Looking for a 400 small block crate engine that’s ready to install and deliver solid performance? This guide highlights top BluePrint Engines options that cater to different goals—high horsepower builds, street drivability, and classic Chevy swaps. The selections emphasize engines with strong reliability, clear compatibility, and straightforward installation. Best for hot-rodders seeking big torque, restorers aiming for period-correct power, and mixed-use enthusiasts who want a drop-in upgrade with proven dyno-tested results. Below, find each engine’s strengths, ideal buyers, and any notable limits.
| Engine | Horsepower / Torque | Best For | Notes |
|---|---|---|---|
| 400 c.i. Long Block | 500 HP / 500 ft-lbs | High-performance street/strip | Long block; great top-end potential. |
| 383 c.i. Deluxe Dressed (Carbureted) | 436 HP / 443 ft-lbs | Classic Chevy builds with carburetor | Deluxe dressed; carbureted setup. |
| 350 c.i. Base Dressed (Carbureted) | 390 HP / 410 ft-lbs | Balanced street cruiser | Versatile, carbureted base model. |
| 350 c.i. Base Dressed (Carbureted) — 341 HP | 341 HP / 371 ft-lbs | Budget-friendly swap | Lower power option but reliable. |
| 383 c.i. Base Dressed (Fuel Injected) | 436 HP / 443 ft-lbs | Modern EFI swap | Fuel-injected base dressed option. |
BluePrint GM 400 Small Block Engine – 500 HP
Horsepower: 500 HP / Torque: 500 ft-lbs. Cylinder Heads: Aluminum, BluePrint Engines. Compression: 10.3:1. Camshaft: Hydraulic Roller (.553 Intake / .576 Exhaust). Duration @ .050: 236 / 242 degrees with 110 LSA. Piston: Forged. Crank: Forged Steel, 3.750″ Stroke, 5.700″ rods. Best for: enthusiasts seeking high horsepower in a modernized 400 small block package. This long block is designed for straightforward installation with performance-focused internals. Caution: verify fitment with your vehicle’s transmission and accessory setup; not every chassis accommodates a 3.75″ stroke without clear clearance checks.
BluePrint 383 c.i. Deluxe Dressed Carbureted
Horsepower: 436 HP / Torque: 443 ft-lbs. Cylinder Heads: Aluminum. Compression: 10:1. Cam: Hydraulic Roller (.544 / .555). Duration @ .050: 230 / 236 degrees, LSA 110. Piston: Hypereutectic. Crank: Steel, 3.750″ stroke, 5.700″ rods. Best for: carbureted street performance with strong mid-range power and reliable fabrication. This deluxe package suits classic builds that want a bold idle and strong torque curve. Caution: carburetor and manifold compatibility should be checked for your specific intake and exhaust setup.
BluePrint 350 c.i. Base Dressed Carbureted
Block: Cast Iron, 4-Bolt Main, 4.000″ bore. Rear main seal: 1-Piece. Rotating Assembly: Cast Crank 3.480″ Stroke; 5.700″ connecting rods. Pistons: Hypereutectic. Heads: Aluminum H8002K with 64cc chambers. Cam: Hydraulic Roller .495 Intake / .502 Exhaust; Duration @ .050: 220 / 224; Lobe Separation 114. Includes: Holley 670 CFM, dual plane intake, Blueprint valve covers, and related hardware. Best for: buyers wanting a robust, carbureted small block swap that’s widely compatible with classic Chevys. Caution: carburetor and intake combination must be matched to your vehicle’s needs and emission requirements.
BluePrint 350 c.i. Base Dressed Carbureted — 341 HP
Horsepower: 341 HP / Torque: 371 ft-lbs. Cylinder Heads: Aluminum. Compression: 9.2:1. Cam: Hydraulic Roller (.477 / .471). Duration @ .050: 202 / 212; LSA 115. Crank: Cast with 3.480″ stroke; 5.700″ rods. Best for: entry-level swaps or budget-constrained builds that still seek modern features. Caution: lower horsepower means less mid-range torque for heavy vehicles or high-drag applications.
BluePrint 383 c.i. Fuel Injected Base Dressed
Horsepower: 436 HP / Torque: 443 ft-lbs. Cylinder Heads: Aluminum. Compression: 10:1. Cam: Hydraulic Roller (.544 / .555). Duration @ .050: 230 / 236; LSA 110. Crank: Steel, 3.750″ stroke; 5.700″ rods. Fuel System: Injected. Best for: modern EFI swaps that require reliable electronic control and easier cold starts. Caution: EFI systems add complexity and require compatible intake, fuel rails, and ignition control configuration.
Buying Guide: Key Considerations for a 400 Small Block Crate Engine
- Power needs: Are you chasing maximum horsepower or balanced street drivability? Higher horsepower models typically require stronger backing components and careful tuning.
- Fuel system: Carbureted vs. fuel-injected affects installation, tuning complexity, and cold-start behavior. EFI is easier for modern vehicles; carbureted options suit classic builds.
- Vehicle compatibility: Check distributor, intake manifold, exhaust clearance, and accessory drive alignment with your chassis and transmission.
- Internal components: Aluminum heads reduce weight and help heat dissipation; forged internals increase durability but may impact price.
- Installation readiness: Some engines come as long blocks or dressed kits; confirm what is included (carb, fuel pump, intake, valve covers) to avoid missing parts during install.
Frequently Asked Questions
- What is a 400 small block crate engine best for? It is ideal for classic Chevy builds and restomods that demand strong power, reliable internals, and a straightforward installation.
- Carbureted vs. EFI—how to decide? Carbureted engines are simpler and evoke a classic feel; EFI offers easier startup, better cold weather performance, and modern tuning options.
- Will a 400 small block fit my Chevy? Most 400 small blocks are designed for common Chevy chassis, but confirm engine mount, bellhousing, and transmission compatibility for your specific model.
- Are these engines dyno-tested? Many BluePrint crate engines are dyno-tested prior to shipping to ensure tolerances and a plug-and-play experience, though specifics vary by model.
- What maintenance should I expect after installation? Regular fuel, oil, and coolant checks, plus periodic valve train and ignition service as with any performance engine build.
- Can I use these engines in non-original chassis? Some are designed for broad compatibility with swap-friendly packages; verify mounting and accessory fit before purchasing.