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Crate Engines, GM 496 C.I.D. 561 HP Stroker 7.4/454 Base, 8.1L/496 Actual, Assembled, Internal Balance, Gen VI Block, Forged Internals, Chevy, Each

BluePrint Engines GM BB compatible 496 c.i.d. Stroker long block base crate engines with forged components are built to accept power adders like turbochargers, superchargers, NOS, etc. They're built to deliver 561 hp and 512 lbs.-ft. of torque. The engines also include valve covers, an oil pan and timing cover. Compression ratio: 8.8:1

Engine specifications:

--- BLOCK:
• NEW BluePrint cast iron block
• 4-bolt main
• 4.500 in. bore
• One-piece rear main seal
• Mechanical fuel pump provision: Yes
• Standard deck

--- ROTATING ASSEMBLY:
• New BluePrint forged crankshaft
• 4.250 in. stroke
• Forged H-beam 6.135 in. connecting rods
• Forged pistons
• Internal

---CYLINDER HEADS:
• BluePrint aluminum cylinder heads
• 119cc chamber
• 2.30 in. intake / 1.88 in. exhaust valves
• 316cc intake / 124cc exhaust runners
• Cylinder heads feature a .300 in. raised exhaust port vs. an OEM casting
• Must verify header/exhaust clearance

---CAM SPECS:
• Cam type: Hydraulic roller
• .540 Intake .560 exhaust
• 242 intake / 248 exhaust duration
• @ .050 - 114-degree lobe separation

--- IGNITION TIMING:
• 10-16 degrees and total timing 32-34 degrees

---NOTES:
• Replaces BP49610CT
• Built with dual keyway crankshaft for harmonic balancer
• SFI harmonic balancer included on engine
• Not for EGR
• Must verify header/exhaust clearance