{"product_id":"blueprint-engines-427-ls-pro-series-crate-engine-efi-605hp-psls4273ctf","title":"BluePrint Engines 427CI GM LS Pro Series Crate Engine, Base Dressed EFI — 605 HP \/ 565 lb-ft | Holley Terminator X, Forged | PSLS4273CTF","description":"\u003cp\u003eThis is a BluePrint Engines 427 cubic inch GM LS Pro Series crate engine, base dressed with a Holley Terminator X Max EFI system, rated at 605 horsepower and 565 lb-ft of torque. It is built on a high-strength LSX-style cast iron block with a forged rotating assembly and LS3-style aluminum heads, and arrives with the GM plastic intake, throttle body, fuel injectors, and the Terminator X ECU and harness. Every BluePrint crate engine is dyno tested and ships with a dyno printout.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDisplacement: 427 c.i.\u003c\/li\u003e\n\u003cli\u003eHorsepower: 605 HP\u003c\/li\u003e\n\u003cli\u003eTorque: 565 lb-ft\u003c\/li\u003e\n\u003cli\u003eBore: 4.0685 in\u003c\/li\u003e\n\u003cli\u003eStroke: 4.125 in\u003c\/li\u003e\n\u003cli\u003eCompression ratio: 11:1\u003c\/li\u003e\n\u003cli\u003eBlock: High-strength cast iron LSX-style, 6-bolt main, priority main oiling, uses OEM LS3 front and rear covers, 1-piece rear main seal\u003c\/li\u003e\n\u003cli\u003eCrankshaft: Forged, 4.125 in stroke\u003c\/li\u003e\n\u003cli\u003eConnecting rods: Forged 6.125 in\u003c\/li\u003e\n\u003cli\u003ePistons: Forged, dish, 22cc\u003c\/li\u003e\n\u003cli\u003eCylinder heads: BluePrint LS3-style aluminum PS8015, 69cc chamber, 2.165 in intake \/ 1.590 in exhaust valves, 259cc intake runners\u003c\/li\u003e\n\u003cli\u003eCamshaft: Hydraulic roller, 3-bolt, .624 in intake \/ .624 in exhaust lift, 239\/255 duration at .050, 114 deg LSA\u003c\/li\u003e\n\u003cli\u003eInduction: GM plastic intake, drive-by-wire throttle body, EV6-type injectors (42 lb at 58 psi), Holley Terminator X Max EFI with pre-loaded calibration\u003c\/li\u003e\n\u003cli\u003eBalance: Internally balanced\u003c\/li\u003e\n\u003cli\u003eFuel: 91+ octane\u003c\/li\u003e\n\u003cli\u003ePart number: PSLS4273CTF\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eWhat's Included:\u003c\/strong\u003e Base dressed EFI engine with the Holley Terminator X Max ECU and harness (pre-loaded with a BluePrint calibration), GM plastic intake manifold, drive-by-wire throttle body, fuel injectors and fuel rail, throttle pedal and sensors, coil packs, spark plugs and wires, harmonic balancer, water pump, and an LS-swap oil pan with windage tray and pickup. A non-weighted flex plate or flywheel is required.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eEngine Platform:\u003c\/strong\u003e Built to the GM LS platform, Pro Series. The included LS-swap oil pan fits most 1955 to 1995 GM front-engine rear-wheel-drive V8 chassis. Do not run the Holley setup wizard, which erases the BluePrint calibration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCompliance:\u003c\/strong\u003e Not for use on pollution-controlled vehicles, and not for dry-sump applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eProp 65 Warning:\u003c\/strong\u003e This product can expose you to chemicals known to the State of California to cause cancer and reproductive harm. For more information visit www.P65Warnings.ca.gov.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch5\u003eDoes the 427 LS come with EFI?\u003c\/h5\u003e\u003cp\u003eYes. It is base dressed with a Holley Terminator X Max EFI system, including the ECU and harness pre-loaded with a BluePrint calibration, GM plastic intake, throttle body, injectors, and fuel rail.\u003c\/p\u003e\u003ch5\u003eHow much power does it make?\u003c\/h5\u003e\u003cp\u003eIt is rated at 605 horsepower and 565 lb-ft of torque, and ships with a dyno printout.\u003c\/p\u003e\u003ch5\u003eWhat chassis does the oil pan fit?\u003c\/h5\u003e\u003cp\u003eThe included LS-swap oil pan fits most 1955 to 1995 GM front-engine rear-wheel-drive V8 cars. It is not for dry-sump setups.\u003c\/p\u003e\u003ch5\u003eDo I need a special flywheel or flex plate?\u003c\/h5\u003e\u003cp\u003eYes. A non-weighted (balancer-less) flex plate or flywheel is required for this internally balanced LS engine.\u003c\/p\u003e\u003ch5\u003eIs it street legal?\u003c\/h5\u003e\u003cp\u003eBluePrint states this Pro Series engine is not for use on pollution-controlled vehicles. Confirm your local requirements before purchase.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Does the 427 LS come with EFI?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. It is base dressed with a Holley Terminator X Max EFI system, including the ECU and harness pre-loaded with a BluePrint calibration, GM plastic intake, throttle body, injectors, and fuel rail.\"}}, {\"@type\": \"Question\", \"name\": \"How much power does it make?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"It is rated at 605 horsepower and 565 lb-ft of torque, and ships with a dyno printout.\"}}, {\"@type\": \"Question\", \"name\": \"What chassis does the oil pan fit?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The included LS-swap oil pan fits most 1955 to 1995 GM front-engine rear-wheel-drive V8 cars. It is not for dry-sump setups.\"}}, {\"@type\": \"Question\", \"name\": \"Do I need a special flywheel or flex plate?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. A non-weighted (balancer-less) flex plate or flywheel is required for this internally balanced LS engine.\"}}, {\"@type\": \"Question\", \"name\": \"Is it street legal?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"BluePrint states this Pro Series engine is not for use on pollution-controlled vehicles. Confirm your local requirements before purchase.\"}}]}\u003c\/script\u003e","brand":"BluePrint Engines","offers":[{"title":"Default Title","offer_id":42425083199536,"sku":"FMKG_PSLS4273CTF","price":16099.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/BPEPSLS4273CTF.jpg?v=1758664967","url":"https:\/\/berryperformancesales.com\/products\/blueprint-engines-427-ls-pro-series-crate-engine-efi-605hp-psls4273ctf","provider":"Berry Performance Sales","version":"1.0","type":"link"}