BluePrint PSLS4272SCT Pro LS 427 800 HP EFI Dressed LB

Description

Excessive valvetrain fatigue demands the BluePrint PSLS4272SCT Long Block Engine, built for commercial long block repower operations requiring high boost tolerance without loose top end parts. This 427 cid 7.0L LS engine generates 800HP at 6,200 RPM. Machinists must check intake manifold port matching because cathedral port manifolds do not seal against these rectangular port heads.

Engineers cast the block from high tensile gray iron with 6-bolt splayed main caps. A forged 4340 steel crankshaft and forged H-beam connecting rods reinforce this BluePrint engine core. Starter draw measures 185A on standard 12V shop circuits. Total dry weight registers at 465 lbs with dimensions of 27in length by 25in width by 28in height. Pan capacity requires 7.0 quarts.

Key Features of BluePrint PSLS4272SCT

Shop owners buy BluePrint PSLS4272SCT Long Block Engine packages to eliminate machining shop downtime during an industrial engine rebuild project. Each cylinder head receives severe duty stainless steel valves to withstand intense forced induction heat.

• Rectangular port aluminum cylinder heads feature 6-bolt per cylinder clamping for maximum gasket retention.
• A custom ground hydraulic roller camshaft provides stable valve actuation under continuous boost loads.
• Forged dished pistons lower static compression ratio to 9.5:1 for safe forced induction operation.
• The PSLS4272SCT commercial core holds 0.0019in rod bearing oil clearances under extreme dynamometer testing.
• Cross bolted main caps eliminate main journal movement under severe combustion chamber pressure.
• A double roller timing chain prevents cam timing retard under rapid engine acceleration.
• Multi layer steel head gaskets seal high cylinder pressure against the precision machined deck.

Dynamometer Load Bench Test Limits

Dyno bench certification confirms 800HP at 6,200 RPM and 780 ft-lbs torque at 4,400 RPM for this PSLS4272SCT long block engine. Gauge monitors record 58 PSI oil gallery pressure at 2,200 RPM with oil temperatures stabilizing at 195°F. Cylinder compression checks record 170 PSI across all eight cylinders within 3% balance. Crankshaft runout checks show 0.0002in TIR total runout. Exhaust temperature probes report 1,310°F under peak load.

Shop Installation Maintenance Protocol Requirements

Mechanical throttle bracket setups demand 5 lbs return spring pull force to ensure positive valve return. Mechanics should not install this heavy duty replacement engine into vehicles with stock drivelines unable to withstand 780 ft-lbs torque or systems lacking external oil coolers.

• Discard break in oil after 500 miles or 20 hours then fill with 15W-50 motor oil.
• Inspect valve tip contact patterns and rocker trunnion bearings during the initial scheduled service.
• Torque cylinder head studs in proper sequence up to 85 ft-lbs following initial thermal break in.

Crate Manifest Warranty Protection Coverage

Backed by the BluePrint build standard, this package features a 3-Year or 50,000-mile warranty. The rugged wooden crate contains the long block core, oil pan, harmonic balancer, aluminum valve covers, timing cover, oil pump pickup, plus official dynamometer verification sheets.