ATK HP89CPOL — Chevy 350 Crate Engine 390 HP Stage 3 (Polished)

Awesome performance and awesome looks — with everything included. The ATK HP89CPOL is the ultimate Chevy 350 crate engine: 390 horsepower and 420 lb-ft of torque from a hand-assembled, precision-balanced Stage 3 long block, topped with polished aluminum heads and dressed with a carburetor, intake manifold, distributor, water pump and oil pan. Nearly everything you need is in the crate — add fuel, exhaust and ignition power and fire it up. Street rod, muscle car or truck — the HP89CPOL is ready to tear up the street or strip. Shipped fast across Europe from NH Race Engine.

Why Choose the ATK HP89CPOL?

Most Chevy 350 crate engine listings hide the real cost: the block is cheap, but by the time you’ve added heads, cam, intake, carburetor, distributor, water pump, oil pan, balancer and gaskets, you’ve doubled the price — and spent weeks sourcing parts. The HP89CPOL collapses all of that into one box: a 390 HP Stage 3 long block with every major external component already installed.

Under the polish is serious engineering. ATK starts with a handpicked, remanufactured 1996–2000 OE roller block with 4-bolt mains and a 1-piece rear seal, bores it to 4.040 inches and fills it with hypereutectic pistons for a street-friendly 10.0:1 compression ratio. A hydraulic roller cam with .528/.536-inch lift and 220/224 degrees duration @ .050 delivers a lopey idle, instant throttle response and power across the entire RPM range. ATK aluminum heads with 2.020/1.600-inch valves flow the mixture that makes 390 horsepower. Every engine is hand-assembled and balanced before leaving the facility — and backed by ATK’s 3-year warranty.

Key Features & Benefits

• 390 HP / 420 lb-ft: Genuine dyno-proven Stage 3 performance from a small block Chevy — enough to transform a street rod, muscle car or classic truck.
• Complete Package: Carburetor, intake manifold, distributor, plug wires, plugs, valve covers, timing cover and set, oil pan, oil pump, pickup tube, water pump, front damper and air cleaner all included. Unlike most crate engines, the HP89CPOL needs almost nothing added.
• Premium OE Block: Handpicked, remanufactured 1996–2000 GM roller block with 4-bolt mains and 1-piece rear seal — the strongest factory 350 architecture.
• 10.0:1 Compression: Perfect for pump gasoline (91–93 octane recommended) — no race fuel, no detonation worries, no compromises for street use.
• Hydraulic Roller Cam: .528 int./.536 exh. lift, 220/224 duration @ .050 — strong idle character with modern roller reliability and low maintenance.
• ATK Aluminum Heads: 2.020/1.600-inch valves in polished aluminum — superior flow, lighter valvetrain, and show-quality looks straight from the crate.
• Hypereutectic Pistons & OE Internals: Durable hypereutectic pistons on the OE crankshaft and connecting rods — proven components matched for street reliability.
• Hand-Assembled & Balanced: Every engine is assembled and balanced by technicians — not mass-production lines — for smooth, reliable high-RPM operation.
• Polished Dress-Up Package: Polished valve covers and aluminum heads make this the centerpiece of any engine bay — no extra chrome spending required.
• 3-Year ATK Warranty: Industry-leading warranty coverage for complete peace of mind.

What’s Included — Almost Everything

Technical Specifications

HP89CPOL vs. Typical Bare Crate Engines

Ideal Applications

• Street Rods & Hot Rods: Traditional Ford and Chevy builds needing reliable, turn-key power with show-quality looks — the polished dress-up package needs no extra chrome.
• Muscle Cars: Camaro, Chevelle, Nova, GTO-era GM restomods — 390 HP transforms the driving experience while staying streetable.
• Classic Trucks: C10s, K5 Blazers, square bodies — effortless torque for cruising or towing.
• Kit Cars & Replicas: Cobras, roadsters and kit builds where a complete, tested engine package saves months of assembly time.

Frequently Asked Questions

Is the ATK HP89CPOL really ready to run out of the crate?

Nearly — it includes the carburetor, intake, distributor, ignition, water pump, oil pan, oil pump, valve covers, timing components, balancer and air cleaner. You supply fuel lines, an exhaust system, a flexplate or flywheel matched to your transmission, and engine mounts.

What fuel does the HP89CPOL need?

Regular premium pump gasoline — 91–93 octane is recommended. The 10.0:1 compression ratio is designed for street fuel, not race gas.

What transmission does it fit?

Any GM-pattern transmission — TH350, TH400, 700R4/4L60, T-5, T-56 and others. The engine uses the standard small-block Chevy bellhousing pattern. Order the correct flexplate (automatic) or flywheel (manual) separately.

Is this engine street legal in Europe?

This is a carbureted performance engine intended for vehicle engine changes and off-road or classic vehicle use. Emissions requirements vary by country — check your national regulations for engine changes in classics, hot rods and kit cars.

Does it come with a warranty?

Yes — ATK backs the HP89CPOL with a 3-year warranty. Full warranty terms are available on request.

Recommended Companion Products

• Flexplate — automatic transmission
• Flywheel — manual transmission
• Engine mounts & hardware
• Headers & exhaust systems for small block Chevy
• Break-in oil & assembly lubricant
• Electric fuel pump & regulator kit
• 350 V8 engines — full category

What Does It Fit?

Condition & Pre-Delivery Inspection

• Crate integrity documented on arrival — no hidden transit damage reaches you
• Visual inspection of all dress components: intake, carb, distributor, pump, balancer
• Compression spot-check across all eight cylinders
• ATK’s own first-start rules (from their technical documentation): fuel pressure 5–6 PSI (a regulator if your pump exceeds it), iron distributor gear only — ATK cams are nodular-iron core, so bronze or steel gears destroy them — and a standard fuel-pump pushrod (Pioneer FPR-1936 recommended, never brass)
• Break-in: vary rpm for the first 500 miles; oil and filter change after break-in; full procedure in our installation guides
• Register your warranty on our warranty registration page

Recommended Companion Products

• The milder sibling: ATK HP89M Stage 2 Mid Dress 350 — same family, less dress [LINK IN CMS to HP89M page]
• More displacement: [ATK HP101C 383 Stroker – 470 HP] · [ATK HP33C 383 – 390 HP] · EFI options: [HP36C-EFI] · [HP94C-EFI] [LINKS IN CMS]
• BluePrint alternatives: [BluePrint 383 Stroker 436 HP] · [BluePrint 383 Low Profile] [LINKS WHEN LIVE]
• Read our Small Block Chevy Buyer’s Guide before you decide on displacement
• The gearbox behind it: transmission rebuilds · dyno verification

Shipping & Delivery

Order Your ATK HP89CPOL 350 Crate Engine