{"id":8607,"date":"2026-06-24T17:31:24","date_gmt":"2026-06-24T17:31:24","guid":{"rendered":"https:\/\/elevemotors.com\/product\/atk-engines-hp89c-gm-high-performance-350-long-block-crate-engine\/"},"modified":"2026-06-24T19:13:25","modified_gmt":"2026-06-24T19:13:25","slug":"atk-engines-hp89c-gm-high-performance-350-long-block-crate-engine","status":"publish","type":"product","link":"https:\/\/elevemotors.com\/it\/product\/atk-engines-hp89c-gm-high-performance-350-long-block-crate-engine\/","title":{"rendered":"ATK Engines HP89C GM High Performance 350 Long Block Crate Engine"},"content":{"rendered":"<p>Engine Specifications:\u2022 HP: 390\u2022 TQ: 420\u2022 Block: OE roller block 4 bolt main 1pc seal 1996-2000\u2022 Bore\/Stroke: 4.040\u201d x 3.480\u201d\u2022 Displacement: 350CI\u2022 Crankshaft: OE Reground external balance rear of the crank\/internal balance front of the crank\u2022 Rods: OE powder metal 5.7\u201d\u2022 Pistons: Hypereutectic 10:1 Compression\u2022 Rings: Moly\u2022 Camshaft: Hyd. Roller\u2022 Cam Specs: 220\/224 @50 .528in\/.536ex 110LSA\u2022 Timing Chain: Double Roller\u2022 Cylinder Heads: ATK High Performance aluminum with 2.020 in. \/1.600 ex. valves\u2022 Rocker Arms: Billet aluminum roller rockers 1.6 ratio\u2022 Oil Pan: Rear sump 5qt (not for Chevelles with steering behind crossmember, some corvettes and 62-67 chevy II\u2019s)\u2022 Oil Pump: Melling STD Volume\u2022 Flexplate\/Flywheel: Externally Balanced \u2013 Pioneer #FRA-159\u2022 Balancer: Internally Balanced \u2013 PowerBond #PB1046-N\u2022 Intake Manifold: ATK dual plane intake\u2022 Distributor: HEI (Iron Gear)\u2022 Water Pump: OE long pump\u2022 Carburetor: Quick Fuel 680CFM Vacuum secondary\u2019s electric choke #HR-680\u2022 Fuel Pump: Mechanical fuel pump\u2022 Spark Plugs: Autolite #3923\u2022 Spark Plug Wires: 8mm Engine Info:\u2022 Oil: Conventional \/ Non Synthetic 10W30\u2022 Oil Filter: Wix or K&amp;N\u2022 Timing: 34-36 Degrees\u2022 Spark Plug Gap: .035\u201d\u2022 Firing Order: 18436572\u2022 Octane: 91+\u2022 Stall Converter: 2200-2800\u2022 Exhaust: 1 5\/8 Headers Disclaimer: The parts listed are ATK\u2019s recommendations of parts to be used to obtain our power figures listed. Power figures can vary based on parts used by the end user. It is the customer\u2019s responsibility to verify components will work in their application. Some modifications to the vehicle may be required using these and or other aftermarket parts. ATK reserves the right to substitute parts used in engines if necessary.<\/p>\n<h3>Specifications<\/h3>\n<ul>\n<li><strong>Crate Engine Type:<\/strong> Long Block<\/li>\n<li><strong>Engine Displacement:<\/strong> 350 cu. in.<\/li>\n<li><strong>Horsepower:<\/strong> 390 horsepower<\/li>\n<li><strong>Compression Ratio:<\/strong> 10.1:1<\/li>\n<li><strong>Torque:<\/strong> 420 ft.\/lbs.