ATK GM 350 345 HP HP98C Stage 3 Complete Carbureted
Down the drag strip this complete ATK GM 350 345HP provides consistent dial-in times. Features high-quality iron heads and a 9.1:1 compression squeeze. Tune the pre-installed carburetor. Drop the clutch.
- Ready to run carbureted intake saves wrenching hours
- Roller cam technology eliminates flat tappet wear issues
- One piece rear seal prevents clutch slippage from leaks
- Assembled with starter-friendly 9.1:1 compression ratio
Description
The classic Chevrolet powertrain requires the ATK GM 350 345 HP HP98C Stage 3 Complete Carbureted and its fully dressed induction system. Command aggressive highway passing power during weekend cruise events. This build utilizes a complete turn-key architecture to output three hundred forty-five horsepower smoothly.
Key Features of ATK GM 350 345 HP HP98C
- Block Material: Cast iron Chevy Small Block ensures maximum structural integrity under the torque loads generated by 350 cubic inches.
- Cylinder Heads: High-performance cast iron cylinder heads maximize airflow capacity to generate reliable street performance.
- Induction System: The pre-installed carbureted intake manifold simplifies top-end assembly and provides immediate air delivery.
- Ignition System: The included HEI distributor delivers consistent high-voltage spark to prevent misfires under heavy load.
- Compression Ratio: A pump-gas friendly 9.1:1 compression ratio allows for safe and reliable daily street driving.
Component Breakdown: Turn-Key Complete Stage 3 Engine
This complete engine package arrives fully dressed from the intake manifold to the oil pan to eliminate sourcing individual modern accessories.
- A high flow carburetor sits atop a matched intake manifold while the included distributor and spark plug wires ensure immediate ignition out of the crate.
- A long style water pump and harmonic balancer complete the front drive assembly allowing builders to focus on chassis installation.
Vehicle Fitment & Compatibility Matrix
Designed for classic Chevrolet and GMC restomod projects this complete engine drops perfectly into vintage chassis. Sourcing one of our turn-key Chevy 350 crate engines modernizes your classic restoration instantly.
- Fits 1967-1981 Chevrolet Camaro models looking for an instant powertrain swap.
- Fits 1973-1987 Chevrolet C10 pickup trucks requiring a reliable and modern carbureted setup.
- Fits 1964-1972 Chevrolet Chevelle applications needing a reliable V8 foundation.
- Fits 1968-1974 Chevrolet Nova conversions requiring a 350 drop-in setup.
Fuel & Ignition System Requirements
Supplying adequate fuel pressure to this fully dressed small block platform requires capable supporting hardware.
- An upgraded high pressure mechanical or electronic fuel pump is required to supply the carburetor while utilizing 91 Octane premium pump gas prevents pre-ignition under load.
- The pre-installed distributor and spark plug wires mandate a clean twelve volt power source directly from the battery to guarantee a powerful spark.
Installation, Break-In Oil & Priming Instructions
Executing a flawless installation demands meticulous attention to fluid dynamics and proper heat cycling.
- Before firing the engine builders must utilize a specialized tool to prime the oiling system manually ensuring fluid reaches the upper valvetrain completely.
- Fill the engine with a premium high zinc break in oil and perform a varied RPM heat cycle before driving conservatively for the first 500 miles.
USA Warranty, Emissions & Logistics
Protecting your investment requires understanding the specific logistics and legal compliance associated with this purchase.
- Backed by a strict 1-Year manufacturer warranty this complete long block offers extensive coverage against assembly defects when documented installation procedures are followed.
- This non-emissions compliant engine is designated for pre-emissions or off road Race Use Only and requires freight delivery to a commercial address with a forklift.
ATK High Performance HP98C GM 350 345 HP Stage 3 Long Block Specs
| Brand | ATK High Performance Engines |
| Part Type | Crate Engines |
| Product Line | ATK High Performance GM 350 345 HP Stage 3 Long Block Crate Engines |
| UPC | 653517417016 |
| Crate Engine Family | Chevy Small Block |
| Engine Displacement | 5.7L / 350 |
| Compression Ratio | 9.1:1 |
| Cylinder Head Material | Cast Iron |
| Engine Block Material | Cast Iron |
| Assembled | Yes |
| Engine Balance | Internal/External |
| Cam Style | Hydraulic roller, OE roller |
| Rear Main Seal Style | 1-piece |
| Intake Manifold Included | Yes |
| Intake Manifold Style | Carbureted |
| Cylinder Heads Included | Yes |
| Carburetor Included | Yes |
| Throttle Body Included | No |
| Distributor Included | Yes |
| Oil Pan Included | Yes |
| Valve Covers Included | Yes |
| Timing Cover Included | Yes |
| Water Pump Included | Yes |
| Water Pump Style | Long |
| Harmonic Balancer Included | Yes |
| Flexplate Included | No |
| Flywheel Included | No |
| Air Cleaner Included | No |
| Spark Plugs Included | Yes |
| Spark Plug Wires Included | Yes |
| Computer Included | No |
| Wiring Harness Included | No |
| Supercharger Included | No |
| Warranty Info | 1 Year |












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