BluePrint BP3505CT GM 350 390 HP Long Block Crate Engine

Description

Power vintage muscle cars and trucks using the BluePrint BP3505CT Crate Engine in Stage 1 aluminum head long block trim. Displacing 350 cubic inches, this small block Chevrolet produces 390 horsepower at 5,500 RPM and 410 lb-ft torque at 3,800 RPM. Engineered with lightweight aluminum heads and a hydraulic roller cam, it equips builds with high-flow modern performance.

A precision-machined 4-bolt main cast iron GM block features a modern 1-piece rear main seal to eliminate lubricant loss on garage floors. The rotating group combines a nodular cast iron crankshaft, forged connecting rods, and 9.5:1 hypereutectic pistons across a 4.000-inch bore. Stroke measures 3.480 inches, supported by balanced components and a 5-quart passenger-side dipstick steel oil pan.

Key Features of BluePrint BP3505CT

Restoration builders buy BluePrint BP3505CT crate engine packages to drop high-revving small-block Chevrolet power into project cars while personalizing induction components. This long block package fits vintage Camaros, Chevelles, and custom C10 haulers.

• 64cc aluminum combustion chambers shed unwanted combustion heat to suppress knock on service-station fuel supplies.
• 195cc intake runners accelerate incoming air velocity for massive mid-range acceleration and instant throttle recovery.
• 0.495-inch lift hydraulic roller camshaft profiles optimize valve events for rapid acceleration off standing launches.
• Broad powerband spans from 1,800 up to 5,800 RPM for exceptional street drivability and highway passing authority.
• 1.5:1 ratio roller rockers guide valves without valve stem galling during hard quarter-mile acceleration pulls.
• BluePrint BP3505CT long block models arrive with a double-roller timing set maintaining precise camshaft phasing.
• Front timing cover and fabricated aluminum valve covers arrive installed to seal internal components during installation.
• Passenger-side dipstick location clears factory starter motor wiring and aftermarket tubular exhaust headers.

Dyno Profile Valvetrain Behavior

Dynamometer calibration tests confirm 390 brake horsepower at 5,500 RPM supported by 410 lb-ft torque at 3,800 RPM. Designed for 91-octane pump gasoline, the combusion chambers resist detonation under hot weather conditions. Camshaft timing provides 15 in-Hg manifold vacuum at 800 RPM to support power brake servos. The internal oil lubrication system sustains 45 to 65 PSI warm oil pressure across highway cruising speeds.

Engine Bay Bellhousing Clearance

Exterior block dimensions follow classic Chevrolet small-block parameters, seating between factory GM frame crossmembers without chassis cutting. The 1-piece rear seal crankshaft flange requires an external-balance flexplate or flywheel to mate with TH350, 700R4, or manual transmissions. Motor mount points accept factory GM frame stands without steering box contact.

Break-In Protocol Maintenance Limits

Pre-lubricate the engine using a mechanical pump shaft drill adapter to fill all internal oil channels before initial starter cranking. Break-in procedure demands 10W-30 conventional oil loaded with high levels of zinc and phosphorus additives. This street performance engine is not engineered for marine bilge setups, forced induction past 6 PSI, or competition nitrous use.

• Replace the break-in motor oil and spin on a fresh filter after the first 500 vehicle miles.
• Inspect valve lash stability and check accessory bracket bolts every 3,000 miles of street operation.
• Check cylinder head bolt torque and inspect cooling system thermostat operation every 12 months or 12,000 miles.

Warranty Statement Shipping Inventory

BluePrint covers this Chevrolet small-block package with a 30-Month or 50,000-Mile factory warranty against defects in materials and craftsmanship. The secure wooden crate holds the assembled long block, aluminum cylinder heads, timing cover, oil pan, valve covers, instruction manual, and official dynamometer verification sheet.