ATK GM 350 390 HP HP89 Stage 1 Aluminum Head Engine

Description

The restrictive factory intake tract requires the ATK GM 350 390 HP HP89 Stage 1 Aluminum Head Engine and its advanced aluminum port designs. Command aggressive highway passing power during demanding performance runs. This build utilizes a precision machined block and lightweight heads to deliver three hundred ninety horsepower smoothly.

Key Features of ATK GM 350 390 HP HP89

• Block Material: Cast iron Chevy Small Block establishes a highly rigid foundation to prevent structural flexing under extreme street loads.
• Cylinder Heads: High-performance aluminum cylinder heads increase volumetric efficiency to feed the 5.7-liter displacement effortlessly.
• Compression Ratio: A 10.0:1 compression ratio optimizes power output while remaining completely safe for premium pump gas.
• Bore & Stroke: The classic 350 cubic inch internal geometry delivers a broad torque curve perfect for heavy street applications.
• Camshaft Style: A hydraulic roller camshaft reduces valvetrain friction to deliver a classic muscle car idle and predictable mid-range power.

Component Breakdown: Base Long Block Configuration

This assembled base long block provides a formidable small block foundation for high performance engine swaps and direct repowers.

• A precision machined cast iron block houses a robust hydraulic roller camshaft designed to deliver a massive torque curve for heavy street applications.
• Lightweight aluminum cylinder heads improve overall thermal efficiency while thick internal bearings maintain steady oil pressure under load.

Vehicle Fitment & Compatibility Matrix

Engineered to drop seamlessly into classic Chevrolet engine bays this 5.7L block aligns perfectly with standard motor mounts. Sourcing one of our heavy-duty Chevy replacement engines modernizes the powertrain of your classic vehicle instantly.

• Fits 1967-1981 Chevrolet Camaro models looking for an authentic 350 power upgrade.
• Fits 1973-1987 Chevrolet C10 pickup trucks requiring a heavy duty replacement block.
• Fits 1964-1972 Chevrolet Chevelle platforms needing robust low end towing torque.
• Fits 1968-1974 Chevrolet Nova applications seeking a direct fit replacement.

Fuel & Ignition System Requirements

Feeding this classic small block engine demands proper fuel tuning and reliable ignition components.

• An upgraded mechanical or electronic fuel pump is required to supply your carburetor while utilizing 91 Octane premium pump gas prevents pre-ignition.
• Heavy duty spark plug wires must be utilized alongside an aftermarket HEI distributor to maintain a powerful spark across the RPM band.

Installation, Break-In Oil & Priming Instructions

Proper initial startup procedures ensure the longevity of the hydraulic roller lifters and internal bearings.

• Transfer your existing intake manifold using fresh gaskets before manually priming the oil system with a dedicated priming tool until pressure is verified.
• Fill the crankcase with a high zinc break in oil and perform a varied RPM heat cycle before driving conservatively for the first 500 miles.

USA Warranty, Emissions & Logistics

Investing in this ATK High Performance crate engine secures peace of mind through comprehensive manufacturer backing.

• Backed by a strict 1-Year manufacturer warranty this engine provides excellent protection against internal manufacturing defects when installed properly.
• This assembly is not legal for sale or use on pollution controlled motor vehicles in California and ships securely via LTL freight.