ATK GM 489 Stroker 565 HP HP411PM Stage 2 Performance

Description

The pre-installed carbureted intake system on the ATK GM 489 Stroker 565 HP HP411PM Stage 2 Performance accelerates classic muscle car restomod projects. Command massive low-end torque during weekend highway cruises. This build utilizes premium aluminum cylinder heads and a hydraulic roller valvetrain to deliver five hundred sixty-five horsepower instantly.

Key Features of ATK GM 489 Stroker 565 HP HP411PM

• Cast Iron Chevy Big Block Block: Secures the rotating assembly with maximum clamping force to prevent main cap walk under heavy torque loads.
• Aluminum Cylinder Heads: Maximizes airflow velocity into the combustion chamber to deliver massive mid-range horsepower.
• Assembled Dual-Plane Intake Manifold: Promotes equal fuel distribution to prevent lean conditions in demanding street and strip environments.
• Hydraulic Roller Camshaft: Optimizes valve timing events to produce an aggressive idle and immediate throttle response on the street.
• HEI Distributor: Delivers consistent high-voltage spark to prevent high-RPM misfires under load.

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 aluminum cylinder heads resist thermal fatigue while the pre-installed oil pan and water pump streamline the bottom end installation securely.

Vehicle Fitment & Compatibility Matrix

Designed for classic Chevrolet platforms this mid-dress big block drops effortlessly into vintage chassis. Sourcing one of our heavy-duty Chevy stroker crate engines bypasses complex machine shop delays.

• Fits 1970-1972 Chevrolet Chevelle models replacing tired factory big blocks perfectly.
• Fits 1968-1972 Chevrolet El Camino platforms seeking massive low end torque upgrades.
• Fits 1973-1987 Chevrolet C10 pickup trucks looking for aggressive towing and street power.
• Fits classic Chevrolet Corvette models replacing tired engines with a fresh aluminum-headed block.

Fuel & Ignition System Requirements

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

• A high flow 750 CFM 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.