ATK GM 350 390 HP HP89M Stage 2 Mid-Dress Performance

Description

Complex top end assembly requires the ATK GM 350 390 HP HP89M Stage 2 Mid-Dress Performance and its pre-installed induction hardware. Maintain consistent power delivery during demanding weekend car shows. This build utilizes an externally balanced architecture to ensure smooth power transfer effortlessly.

Key Features of ATK GM 350 390 HP HP89M

• Block Material: Cast iron Chevy Small Block establishes a highly rigid foundation to prevent structural flexing under heavy street loads.
• Cylinder Heads: Premium cylinder castings provide excellent durability and thermal retention for consistent high-performance combustion.
• Induction System: The pre-installed carbureted intake manifold simplifies top-end assembly and provides immediate air delivery.
• Ignition System: The included distributor delivers consistent high-voltage spark to prevent misfires under heavy load.
• Compression Ratio: A pump-gas friendly 10.0:1 compression ratio allows for safe and reliable daily street driving.

Component Breakdown: Mid-Dress Performance Long Block

This partially assembled performance engine accelerates your project by including major induction and ignition hardware pre-installed.

• A matched carbureted intake manifold pairs with the included distributor and harmonic balancer to simplify front drive integration immediately out of the crate.
• Heavy duty cylinder heads resist thermal fatigue while the pre-installed oil pan and timing cover streamline the bottom end installation securely.

Vehicle Fitment & Compatibility Matrix

Designed for classic Chevrolet platforms this mid-dress engine drops effortlessly into vintage chassis. Sourcing one of our custom built Chevy replacement engines bypasses complex machine shop delays.

• Fits 1967-1981 Chevrolet Camaro models replacing tired small blocks perfectly.
• Fits 1973-1987 Chevrolet C10 pickup trucks looking for aggressive towing and street power.
• Fits 1964-1972 Chevrolet Chevelle platforms seeking massive low end torque upgrades.
• Fits 1968-1974 Chevrolet Nova chassis acting as a direct fit performance replacement.

Fuel & Ignition System Requirements

Supporting modifications must be calibrated precisely to feed this carbureted engine block efficiently.

• A high flow carburetor is required to supply the intake manifold while utilizing 91 Octane premium pump gas prevents pre-ignition under load.
• The included distributor mandates a direct twelve volt ignition source bypassing factory resistor wires to guarantee a powerful spark.

Installation, Break-In Oil & Priming Instructions

Professional mechanical preparation separates a successful engine build from a catastrophic premature failure.

• Fill the crankcase with a high zinc break in oil before manually priming the oil system with a dedicated priming tool until pressure is verified.
• Perform a varied RPM heat cycle before changing the oil and driving conservatively for the first 500 miles.

USA Warranty, Emissions & Logistics

Securing this performance upgrade involves strict adherence to federal emissions regulations and proper installation practices.

• Backed by a strict 1-Year manufacturer warranty this package demands documented professional installation to qualify for assembly defect guarantees.
• Carrying a Race Use Only designation this crate ships via LTL freight carrier and requires a signature alongside liftgate capabilities upon delivery.