- Engines & Components
- Engine - Assembled / Ready-to-Run
- ATK HP Crate Engines 1987-1995 Small Block Chevy TBI 383ci / 320HP / 395TQ
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 has a superior design over the original engine by incorporating better components when needed. ATK HP engines feature a 24 month/unlimited mile warranty.
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Engine Specifications
This 383 engine is designed for 1987-1995 GM trucks with throttle body injection (TBI). ECM needs a chip burned to run properly.
- Horsepower: 320 hp
- Torque: 395 lb/ft
Block Information:
- Seasoned OE 4 bolt main 1pc seal 1987-1995
- Bore/Stroke: 4.040" x 3.750"
- Displacement: 383ci
Rotating Assembly:
- Crankshaft: Scat Nodular Iron
- Balance: External rear, internal front
- Rods: Scat 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 198 / Exhaust 210
- Cam Lift: Intake .435" / Exhaust .462"
- Lobe Separation Angle: 116lsa
- Timing Chain: Double roller
Cylinder Head Information:
- Cylinder Heads: OE TBI cast iron
- Combustion Chamber: 67cc
- Valve Size: 1.94" Intake / 1.50" Exhaust
- Rocker Arms: Stamped steel 1.5
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
Notes: Engine is meant for 1987-1995 Chevy Trucks with a 350 TBI engine. ECM needs a chip burned to run properly.
Upgrade your late '80s to mid-'90s GM truck or SUV with the reliable power of the ATK HP Crate Engines 1987–1995 Small Block Chevy TBI 383ci / 320HP / 395TQ. Built specifically for throttle body injection setups, this engine delivers the low-end torque and everyday drivability that performance enthusiasts and hardworking truck owners demand.
This 383 TBI crate engine is based on a 350ci block and stroked to 383 cubic inches, delivering 320 horsepower and 395 lb-ft of torque—ideal for towing, off-roading, or spirited street driving. It's designed to work seamlessly with your factory TBI system, making it a drop-in upgrade for GM vehicles running throttle body injection from 1987 to 1995.
Featuring high-quality internals like hypereutectic pistons, a performance camshaft, and iron Vortec-style heads, this 383 stroker TBI crate motor provides a significant boost over stock while maintaining reliability and compatibility with factory accessories and electronics.
Each engine is precision-assembled and dyno-tested by ATK to ensure it performs right out of the crate. Whether you're replacing a tired stock engine or building a better-than-OEM setup, this crate engine delivers proven durability and enhanced power.
If you're looking for a 383 TBI crate engine that blends plug-and-play convenience with upgraded performance, ATK delivers the perfect solution for your classic Chevy truck or SUV. Built to work. Built to last. Built to perform.