HP & 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:
New BluePrint Forged Crankshaft
3.875 ” Stroke
Forged I-beam 6.000″ connecting rods
Forged Pistons
Internal Front/ External Rear
CYLINDER HEADS:
BluePrint Aluminum Cylinder Heads – HP8103
64cc chamber
2.08″ intake/1.60″ exhaust valves
220cc intake/67cc exhaust runners
CAM SPECS:
Cam Type: Roller
.544 Intake .555 Exhaust
230 Intake / 236 Exhaust duration
@ .050, 110 ° lobe separation angle
IGNITION TIMING:
34 degrees total at 3500 RPM
ALSO INCLUDES:
Valve covers, oil pan and timing cover
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.
93 octane or higher is recommended for this engine.
The performance aluminum cylinder heads on this engine feature a .500 raised port vs OEM.