Have Questions?
Professional-grade parts used trackside.
Expert help during business hours.
Encrypted checkout & trusted payments.
Orders ship quickly from regional warehouses.
The Mahle MS Piston Set designed for Chevrolet Small Block engines offers a high-performance solution for 420 cubic inch applications. Featuring a bore diameter of 4.155 inches and a stroke of 3.875 inches, these pistons are engineered for durability and precision. The set includes pistons with a 12.1 compression ratio, optimized for enhanced power output and efficiency. Constructed from strong 4032 aluminum, these pistons are coated with phosphate and Grafal for improved wear resistance and corrosion protection, ensuring long-lasting performance under demanding conditions. The pistons are designed with a 0.927-inch pin and a 6.0-inch connecting rod, providing a reliable fit for high-performance rebuilds and custom builds. This set contains eight pistons, making it suitable for complete engine assembly and rebuild projects that demand quality and consistency. The Mahle brand is renowned for its precision engineering and durability, making these pistons an excellent choice for automotive enthusiasts and professional mechanics alike.
Features:
Order Processing
All orders are processed and shipped within 24 hours of purchase (excluding weekends and holidays).
Orders placed after 3:00 PM EST may ship the following business day.
Shipping Methods
Customers select their preferred shipping method and speed at checkout.
Shipping times are determined by the carrier and cannot be guaranteed by us.
Tracking information will be provided once your order has shipped.
Shipping Coverage
If your package arrives damaged, please notify the delivery driver immediately and contact the shipping carrier to file a claim.
You must report any missing or damaged items within 14 days of delivery.
After this time, we cannot be held responsible for lost or damaged items.
Return Window
You have 30 days from the date of delivery to request a return.
After 30 days, we are unable to accept returns, exchanges, or refund requests.
Eligibility
Items must be returned in their original condition—unused, unwashed, and with all tags and packaging intact.
Certain products may not be eligible for return (e.g., special-order items, customized products, or perishable goods).
Items that have been altered, installed, or modified cannot be returned.
Return Process
Contact our Customer Support team to request a Return Authorization (RMA) before sending items back.
Once your return is approved, you’ll receive instructions on where to send the product.
Customers are responsible for return shipping costs unless the item was defective or incorrect.
Refunds
Refunds are issued to the original payment method once the returned item has been received and inspected.
Please allow 5–10 business days for the refund to appear on your account.
In some cases, a restocking fee may apply (if applicable, this will be disclosed during your return authorization).
