ATK HP Marine Crate Engine Small Block Chevy 383ci / 345HP / 445TQ

Engines & Components
Engine - Assembled / Ready-to-Run
ATK HP Marine Crate Engine Small Block Chevy 383ci / 345HP / 445TQ

In 2007 ATK launched a High Performance Division with one of the finest engine shops in the country. By reverse engineering all of their engines, they are able to eliminate any OEM deficiencies. This makes an ATK-built crate engine have a superior design over the original engine by incorporating better components when needed. These quality built engines are offered in three different stages for ease of finishing an engine swap. ATK HP engines feature an 18-month/unlimited hour warranty.

Engine Specifications

Horsepower: 345 hp
Torque: 445 lb/ft

Block Information:

Seasoned OE 4 bolt main 1pc seal 1996-2000
Bore/Stroke: 4.040" x 3.750"
Displacement: 383ci

Rotating Assembly:

Crankshaft: Scat nodular iron
Balance: External rear, internal front
Rods: Scat 4340 I Beam 5.7" with ARP 8740 bolts
Compression Ratio: 9.5:1
Pistons: Hypereutectic
Rings: Moly

Camshaft Specs:

Camshaft: Hydraulic roller
Cam Duration @ .050": Intake 210 / Exhaust 215
Cam Lift: Intake .462" / Exhaust .470"
Lobe Separation Angle: 112lsa
Timing Chain: Double roller

Cylinder Head Information:

Cylinder Heads: Dart Vortec cast iron
Combustion Chamber: 67cc
Intake Runner: 165cc
Valve Size: 2.02" Intake / 1.60" Exhaust
Rocker Arms: Stamped steel 1.5 ratio

Oil Pan Information:

Oil Pan: Rear sump 5qt (not for Chevelles with steering behind crossmember, some Corvettes, and 1962-1967 Chevy II's
Oil Pump: Melling standard volume

Base Engines

Short Block
Camshaft
Timing Set
Cylinder Heads
Valve Covers
Timing Cover
Oil Pan
Oil Pump & Pickup Tube
Flexplate

Filter By Vehicle

ATK HP Marine Crate Engine Small Block Chevy 383ci / 345HP / 445TQ

ATK Engines HP90 High Performance Marine Crate Engine Small Block Chevy 383ci / 345HP / 445TQ

ATK Engines HP90 High Performance Marine Crate Engine Small Block Chevy 383ci / 345HP / 445TQ