The Blueprint Engines 383 Stroker Kit has become a go-to solution for Chevy enthusiasts who want to unlock serious power without swapping to a completely different engine platform. Designed to turn a standard 350 small-block into a high-displacement torque monster, this kit delivers a genuine performance transformation. In this guide, we will walk through exactly what the kit includes, the real-world horsepower and torque gains you can expect, a detailed step-by-step installation guide, and a comprehensive cost breakdown so you can budget your build with confidence.

What Is the Blueprint Engines 383 Stroker Kit?

The 383 Stroker Kit from Blueprint Engines is an aftermarket rotating assembly that increases the displacement of a GM small-block Chevy from 350 cubic inches to 383 cubic inches. This is achieved by using a longer stroke crankshaft (usually 3.750 inches) combined with a standard 4.030-inch bore, or sometimes a slight overbore. The kit typically includes the following components:

  • Forged or cast crankshaft with a 3.750-inch stroke
  • H-beam or I-beam connecting rods (often forged 4340 steel)
  • Forged pistons with proper pin height and ring packs
  • Piston rings (moly or ductile iron)
  • Main and rod bearings
  • Freeze plugs and cam bearings (in some kits)

Blueprint Engines offers these kits in several configurations, from budget-friendly cast crank assemblies to fully forged, high-RPM capable builds. Most are designed for street and mild strip use, with compression ratios ranging from 9.5:1 to 10.5:1, making them compatible with pump gas.

The target vehicle is any classic or custom car, truck, or hot rod that originally came with a small-block Chevy 350 – think C10 pickups, Camaros, Novas, Chevelles, and even Jeep CJs with Chevy swaps. The 383 stroker retains the same external dimensions as a 350, so it drops in without major chassis modifications.

Performance Gains: Real-World Dyno Data

Moving from a 350 to a 383 cubic inch displacement produces substantial gains across the entire RPM band. With a mild cam and iron heads, a typical Blueprint Engines 383 Stroker Kit can produce:

  • Horsepower: 400 to 450 hp at 5,500-6,000 RPM
  • Torque: 450 to 520 lb-ft at 3,500-4,000 RPM

To put that in perspective, a stock GM 350 (L-48 or similar) from the 1970s-80s made around 200-250 hp at the flywheel. Even a modern crate 350 (like the GM Goodwrench 350) is rated at roughly 260-300 hp. The 383 stroker kit effectively doubles power output while offering a much fatter torque curve that makes everyday driving more responsive.

Dyno results from independent builders confirm the gains. For example, Chevy Hardcore tested a 383 with a Blueprint-style rotating assembly, aluminum heads, and a hydraulic roller cam – it laid down 452 hp and 477 lb-ft on pump gas. Even with budget iron heads, the kit consistently delivers over 400 hp.

The key advantage of the 383 over the 350 is torque. The extra 33 cubic inches shift the torque peak lower, meaning you get stronger pulls from idle to redline. This makes the engine especially fun in heavy vehicles like trucks and station wagons, and it dramatically improves towing and mid-range passing power.

Installation Process

Installing a Blueprint Engines 383 Stroker Kit is not a beginner-level job. It requires mechanical experience, engine-building tools, and a clean workspace. Below is a detailed, step-by-step guide.

Pre-Installation Preparation

  1. Gather tools and parts: Torque wrench (ft-lb and in-lb), engine stand, micrometer, dial bore gauge, plastigauge, assembly lube, gasket set, and a new timing set. Also have replacement fluids and a break-in oil (high-zinc).
  2. Inspect the engine block: If reusing a 350 block, have it cleaned, magnafluxed, and machined to the proper bore. Blueprint recommends a 4.030-inch bore. Check the decks for flatness and main bearing bore alignment.
  3. Mock-up the rotating assembly: Before final assembly, install the crankshaft and a set of rods/pistons to check for clearance issues. The longer stroke often requires grinding the block for connecting rod bolt clearance at the bottom of the cylinders. This is known as “clearancing.”

Engine Tear Down

  1. Remove the intake manifold, cylinder heads, oil pan, timing cover, and harmonic balancer.
  2. Unbolt and remove the old connecting rods and pistons. Mark the caps for cylinder position.
  3. Remove the camshaft, lifters, and timing chain. Keep all old parts aside.
  4. Thoroughly clean the block using hot soapy water and a brush, then blow out all oil passages with compressed air. Install new cam bearings and freeze plugs if needed.

