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Horsepower & Torque: 405 Horsepower / 450 ft. lbs. Torque
Cylinder Heads: Cast Iron Vortec
Compression Ratio: 9.5:1
Camshaft: Hydraulic Roller Cam - .495 Intake / .502 Exhaust Lift and 220 Intake / 224 Exhaust Duration @ .050 - 114° LSA
Pistons: Hypereutectic
Crankshaft: Cast Crank - 3.750" Stroke and 5.700" Rods
Fuel Recommendation: 91+ Octane
- Description
- Engine Specs
- Parts & Accessories
- Warranty
Overview:
BluePrint Engines delivers proven marine muscle with our 383 c.i. GM Marine Small Block, pumping out a crisp 405 horsepower in a dependable, carbureted package built for life on the water. This base-dressed engine comes equipped with the essential components you need for a clean, straightforward install, all engineered with the precision, durability, and corrosion-resistant quality that marine duty demands. From smooth cruising to throttle-happy fun, this 350 is designed to start easy, run strong, and keep your boat ready for every weekend adventure, season after season.
Description:
- Horsepower & Torque: 405 Horsepower / 450 ft. lbs. Torque
- Compression Ratio: 9.5:1
- Cast Iron Heads
- BluePrint Engines Hydraulic Roller Cam
- BluePrint Engines Cast Crankshaft
- BluePrint Engines Hypereutectic Pistons
Block:
- BluePrint Engines High Strength Cast Iron Block
- Square and Parallel Decked
- Align Honed Main Bearing Bore
- Cylinders Honed on Computer -Controlled Machine to Within .0002Straightness and Roundness
- Cylinders are Sonic Tested for Thickness
- 4-Bolt Main
- 4.000" Bore
- 1-Piece Rear Main Seal
- Mech Fuel Pump Provision: Yes
- Passenger Side Dipstick Drilled and Tapped for Clutch Linkage
Rotating Assembly:
- Cast Crankshaft
- 3.750" Stroke
- OEM Type 5.700" Connecting Rods w/ 150,000 PSI Bolts
- Hypereutectic Pistons
- External Front/ External Rear Engine Balance
Cylinder Heads:
- Vortec Cast Iron Cylinder Heads
- 1.94 Intake / 1.50 Exhaust Valves
- Hardened Push Rods
- Long Slot Rockers with Positive Lock Adjusting Nuts
Cam Specs:
- Hydraulic Roller
- .495 Intake / .502 Exhaust Lift
- 220 Intake / 224 Exhaust Duration
- @.050-114 Degree Lobe Separation
Also Includes:
- Marine Intake Manifold
- Valve Covers
- Marine Carburetor (Brand will vary due to supply)
- Distributor
- Oil Pan
Notes:
- This engine is designed for CARBURETED use only. It is NOT for use in any factory fuel injected applications.
- Replaces Standard Rotation engines only. Not available as reverse rotation.
- BluePrint Engines recommends the use of a flame arrestor in marine applications and advises checking local laws to ensure compliance with the United States Coast Guard Requirements for Ignition Protection & Fire Resistance.
Blocks
- BluePrint Engines High Strength Cast Iron Block
- Square and Parallel Decked
- Align Honed Main Bearing Bore
- Cylinders Honed on Computer -Controlled Machine to Within .0002Straightness and Roundness
- Cylinders are Sonic Tested for Thickness
- 4-Bolt Main
- 4.000" Bore
- 1-Piece Rear Main Seal
- Mech Fuel Pump Provision: Yes
- Passenger Side Dipstick Drilled and Tapped for Clutch Linkage
Cylinder Heads
- Vortec Cast Iron Cylinder Heads
- 1.94 Intake / 1.50 Exhaust Valves
- Hardened Push Rods
- Long Slot Rockers with Positive Lock Adjusting Nuts
Ignition Timing
Initial Timing 10-16 - Total Timing 32-34
Spark Plug
.045 in.
Firing Order
1,8,4,3,6,5,7,2
Rotating Assembly
- Cast Crankshaft
- 3.750" Stroke
- OEM Type 5.700" Connecting Rods w/ 150,000 PSI Bolts
- Hypereutectic Pistons
- External Front/ External Rear Engine Balance
Cam Specs
- Hydraulic Roller
- .495 Intake / .502 Exhaust Lift
- 220 Intake / 224 Exhaust Duration
- @.050-114 Degree Lobe Separation
Stall Converter
N/A
Also Includes
- Marine Intake Manifold
- Valve Covers
- Marine Carburetor (Brand will vary due to supply)
- Distributor
- Oil Pan
Notes
- This engine is designed for CARBURETED use only. It is NOT for use in any factory fuel injected applications.
- Replaces Standard Rotation engines only. Not available as reverse rotation.
- BluePrint Engines recommends the use of a flame arrestor in marine applications and advises checking local laws to ensure compliance with the United States Coast Guard Requirements for Ignition Protection & Fire Resistance.
Your BluePrint engine was dyno tested with the parts and specifications listed below. If you prefer to install a different part, your engine may not produce the horsepower recorded on your dyno sheet.
Parts & Accessories Specs
| Intake Manifold | Marine, Aluminum |
|---|---|
| Spark Plug (Not Included) | AC Delco 41-993 |
| Harmonic Balancer | BPP400L |
| Flexplate/Flywheel (Not Included) | BPP871006 |
| Fuel Recommendation | 91+ Octane |
| Recommended Service Oil | BPP10W30 |
| Recommended Oil Filter | BPP51061 |
| Total Oil Capacity with Production Oil Pan, and Correct Filter | 5 Quarts |
Header Partners:
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Better Than the Rest.
The satisfaction of our customers is our highest priority at BluePrint Engines. Every engine we build is assembled with premium components, balanced to within two grams, and dyno-tested to verify real horsepower and torque before it leaves our facility.
All BluePrint products include warranty protection designed specifically for how they're used. Our complete crate engines carry our industry-leading 30-month / 50,000-mile warranty, offering the confidence and peace of mind serious builders expect. Other BluePrint products—including bare blocks, marine engines, transmissions, race applications, and cylinder heads—feature warranty coverage tailored to their intended use and operating conditions.
For full terms and specific coverage by product category, download our warranty guide below. It contains complete details, limitations, and instructions for warranty registration and claims.
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Protect your investment by registering your warranty today. Register below to ensure coverage and stay up to date on important service information.
Register NowEVERY BLUEPRINT ENGINE ACES THE DYNO TEST
We make sure we hit our target horsepower and proper torque with every crate engine. We use an advanced computerized balancer in our in-house dyno testing rooms to get our rotating assemblies within two grams, ensuring silky smooth power over the entire RPM range. That’s precisely why our engines sound and run better than our competitors.
All specs, zero speculation: A comprehensive, dyno-generated printout showing your critical engine specs will accompany your delivered engine — every time. No more guessing or wondering what your installed engine’s real-world peak horsepower and torque ratings actually are. Any doubters in the crowd? Simply flash ‘em your exact engine’s dyno results.