In Stock
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
€332.10
+ freight from €89.00, insured road freight, priced by delivery region
(rates)
From €421.10 delivered
- ISPM 15 heat-treated Euro palletized & weatherproof shrink-wrapped
- Insured European road freight delivery with hydraulic tail-lift service
- Dispatches in 1–2 business days from our UK & European Logistics Centre
- Transit typically 1–3 business days (UK) / 3–6 business days (Continental Europe)
Need a matched transmission, controls or wiring package? Speak with a parts specialist.
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
