{"product_id":"489ci-chevy-base-engine","title":"489CI Chevy Base Engine","description":"The ATK High Performance HP411P is a Chevy 489CI base engine engineered to deliver significant power, boasting 565 horsepower and 595 lb-ft of torque. It is built upon a seasoned OE 4-bolt main Gen V block, compatible with 1991-1995 models, and accommodates bores up to 4.310” and strokes up to 4.250” for its substantial 489 cubic inch displacement.\n\nInternally, the engine features a robust assembly including a Scat nodular iron crankshaft with a 4.250” stroke, internally balanced for smooth operation. Forged Scat 4340 I-beam connecting rods are secured with ARP 8740 bolts, paired with forged pistons that achieve a 10.1:1 compression ratio. A hydraulic roller camshaft with .635in\/.640ex lift and 237\/243 duration at 50 degrees, along with a double-roller timing chain, ensures precise valve timing.\n\nComplementing the core engine components are ATK HP aluminum cylinder heads featuring 112cc combustion chambers and 290cc intake runners, equipped with 2.250” intake and 1.880” exhaust valves. Billet aluminum 1.7 roller rocker arms are standard, and the engine comes with a Moroso 6-quart street\/strip oil pan with a windage tray, offering a total capacity of 7 quarts with the filter. A Melling high-volume oil pump is also included.\n\nATK recommends specific components for optimal performance, including an internal balancer, a Pioneer internal balance 168-tooth flexplate\/flywheel, an Edelbrock Performer RPM intake manifold, and an HEI distributor. A Quick Fuel 770 CFM carburetor with electric choke is suggested, and the engine requires an electric fuel pump as it lacks mechanical provisions. For operation, this engine requires premium fuel (91+ Octane), a minimum stall converter of 2800 RPM, and 2-inch headers.","brand":"ATK High Performance","offers":[{"title":"Default Title","offer_id":52687001157944,"sku":"HP411P","price":8635.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/661660419.jpg?v=1784879329","url":"https:\/\/store.motormia.co\/products\/489ci-chevy-base-engine","provider":"MOTORMIA","version":"1.0","type":"link"}