MBP3550CT Small Block Chevy 355ci Base Marine Engine 365HP/390TQ

Name: MBP3550CT Small Block Chevy 355ci Base Marine Engine 365HP/390TQ
Brand: BLUEPRINT ENGINES
SKU: 138-MBP3550CT
Price: 6799.00 USD
Availability: InStock

^$6,799⁰⁰

Truck Freight

Ships on 09/18/2026

Lowest Price Guarantee

Base Engine

365HP/390TQ

Engine Break-In Procedure
Use or break-in oil or conventional (non-synthetic) multi-viscosity oil with zinc additive for the first 30 hours of operation. Avoid hard acceleration for sustained periods. Periodically change the engine speed to help seat the rings. While the engine is running, be sure to check oil pressure and coolant temperature, and check for fluid leaks, such as oil, fuel, and coolant/antifreeze. Also listen for any unusual sounds. Should you hear an unusual sound, shut the engine off, check for the source, and correct it.
Engines with flat tappet cams only - Start the engine and bring it to 2,000 RPM. Get the engine running smoothly. Then vary the engine speed from 1,800-2,200 RPM in a slow acceleration/deceleration cycle for 30 minutes. This is necessary to provide adequate oil splash and lifter rotation to properly mate each lifter to its lobe.
After 30 hours of operation change the engine oil and filter. For flat tappet cam engines, continued use of oil with zinc or a zinc additive for the life of your engine is recommended.

Blueprint Engines are a great choice for drivable and reliable high performance engines. All rotating assemblies are balanced within 2 grams on a computerized balancer. Blueprint Engines are dyno tested and include dyno sheets.
Best of all they feature a 1 year/Unlimited hours warranty (pleasure craft only).

Recommended Fuel: 91 Octane

Block:

4-bolt main block
Passenger side dipstick
Square and parallel decked
Align honed main bearing bore
Cylinders are sonic tested for thickness
Cylinders honed on a computer controlled machine to within .0002'' straightness and roundness

Rotating Assembly:
3.48'' stroke cast crankshaft (1 piece rear main seal)
Chevy 5.7'' heavy beam rods with 150,000psi bolts
Keith Black hypereutectic pistons
Hastings Moly rings
Clevite bearings
Internally balanced rotating assembly
Melling high volume oil pump
Heavy duty double roller timing set

Cylinder Heads:
GM Vortec cast iron heads
Hardened retainers and 1.25'' diameter valve springs
2.02'' swirl polished intake valves
1.60'' swirl polished exhaust valves
Hardened pushrods
Long slot rockers with positive-locking adjuster nuts

Camshaft Specs:
Comp Cams Hydraulic Flat Tappet
Duration @ .050'' Lift: 218 Intake / 224 Exhaust
Lift: .462'' Intake / .477'' Exhaust
Lobe Separation: 112°

Other Features:
Brezenski cast iron marine intake
Signature Series polished aluminum valve covers
Chrome timing cover
New 6-quart rubber coated oil pan
Brass freeze plugs
9.5:1 compression

Dress Model Adds:
Edelbrock 600 cfm Electric Choke Marine Carburetor - 350-1409
Stainless steel fuel line and filter
Edelbrock fuel pump
Professional Products Balancer
Distributor
Coil
MSD spark plug wires

Note: 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.
Part Number: MBP3550CT
Fuel Delivery Type: Carbureted
Spark Plug: AC 41-993
Spark Plug Gap: .045"
Intake Manifold: Marine, Cast Iron
Timing (Initial/Total Advance): Initial Timing - 10-16° and Total Timing 32-34°
Firing Order: 1-8-4-3-6-5-7-2