fits make: Buick.

( Brand: Zollner ), ( Manufacturer Part Number: Z9402 ), ( Part Type: Piston ), ( Country/region Of Manufacture: United States )
The Z9402 NOs Set Zollner Pistons 030 for the Buick Nailhead 401 engine is a high-quality replacement option for your vehicle's worn-out pistons. These pistons are manufactured by Zollner, a renowned name in the automotive industry, known for their precision and durability.
The Z9402 set includes four pistons, each designed to perfectly fit into the engine's cylinders. They are made from forged aluminum, a material that provides excellent strength and heat resistance. This ensures that the pistons can withstand the high temperatures and pressures generated during engine operation, extending the lifespan of your engine.
Each piston in the set features a compression ratio of 8.5:1, which is ideal for the Buick Nailhead 401 engine. The piston skirts are honed to a mirror finish, reducing friction with the cylinder walls and improving engine efficiency. The piston tops are equipped with a multi-ring design, which includes two compression rings, one oil control ring, and one wear ring. This design ensures proper sealing of the combustion chamber, preventing oil leakage and combustion gas blowby.
The piston rings are made from high-temperature, low-tension steel, ensuring a long-lasting performance. The top ring's groove is designed with a chamfered edge, which promotes easy ring installation and reduces the chance of ring damage.
The Z9402 NOs Set Zollner Pistons 030 for the Buick Nailhead 401 engine is a reliable choice for any DIY enthusiast or professional mechanic looking for a high-performance piston set. With their precise fit, excellent heat resistance, and durable design, these pistons will help keep your engine running smoothly and efficiently for years to come.
Pros of buying Z9402 NOS Set Zollner Pistons 030 for Buick Nailhead 401:1. New and Original: These pistons are new old stock (NOS), meaning they are original parts that have been stored for a long time. This ensures that they are of high quality and will fit your engine perfectly.
2. Improved Performance: Zollner pistons are known for their superior strength and durability, which can help improve the performance of your engine. They are designed to handle high compression ratios and can increase horsepower and torque.
3. Availability: NOS parts are often harder to find, but with Zollner, you can be sure that they are easily available.
Cons of buying Z9402 NOS Set Zollner Pistons 030 for Buick Nailhead 401:1. Price: NOS parts can be more expensive than new or used parts. This is because they are original and hard to find, which increases their demand and price.
2. Installation: Installing NOS pistons can be more complex than installing new or used parts. This is because they may require specific tools or techniques to install correctly.
3. Compatibility: While Zollner pistons are designed to fit Buick Nailhead 401 engines, it's important to double-check the compatibility before purchasing.
Conclusion:If you're looking for high-quality pistons for your Buick Nailhead 401 engine and are willing to pay a premium for original NOS parts, then Z9402 NOS Set Zollner Pistons 030 is a great option. However, be prepared for the additional cost and complexity of installation. If you're on a budget or prefer a simpler installation process, you may want to consider new or used pistons instead.
Recommendation:If you're comfortable with the additional cost and installation complexity, then I would recommend buying Z9402 NOS Set Zollner Pistons 030. They are a high-quality option that can help improve the performance of your engine. However, if you're looking for a more affordable or simpler option, you may want to consider new or used pistons from a reputable manufacturer.
As far I can tell they are for a Buick 401 nailhead engine oversize. Nos set of Zollner Z9402 pistons. It says on the box label they cross with kilovolt call to arrange.
The last photo is a kilovolt catalog. Sales to USA only.