<\/li>\n<li><strong>Camshaft Type:<\/strong> Hydraulic Roller<\/li>\n<li><strong>Cylinder Head Material:<\/strong> Aluminum<\/li>\n<li><strong>Piston Material:<\/strong> Hypereutectic Aluminum<\/li>\n<li><strong>Camshaft Duration (.050 in):<\/strong> 220\u00b0 intake \/ 224\u00b0 exhaust<\/li>\n<li><strong>Camshaft Lift (in):<\/strong> .528 intake \/ .536 exhaust<\/li>\n<li><strong>Bore x Stroke (in):<\/strong> 4.040&quot; x 3.480&quot;<\/li>\n<li><strong>Carburetor Included:<\/strong> Yes<\/li>\n<li><strong>Intake Manifold Included:<\/strong> Yes<\/li>\n<li><strong>Distributor Included:<\/strong> Yes<\/li>\n<li><strong>Connecting Rod Material:<\/strong> Powdered Metal<\/li>\n<li><strong>Valve Covers Included:<\/strong> Yes<\/li>\n<li><strong>Engine Balance:<\/strong> Internal<\/li>\n<li><strong>Cylinder Heads Included:<\/strong> Yes<\/li>\n<li><strong>Rear Main Seal Style:<\/strong> 1-piece<\/li>\n<li><strong>Throttle Body Included:<\/strong> No<\/li>\n<li><strong>Oil Pan Included:<\/strong> Yes<\/li>\n<li><strong>Timing Cover Included:<\/strong> Yes<\/li>\n<li><strong>Water Pump Included:<\/strong> Yes<\/li>\n<li><strong>Harmonic Balancer Included:<\/strong> Yes<\/li>\n<li><strong>Flexplate Included:<\/strong> Yes<\/li>\n<li><strong>Flywheel Included:<\/strong> No<\/li>\n<li><strong>Air Cleaner Included:<\/strong> No<\/li>\n<li><strong>Spark Plugs Included:<\/strong> Yes<\/li>\n<li><strong>Spark Plug Wires Included:<\/strong> Yes<\/li>\n<li><strong>Computer Included:<\/strong> No<\/li>\n<li><strong>Wiring Harness Included:<\/strong> No<\/li>\n<li><strong>Recommended Fuel:<\/strong> 91 Octane<\/li>\n<li><strong>Spark Plug Style:<\/strong> Stock<\/li>\n<li><strong>Brand:<\/strong> ATK Engines<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Engine Specifications:\u2022 HP: 390\u2022 TQ: 420\u2022 Block: OE roller block 4 bolt main 1pc seal 1996-2000\u2022 Bore\/Stroke: 4.040\u201d x 3.480\u201d\u2022 Displacement: 350CI\u2022 Crankshaft: OE Reground external balance rear of the crank\/internal balance front of the crank\u2022 Rods: OE powder metal 5.7\u201d\u2022 Pistons: Hypereutectic 10:1 Compression\u2022 Rings: Moly\u2022 Camshaft: Hyd. Roller\u2022 Cam Specs: 220\/224 @50 .528in\/.536ex [&#8230;]\n","protected":false},"featured_media":8226,"comment_status":"closed","ping_status":"open","template":"","meta":{"_joinchat":[]},"product_brand":[],"product_cat":[356],"product_tag":[],"class_list":["post-8607","product","type-product","status-publish","has-post-thumbnail","product_cat-crate-engines","first","instock","purchasable","product-type-simple"],"exclude_global_add_ons":[],"addons":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.4 (Yoast SEO v28.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>ATK Engines HP89C GM High Performance 350 Long Block Crate Engine<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/elevemotors.com\/it\/prodotto\/atk-engines-hp89c-gm-high-performance-350-long-block-crate-engine\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ATK Engines HP89C GM High Performance 350 Long Block Crate Engine\" \/>\n<meta property=\"og:description\" content=\"Engine Specifications:\u2022 HP: 390\u2022 TQ: 420\u2022 Block: OE roller block 4 bolt main 1pc seal 1996-2000\u2022 Bore\/Stroke: 4.040\u201d x 3.480\u201d\u2022 Displacement: 350CI\u2022 Crankshaft: OE Reground external balance rear of the crank\/internal balance front of the crank\u2022 Rods: OE powder metal 5.7\u201d\u2022 Pistons: Hypereutectic 10:1 Compression\u2022 Rings: Moly\u2022 Camshaft: Hyd. 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