Classic trucks demand massive displacement, making the ATK GM 540 660HP the ultimate street weapon. This massive 8.8L cast iron block features high-velocity aluminum heads and hydraulic rollers. Bolt on your high-rise intake. Fire it up.

• Gigantic 540 cubic inches crush dyno numbers
• Retro-fit roller valvetrain optimizes valve lift velocity
• Two piece rear main fits classic oil pans
• Aluminum heads keep massive engine temps stable

Down the drag strip this fully dressed ATK GM 540 660HP stroker puts down class-leading performance. It comes topped with a massive carbureted manifold and high-cfm carburetor. Punch the throttle. Green light launch.

• Full stage three carburetor setup eliminates induction guessing
• Assembled bottom end reduces precious garage bench hours
• Aluminum cylinder heads flow extreme fuel mixtures

Swap this heavy duty ATK GM 383 515HP iron LS block straight into your drift chassis. Generates 515 plus horsepower with aluminum heads and a stroker crankshaft. Plug in your custom computer. Drift local tracks.

• Six point three liters build heavy mid-range torque
• Aluminum cylinder heads flow incredible exhaust volumes
• Internal balance prevents high speed crank failure
• Modern one piece main seal eliminates blowby leaks
• Ten point three compression requires premium pump fuel

Forget junkyard rebuilds and buy this reliable ATK GM 383 515HP long block package. This 6.3L LS hybrid combines iron block strength with lightweight aluminum cylinder heads. Supply your intake manifolds. Hit the road.

• Hydraulic roller valvetrain runs quiet on highways
• Aluminum heads slash heavy front axle weight
• Stroked displacement provides massive tire spinning torque

Offshore boat captains trust the compact ATK Marine DM07 305 long block to replace tired factory power. Tough cast iron heads meet a reliable hydraulic flat tappet camshaft. Bolt on your marine exhaust manifolds. Launch the boat.

• Internal balance eliminates annoying mid range vibration
• Two piece main seal fits vintage oil pans
• Fully assembled long block saves weekend repower hours

Bilge spaces stay dry when you swap in this fresh ATK Marine DM20 350 small block engine. We assemble this 5.7L iron block with heavy cast iron cylinder heads. Torque down your raw water pump. Cruise local channels.

• Internal engine balance ensures smooth RPM sweeps
• Hydraulic flat tappet lifters operate under constant load
• Cast iron block structure resists salt water corrosion
• Fits standard small block Chevy marine exhaust risers
• Includes fresh cast iron cylinder head assemblies

Deep water offshore haulers demand the legendary ATK Marine DM32 454 cast iron big block. This massive 7.4L repower package utilize rigid cast iron heads and flat tappet lifters. Connect your stern drive. Run wide open.

• Massive big block torque pulls heavy offshore hulls
• Two piece rear main seal matches classic installations
• External engine balancing keeps heavy crankshafts rotating true

Boating season demands the rock solid reliability of this ATK Marine DMA1 351W Ford Windsor long block. Cast iron construction guarantees massive thermal durability under constant load. Bolt on your raw water system. Catch the tide.

• Sturdy Ford Windsor block yields high torque
• One piece rear main stops messy bilge drips
• Hydraulic flat tappets deliver quiet marine idle characteristics
• Fully assembled cylinder heads meet factory deck heights

Pull tubers with ease by dropping this roller valvetrain ATK Marine DMC7 4.3L V6 under the hatch. Features a modern one piece rear main seal and OE style roller lifters. Bolt down your raw water lines. Start cruising.

• Hydraulic roller camshaft keeps valvetrain wear minimal
• One piece rear seal prevents oil pan leaks
• Rigid cast iron heads handle harsh marine loads

Offshore vessels secure ultimate dependability with the ATK Marine DMH4 350 roller crate engine. Heavy-duty cast iron block and cylinder head architecture stand up to harsh saltwater duty. Install your ignition. Cruise with confidence.

• OE roller cam design ensures modern valvetrain efficiency
• Single piece rear seal prevents oil bilge contamination
• Assembled bottom end eliminates custom shop setup hours
• Internal external balance options accept standard marine couplers

Stop risking tired older hardware and drop this ATK Marine DMM6 350 small block in your boat. It features reliable cast iron cylinder heads and a simple hydraulic flat tappet camshaft. Connect your stern drive. Head out today.

• Flat tappet lifters operate under steady throttle loads
• Single piece rear seal protects dry engine couplings
• Internal external balancing matches standard marine flywheels

Forget standard automotive swaps because the ATK Marine DMW3 4.3L V6 is built for water. This rebuilt 262 cubic inch platform features cast iron heads and a roller valvetrain. Bolt down your brackets. Pull heavy wakeboarders.

• V6 packaging saves valuable cockpit hatch space
• Hydraulic roller camshaft keeps idle characteristics quiet
• One piece rear seal keeps raw oil contained
• Cast iron heads manage relentless marine thermal loading

At the saltwater inlet you need the ATK Marine VM29 4.3L V6 to fight constant corrosion. This stage two rebuild includes a cast iron block, timing cover, oil pan, and valve covers. Connect your starter. Venture out further.

• Mid dress setup includes pre-installed marine oil pan
• Roller camshaft style optimizes low end torque curve
• One piece rear seal guarantees clean bilge areas
• Included valve covers save valuable assembly lab time

Cabin cruisers regain reliable lake performance with the ATK Marine VMB3 305 long block swap. This budget friendly 5.0L iron block runs flat tappet lifters and has a pre-installed pan. Bolt on your manifold. Cruise local channels.

• Small block design fits tight bilge engine boxes
• Included oil pan simplifies drop-in installation process
• Flat tappet cam runs smooth on cheap fuel
• Cast iron cylinder heads match stock cooling patterns
• One piece main seal provides a dry seal