- 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.
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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
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ATK Engines HP90
ATK Engines HP90 High Performance Marine Crate Engine Small Block Chevy 383ci / 345HP / 445TQ
$4,417.99
Estimated to ship direct from manufacturer on 11/20/24, pending manufacturer availability.
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$4,417.99
Estimated to ship direct from manufacturer on 11/20/24, pending manufacturer availability.
FREE Shipping
Lowest Price Guarantee