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Buick 401 Nailhead Pistons
Inspected & Documented Condition notes recorded before palletizing.
30-Day Startup Warranty Covers block, heads and internal moving components.
In Stock & Ready to Freight Engine Components

Buick 401 Nailhead Pistons

Condition: New
Regular price $332.10 Save $99.63
Sale price $232.47
Sale price ends Mon Nov 30, 11:59 PM PT
+ freight from $185.00, insured LTL, priced by delivery zone (rates)
From $417.47 delivered
  • Palletized and heavy shrink-wrapped for freight
  • LTL carrier delivery with optional liftgate service
  • Ships in 1–2 business days from Los Angeles, CA
  • Transit typically 3–14 business days, continental US
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Details & Inspection Notes

This piston set is a direct replacement for the '59-'66 Buick 401 Nailhead, cast at a 4.1875-inch bore from a high-silicon aluminum alloy and finished on modern CNC equipment rather than older tooling.

What makes the set

Every set is precision balanced and weight-matched, with no more than an 8-gram spread between the lightest and heaviest piston, which matters for a smooth-running V8 at higher RPM. The rings supplied are a cast top ring paired with a cast second ring.

Before you order

Confirm your block is a genuine 401 Nailhead from this model-year range and that your bore matches 4.1875 inches before ordering, since piston sets like this are machined to a specific bore rather than a universal size. A qualified engine builder should handle fitting and ring gap checks during assembly.

Common questions

What alloy are these pistons? High-silicon A-332 cast aluminum, machined on CNC equipment.

How closely matched is the set? Within 8 grams from the lightest piston to the heaviest.

Startup & Installation Checklist

  • Inspect all external gaskets, seals, spark plugs and timing components prior to installation.
  • Refill engine oil, transmission gear oil and coolant to manufacturer-specified capacities before initial cranking.
  • Prime the lubrication system and verify ECU wiring pinouts, sensors, and ground connections.
  • Startup warranty covers internal lubricated components, cylinder heads, and engine block for 30 days from delivery.

Full terms: 30-day startup warranty · returns

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