Assembling the Short Block

  1. Install the main bearings: Apply assembly lube to the bearing shells and install the crankshaft. Torque the main caps in sequence to spec (typically 70-80 ft-lb). Check crankshaft end play and rod-journal clearance with plastigauge.
  2. Install the pistons and rods: Use a ring compressor to slide each piston into the cylinder, then install the rod caps with proper torque (around 50-60 ft-lb for ARP bolts). Ensure the notch on the piston faces the front of the engine.
  3. Check piston-to-valve clearance: With clay on the piston tops, temporarily install the heads and rotate the engine through two complete revolutions. Measure the clay to ensure at least 0.080 inch clearance. Adjust cam timing or piston valve reliefs if needed.
  4. Install the timing set: Align the dots on the cam and crank sprockets. Blueprint kits often come with a double-roller timing chain for strength.
  5. Install the camshaft: Lubricate the cam lobes and journals thoroughly. Install the thrust plate and torque bolts.
  6. Install the oil pump and pickup tube: Use a new pump and a deep sump oil pan if the kit requires it. A high-volume pump is recommended for the 383’s larger oil capacity.
  7. Install the harmonic balancer: Use the correct installation tool; never hammer it on.

Final Assembly and Break-In

  1. Install cylinder heads with new head gaskets. Torque to spec in a proper sequence (typically 65-70 ft-lb for iron heads).
  2. Install the intake manifold, valve covers, timing cover, and water pump. Use RTV silicone at the front and rear china walls.
  3. Install new spark plugs, ignition wires, and distributor. Set initial timing to around 12 degrees BTDC.
  4. Fill the engine with break-in oil (high zinc) and coolant. Prime the oil system using a drill-driven priming tool until the oil pressure gauge shows pressure.
  5. Break-in procedure: Start the engine and immediately bring it to 2,000 RPM for 20-30 minutes. Do not let it idle. Vary RPM between 2,000 and 3,000. After break-in, change the oil and filter. Retorque the head bolts and adjust valves if needed.

Common pitfalls during installation include insufficient clearance between connecting rods and the block, improper piston ring end gap, and using standard head gaskets that may not handle higher compression. Always check all clearances twice.

Cost Breakdown: Detailed Budget Analysis

A realistic budget for a Blueprint Engines 383 Stroker Kit installation depends on whether you do the work yourself or hire a shop. Below is a line-item breakdown:

Item Range (USD) Notes
Blueprint Engines 383 Stroker Kit (cast crank, forged pistons) $3,500 – $4,500 Includes crank, rods, pistons, rings, bearings. See current pricing
Machine work (bore, hone, deck, clearancing) $400 – $800 If using a core block; avoid a block that needs sonic testing.
Block core (if not using your 350) $100 – $300 Good used 350 blocks are cheap.
Gasket set and seals $150 – $300 Fel-Pro or Mahle high-performance.
Oil pump, pickup, and pan $150 – $400 Milodon or Moroso deep sump recommended.
Timing set $80 – $150 Often included in kit, but upgradeable.
Camshaft and lifters $250 – $600 Not always included; choose a street roller for best performance.
Valve springs, retainers (if using new cam) $150 – $300 Required if upgrading cam.
Cylinder heads (if not reusing) $600 – $1,500 Aluminum heads (e.g., AFR, Brodix) maximize power.
Fuel system upgrades (carb/injectors, pump) $200 – $600 400+ hp needs at least a 600 CFM carb or larger injectors.
Ignition system (distributor, wires, plugs) $150 – $400 MSD or HEI upgrade recommended.
Tools and shop supplies (assembly lube, plastigauge, break-in oil) $100 – $250 One-time cost.
Total DIY (assuming you own the block and heads) $5,500 – $7,800 Excludes unexpected machining costs.
Professional labor (engine build and install) $1,500 – $3,000 Adds significantly to total.
Total turnkey (shop does everything) $7,000 – $11,000 Depends on scope and parts quality.

Keep in mind that many Blueprint Engines stroker kits can be purchased as a complete short block (already assembled) for roughly $5,000-$6,000. That option eliminates machine work and clearance headaches, though you still need to add cylinder heads and accessories. For those wanting the easiest path, Summit Racing stocks ready-to-run 383 short blocks.

Alternative Builds: 383 vs 400 vs LS Swap

Before committing to the 383 stroker, it is wise to compare alternatives. A 400 small-block Chevy (4.125-inch bore x 3.75-inch stroke) offers even more cubic inches but has siamesed cylinders that overheat easily and a weaker block. The 400 is also less common and harder to source aftermarket parts for. The LS engine swap (e.g., 5.3L or 6.0L) can produce similar power with modern fuel injection and lighter weight, but it requires custom motor mounts, accessory drives, wiring harnesses, and often a different transmission. The 383 stroker remains the simplest drop-in upgrade for a traditional small-block Chevy chassis, preserving the classic engine character.

For most street-driven vehicles, the 383 stroker delivers the best balance of cost, power, and compatibility. If you already have a 350 in good condition, the stroker kit is a no-brainer.

Final Thoughts

Investing in a Blueprint Engines 383 Stroker Kit is one of the most rewarding upgrades you can make to a small-block Chevy. With proper planning, careful assembly, and a reasonable budget, you can more than double your engine’s output and enjoy a torque curve that makes any ride feel brand new. Whether you choose to build it yourself following the steps above or purchase a pre-assembled short block, the result is the same: a reliable, street-friendly 383 that will make every drive memorable.

For further reading, check out this detailed Hot Rod magazine article on 383 builds and the official Blueprint Engines website for the latest kit offerings.