u003c\/p\u003e \u003cul\u003e \u003cli\u003eCompatible LS7-Based Naturally Aspirated Performance Builds\u003c\/li\u003e \u003cli\u003eCustom LS Installations with Compatible Supporting Systems\u003c\/li\u003e \u003cli\u003eEngine Combinations Using Compatible 58x Engine Management\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eVerify cylinder head, camshaft, oiling system, and engine management compatibility before completing the build.\u003c\/p\u003e \u003chr\u003e \u003ch3\u003eCompression Ratio Options\u003c\/h3\u003e \u003cp\u003eHigher compression ratios are available upon request. Select the compression ratio around the intended fuel, camshaft, cylinder heads, and operating conditions. Changes to chamber volume, head gasket thickness, or piston deck clearance affect the final ratio.\u003c\/p\u003e \u003chr\u003e \u003ch3\u003eImportant Build Notes\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eVerify Final Compression Ratio for the Completed Engine Combination\u003c\/li\u003e \u003cli\u003eCheck Piston-to-Valve Clearance with the Selected Camshaft and Cylinder Heads\u003c\/li\u003e \u003cli\u003eMatch Fuel Selection and Calibration to the Compression Ratio and Intended Use\u003c\/li\u003e \u003cli\u003eConfirm Crankshaft and Camshaft Position Signal Compatibility with the Engine Management System\u003c\/li\u003e \u003cli\u003eSelect an Appropriate Oil Pump, Oil Pan, and Supporting Oiling Components\u003c\/li\u003e \u003cli\u003eMatch the Cooling System and Fuel System to the Completed Engine's 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 LS7 platform offers a foundation for naturally aspirated performance, but the finished result depends on how the engine's components work together. The Katech Gen IV LS7 Street Attack Short Block combines a new GM block and forged rotating components with hand assembly by Katech Master Engine Builders.\u003c\/p\u003e \u003cp\u003eAvailable compression options allow the build to be planned around its fuel and performance goals, while Katech's LS7 development experience helps guide the supporting combination.\u003c\/p\u003e \u003chr\u003e \u003cp\u003eFor compression options and complete engine configuration 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":47875100573852,"sku":"KAT-LS7SB","price":12914.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0473\/3206\/5436\/files\/M198642633.jpg?v=1791736872","url":"https:\/\/daroracing.com\/products\/katech-gen-iv-ls7-street-attack-short-block","provider":"Daro Racing","version":"1.0","type":"link"}