Blueprint Engines BP3503CT1N features outstanding street performance on a budget. This dress engine comes complete with a performance-matched intake and distributor, removing any guesswork.

Engine Specifications

Power Ratings:

• Horsepower: 373 @ 5500 RPM
• Torque: 400 lb/ft @ 4000 RPM

Block Information:

• 1987-1995 seasoned OE block
• 2-bolt main
• 1-piece rear main seal
• Passenger side dipstick 
• Displacement: 350 cubic inch

Rotating Assembly:

• Crankshaft: Cast steel 3.480 in. Stroke
• Balance: External rear (requires 1987-Up style flexplate or flywheel), internal front
• Rods: OEM type 5.700 in. Length
• Compression Ratio: 9.3:1
• Pistons: Hyperuetectic
• Rings: Moly

Camshaft Specs:

• Camshaft: Hydraulic roller tappet 
• Cam Duration @ .050 in.: Intake 221 / Exhaust 226
• Cam Lift: Intake .495 in. / Exhaust .502 in.
• Lobe Separation Angle: 110

Cylinder Head Information:

• Cylinder Heads: Vortec cast iron
• Combustion Chamber: 64 cc
• Valve Size: 1.940 in. Intake / 1.500 in. Exhaust
• Rocker Arms: 1.5

Oil Pan Information:

• Oil Pan: Black 5 quart
• Oil Pump: Standard volume

  Long Block Includes

• Short Block
• Camshaft
• Timing Set
• Cylinder Heads
• Valve Covers
• Timing Cover
• Oil Pan
• Oil Pump & Pickup Tube
• Intake Manifold
• Distributor
• Harmonic Balancer

Notes

• If replacing a pre-1987 (2-piece rear main seal) engine, a new external balance flexplate/flywheel for 1987-Up style engines will be required.
• This engine has provisions for a mechanical fuel pump
• Compatible with 87 octane 
• Initial Timing 14-degrees and Total Timing 34-degrees Recommended 
• 1800-2200 Stall Converter Recommended 
• 600 CFM Carburetor recommended
• NOT compatible as OE replacement for Vortec truck EFI, there are no provisions for cam sensor
• NOT for EGR or use in Emission controlled vehicles

Engine Break-In Procedure

Use or break-in oil or conventional (non-synthetic) 10w30 oil with zinc additive for the first 500 miles of operation.  Do not drive for long periods at any single speed, always vary your speed. Do not tow a trailer or put other heavy loads on the vehicle. It is best to avoid long periods of idling during this period. Check the engine oil and coolant levels daily. 

Engines with flat tappet hydraulic cams only - Run the engine between 2,000 and 2,500 RPM's, with no-load on the engine for the first 30 minutes. Let the engine cool down completely and repeat the process 2-3 more times. Do not idle the engine for an extended period at this time, this is critical to break-in the camshaft.

At 500 Miles change the engine oil and filter using conventional (non-synthetic) oil with a zinc additive. Check fuel and ignition settings, adjust valves (where applicable).  Drive the next 500 miles normally, without high RPM's (below 5000 RPM), hard use, or extended periods of high loading or long periods of idling.

Change the oil and oil filter again at 1,000 miles. Continue using conventional (non-synthetic) oils and zinc additive, until about 4,000 miles. At that point, you may run a quality 10w30 synthetic oil if you choose. The use of oil with zinc or a zinc additive for the life of your engine is recommended.