Big Block Power is back with out a big price. ATK Performance put together an awesome upgrade for that tired 454 in your boat.

Stage: 1
HP: 415
TORQUE: 497
Engine Type: Chevy Big Block V8
Displacement (cu.in): 454
Block: 2 Bolt Early Style
Bore / Stoke: 4.280 X 4.000
Crankshaft: OE 2 Piece Seal
Rods: OE
Pistons: Hypereutectic
Rings: Moly

Camshaft Type: HYD. Flat Tappet
Camshaft Lift: .489 IN X .520 EX
Camshaft Duration @.50: 224 IN X 234 EX
Cylinder Head Type: OE 75-89 Peanut Port
Chamber Size: 118 cc
Valve Size: 2.06 IN X 1.72 EX
Intake Runner Volume: OE
Compression Ratio: 8.5:1
Rocker Arm Type: Stamped Steel
Rocker Arm Ratio: 1.7:1
Sheet Metal: Chrome V/C T/C Black O/P
Recommended Fuel: 92 Octane
Ignition Timing: 36 Degrees Total Advance
Max RPM: 5800
Warranty: 1 Year
Dyno Proven: YES