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Vehicle Info NeededHP55C High Performance Crate Engine Small Block Chevy 383ci / 500HP / 505TQ
Ships on 09/16/2026
Lowest Price GuaranteeATK Core Return Process
JEGS and ATK appreciate your business and want to ensure that your core return is as smooth as possible.
Please CLICK HERE for ATK Core Return Process
NOTE:
- Core return can be any Small Block Chevy 350ci engine, except 1992-1997 LT1 style engines
Engine Info
- Balancer: Internal balance 8"
- Carburetor: Quick Fuel 750cfm mechanical secondary no choke #793-Q-750
- Distributor: Pro billet (iron gear)
- Exhaust: 1-3/4" Headers
- Firing Order: 18436572
- Flexplate: External balance 168 tooth
- Fuel Pump: Holley Mechanical 110gph #510-12-327-11
- Intake Manifold: Edelbrock Performer RPM Air Gap #350-7501
- Octane: 91+
- Oil: 10W30 (Conventional / Non Synthetic)
- Oil Filter: Wix or K&N
- Spark Plug Gap: .035"
- Spark Plugs: Autotile #417-3923
- Spark Plug Wires: 8mm
- Stall Converter: 2800+
- Timing: 34-36 Degrees
- Water Pump: Weiand Action+ long pump #925-9240
Disclaimer: The parts listed are ATK's recommendations of parts to be used to obtain the power figures listed. Power figures can vary based on parts used by the end user. Some modifications to the vehicle may be required using these and or other aftermarket parts.
Engine Break-In Procedure
Use or break-in oil or conventional (non-synthetic) 10w30 oil with zinc additive for the first 500 miles of operation. Do not drive for long periods at any single speed, always vary your speed. Do not tow a trailer or put other heavy loads on the vehicle. It is best to avoid long periods of idling during this period. Check the engine oil and coolant levels daily.
Engines with flat tappet hydraulic cams only - Run the engine between 2,000 and 2,500 RPM's, with no-load on the engine for the first 30 minutes. Let the engine cool down completely and repeat process 2-3 more times. Do not idle the engine for any extended period at this time, this is critical to break in the camshaft.
At 500 Miles change the engine oil and filter using conventional (non-synthetic) oil with a zinc additive. Check fuel and ignition settings, adjust valves (where applicable). Drive the next 500 miles normally, without high RPM's (below 5000 RPM), hard use, or extended periods of high loading or long periods of idling.
Change the oil and oil filter again at 1,000 miles. Continue using conventional (non-synthetic) oils and zinc additive, until about 4,000 miles. At that point, you may run a quality 10w30 synthetic oil if you choose. Use of oil with zinc or a zinc additive for the life of your engine is recommended.
Emissions Note:
This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.
CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART
High-Performance 383 Stroker for Street/Strip
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. These quality-built engines are offered in three different stages for ease of finishing an engine swap. ATK HP engines feature a 24 month/unlimited mile warranty.
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Bulletproof street/strip engine with a lopey idle, may not work with power brakes or a/c.
Engine Specifications
- Horsepower: 500 hp
- Torque: 505 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 4340 forged
- Balance: External rear, internal front
- Rods: Scat 4340 forged H beam 5.7" with ARP 8740 bolts
- Compression Ratio: 10.2:1
- Pistons: Forged
- Rings: Moly
Camshaft Specs:
- Camshaft: Hydraulic roller
- Cam Duration @ .050": Intake 237 / Exhaust 245
- Cam Lift: Intake .597" / Exhaust .597"
- Lobe Separation Angle: 112lsa
- Timing Chain: Double roller
Cylinder Head Information:
- Cylinder Heads: Dart SHP American Made Aluminum
- Combustion Chamber: 72cc
- Intake Runner: 200cc
- Valve Size: 2.02" Intake / 1.60" Exhaust
- Rocker Arms: Biller aluminum roller rockers 1.6 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
Base Engines
- Short Block
- Camshaft
- Timing Set
- Cylinder Heads
- Valve Covers
- Timing Cover
- Oil Pan
- Oil Pump & Pickup Tube
- Flexplate
Mid Dress Engines
- Consists of Base Engine Build
- Intake Manifold
- Distributor
- Water Pump
- Harmonic Balancer
Complete Engines
- Consists of Mid Dress Engine Build
- Fuel Pump
- Carburetor or EFI
- Spark Plug Wires
- Spark Plugs
Unlock serious street and strip performance with the ATK HP Crate Engines Small Block Chevy 383ci / 500HP / 505TQ—a powerhouse built for enthusiasts who demand big horsepower from a reliable package. Designed for high-performance builds, this crate engine delivers a thrilling 500 horsepower and 505 lb-ft of torque, making it an exceptional upgrade for muscle cars, hot rods, and track-ready street machines.
This 383 stroker is based on a seasoned Chevy small block, professionally machined and assembled with high-quality internals to ensure durability and top-tier performance. It's the perfect choice if you're searching for a 500 hp SBC crate engine that offers both brute force and consistent reliability.
Whether you're chasing ETs at the dragstrip or just want a head-turning cruiser, this build includes premium components such as forged pistons, a high-lift camshaft, aluminum cylinder heads, and a performance intake manifold—all working together to unleash massive power across the RPM range.
Want a hassle-free setup? This engine fits the bill as a 383 stroker 500 hp turn key option, ready to bolt in and roar to life with minimal setup. You can also pair it with a 383 stroker kit 500 hp for a complete drivetrain upgrade.
Backed by ATK's reputation for quality and dyno-tested performance, this crate engine is more than just an upgrade—it's a transformation. Experience raw American muscle with the ATK 383ci 500HP crate engine and give your project the heart it deserves.
Items You Need
![Break-In/Engine Oil Supplement [12 oz. Bottle]](https://www.jegs.com/images/mini_200/500/555/555-28060.jpg)
![Engine Stand [1000 lb. Capacity]](https://www.jegs.com/images/mini_200/500/555/555-80040.jpg)
![Fender Cover with Pocket [23 in. W x 31 1/2 in. L]](https://www.jegs.com/images/mini_200/500/555/555-65010.jpg)
JEGS
Fender Cover with Pocket [23 in. W x 31 1/2 in. L]
Part Number : 555-65010
JEGS
Part Number : 555-65010
