The Tool Desk
Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →BluePrint rates its GM LS-compatible 427-cubic-inch Builder Series crate-engine package at 830 horsepower and 800 lb-ft of torque. It is a supercharged package featuring a Magnuson TVS2650 and Holley Terminator X Max EFI—not a naturally aspirated engine—and those output figures are manufacturer claims, not independently verified test results in the sources reviewed.
Before choosing one, check the transmission package, vehicle fitment, and use restrictions: BluePrint says it is not for pollution-controlled vehicles or dry-sump applications. Its listing specifies 91+ octane fuel and warns that running the Holley setup wizard erases the ECU’s preloaded calibration.
BluePrint 427 Builder Series specifications
| Specification | Manufacturer-listed detail |
|---|---|
| Displacement and compatibility | 427 cubic inches; GM LS-compatible package |
| Rated output | 830 horsepower and 800 lb-ft of torque, as claimed by BluePrint |
| Supercharger | Magnuson TVS2650 |
| EFI | Holley Terminator X Max, with ECU and harness system |
| Compression ratio | 9.5:1 |
| Fuel recommendation | 91+ octane |
| Listed construction | High-strength cast-iron block, forged crankshaft, and forged pistons |
| Use restrictions | Not for pollution-controlled vehicles or dry-sump applications |
BluePrint’s product listing provides these specifications and restrictions. Race Engine Technology also reported the introduced engine’s stated 830 bhp and 800 lb-ft output. Neither source establishes an independent test result or explains the dyno procedure for this exact model. [BluePrint Engines; Race Engine Technology]
Transmission packages and price snapshots
BluePrint listings show versions paired with a T56 manual transmission and a 4L80E automatic transmission. Indexed prices were $32,999 for the T56 package and $35,799 for the 4L80E package; these are snapshots, not guaranteed current prices. Confirm price, stock, exact configuration, and package contents with BluePrint before buying.
Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errors#1 Best Overall
- Required for setup: Integrated wizard in included TCM handheld tuner, used with Terminator X 3.5-inch Handheld
- Shift Mode & Torque Management supported
- Four loose wires for connection:
- Power (Red) - Connect to battery or constant power source (5 amps)
- Ground (Black) - Connect to good chassis/engine ground source
| Package | Indexed price snapshot | Source |
|---|---|---|
| T56 manual transmission | $32,999 | BluePrint listing |
| 4L80E automatic transmission | $35,799 | BluePrint listing |
The listings do not establish a complete side-by-side comparison of every package variation. Check transmission choice, pulley or accessory configuration, and included components against the exact listing for the package you plan to order. [T56 black-pulley listing]
Fitment and installation cautions
BluePrint says the retrofit oil pan fits most 1955–1995 GM front-engine, rear-wheel-drive V8 cars. “Most” is not a guarantee of fit: verify the specific vehicle and installation requirements with the manufacturer. The listing also excludes pollution-controlled vehicles and dry-sump applications, so do not assume the package is generally street-legal or suitable for those setups.
Rank #2
- Manufacturer Part Number: 558-443
- This was the perfect add on and with a can bus splitter I never disconnect any of the screens just plug and play
- This cable can be used with Holley EFI, Sniper EFI, and Terminator X Tuning Software.
- The cables are sealed against dirty environments. These connector cables are designed to fit select Holley EFI systems.
- Confirm your vehicle’s fitment and intended use with BluePrint, including the oil-pan and dry-sump restrictions.
- Choose the correct transmission package and confirm its current price, availability, and exact contents.
- Plan for the listed 91+ octane fuel recommendation.
- Preserve the supplied EFI calibration: BluePrint warns that running the Holley setup wizard erases its preloaded calibration.
These are manufacturer-listed specifications and cautions, not a substitute for checking the current product documentation for your exact package. [BluePrint Engines]
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.FAQ
How much horsepower does the BluePrint 427 Builder Series make?
BluePrint rates the 427 Builder Series package at 830 horsepower and 800 lb-ft of torque. These are manufacturer claims; the sources reviewed do not provide independent testing or the dyno procedure for this model.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
Rank #3
- Full Color, Backlit 3.5” Touch Screen LCD
- Laptop-Free Tuning changes to help optimize mileage, driveability and performance
- Basic Tuning options allow simple adjustments of Basic Fuel, Fuel Learn, Basic Idle, Spark, and More!
- System Tuning options allow modifications to Outputs, Engine Setup, Ignition Setup
- Advanced Tuning options allow fine tuning of Fuel, Closed Loop, Learn, and Idle (including IAC parameters and Idle Spark)
Is the BluePrint 427 naturally aspirated?
No. The listed package includes a Magnuson TVS2650 supercharger and Holley Terminator X Max EFI.
What transmission comes with the 830-horsepower BluePrint 427?
BluePrint listings show packages with either a T56 manual or a 4L80E automatic transmission. Check the exact listing for current price and package details.
Rank #4
- Bolt on 2x4 4150 Flange Carburetor Replacement
- Supports up to 1500 HP Naturally Aspirated or 1250 HP Forced Induction with Eight 100 Lb/Hr Injectors
- Internal 1bar MAP sensor, built into the Terminator X ECU
- External fuel pressure regulator required, set to a base pressure of 58.5 PSI, such as Holley part # 12-886
- Integrated ignition timing control
What fuel does BluePrint recommend?
The product listing specifies 91+ octane fuel.
Will it fit my car, and can I use it in a pollution-controlled vehicle?
BluePrint says the retrofit oil pan fits most 1955–1995 GM front-engine, rear-wheel-drive V8 cars, but you should confirm your specific fitment. The manufacturer says the package is not for pollution-controlled vehicles or dry-sump applications.
Can I run the Holley setup wizard during installation?
BluePrint warns that the supplied ECU is already loaded with its calibration and that running the Holley setup wizard erases it. Follow the current manufacturer instructions for the exact package.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
