• HP and Torque: 491 HP / 509 FT LBS
• Compression Ratio: 10.4:1
• Aluminum Heads
• Hydraulic Roller Cam
• Forged Crank
• Forged Pistons

Block:

• NEW BluePrint Cast Iron Block
• Manufactured and Machined in the USA!
• Align honed main bearing bore
• Cylinders honed on computer controlled machine to within .0002 straightness and roundness
• Cylinders are sonic tested for thickness
• 4-Bolt Main
• 4.000" Bore
• 1-Piece Rear Main Seal
• Mech fuel pump provision: Yes
• Passenger Side Dipstick
• Drilled and tapped for clutch linkage

Rotating Assembly:

• BluePrint Aluminum Cylinder Heads - HP8103
• 64cc chamber
• 2.08" intake/1.60" exhaust valves
• 220cc intake/67cc exhaust runners

Cylinder Heads:

• Cast Iron
• Hardened retainers and springs
• 1.94 swirl polished intake valves
• 1.60 swirl polished exhaust valves

Cam Specs:

• Cam Type: Roller
• .544 Intake .555 Exhaust
• 230 Intake / 236 Exhaust duration
• @ .050, 110 degrees lobe separation angle

Ignition Timing

• 34 degreess total at 3500 RPM

Notes

• *A bronze distributor gear is NOT recommended on this engine
• Not for use in pollution controlled vehicles
• This engine features a true 4-inch bore, which mathematically yields 389 CID with a 3.875-inch stroke