Gift CardContactAbout
0 My Cart

Your cart is currently empty.

Continue shopping
Total: $0.00
View cart
Toggle menu
0
  • Home
  • Mahle MS Piston Set for GM LS 403ci with 4.005-inch Bore and 4-inch Stroke
Sold out
Mahle MS Piston Set for GM LS 403ci with 4.005-inch Bore and 4-inch Stroke
Mahle MS Piston Set for GM LS 403ci with 4.005-inch Bore and 4-inch Stroke
Mahle MS Piston Set for GM LS 403ci with 4.005-inch Bore and 4-inch Stroke
Mahle MS Piston Set for GM LS 403ci with 4.005-inch Bore and 4-inch Stroke
Mahle MS Piston Set for GM LS 403ci with 4.005-inch Bore and 4-inch Stroke
Mahle MS Piston Set for GM LS 403ci with 4.005-inch Bore and 4-inch Stroke
Load image into Gallery viewer, Mahle MS Piston Set for GM LS 403ci with 4.005-inch Bore and 4-inch Stroke
Load image into Gallery viewer, Mahle MS Piston Set for GM LS 403ci with 4.005-inch Bore and 4-inch Stroke
Load image into Gallery viewer, Mahle MS Piston Set for GM LS 403ci with 4.005-inch Bore and 4-inch Stroke
Load image into Gallery viewer, Mahle MS Piston Set for GM LS 403ci with 4.005-inch Bore and 4-inch Stroke
Load image into Gallery viewer, Mahle MS Piston Set for GM LS 403ci with 4.005-inch Bore and 4-inch Stroke
Load image into Gallery viewer, Mahle MS Piston Set for GM LS 403ci with 4.005-inch Bore and 4-inch Stroke

Have Questions?

(425) 295-1665 Ask an Experts

  • Trusted by Racers

    Professional-grade parts used trackside.

  • Real Support, Real People

    Expert help during business hours.

  • Secure Shopping

    Encrypted checkout & trusted payments.

  • Fast U.S. Shipping

    Orders ship quickly from regional warehouses.

Mahle MS Piston Set for GM LS 403ci with 4.005-inch Bore and 4-inch Stroke

Mahle
mhl930218105
Out of stock
Engine
$765.97
The Mahle MS Piston Set for GM LS engines offers a reliable solution for high-performance applications,...
Mahle MS Piston Set for GM LS 403ci with 4.005-inch Bore and 4-inch Stroke
Description

The Mahle MS Piston Set for GM LS engines offers a reliable solution for high-performance applications, specifically designed for 403 cubic inch (CID) engines with cathedral port heads. Crafted with precision, these pistons feature a 4.005-inch bore and a 4-inch stroke, making them suitable for LS1, LS2, and LS6 style engines. Each piston is engineered with a net compression ratio of 11.7:1, optimizing power output and efficiency. Constructed from durable 4032 aluminum, these pistons are lightweight yet robust, ensuring durability under demanding conditions. The set includes eight pistons, each weighing approximately 405 grams, with a pin diameter of 0.927 inches and a rod length of 6.125 inches. Features such as a -4.0cc dish volume contribute to achieving the desired compression ratio while maintaining engine reliability.

Designed for performance enthusiasts and professional engine builders, these Mahle pistons are compatible with flat top configurations for LS 5.7L and 6.0L engines. The set is not carburetor approved and requires carb acknowledgment during installation, aligning with specific automotive regulations. While not intended for air freight, these pistons are ideal for ground shipping and installation in custom or rebuild projects. They are manufactured with Prop 65 compliance, ensuring safety and environmental standards are met. With a focus on quality and performance, the Mahle MS Piston Set provides a solid foundation for building powerful, reliable LS-based engines tailored to your vehicle’s needs.

Features:

  • Designed for GM LS 403 cubic inch engines with cathedral port heads
  • Bore: 4.005 inches, Stroke: 4 inches, Rod: 6.125 inches
  • Made from durable 4032 aluminum for strength and lightweight performance
  • Net compression ratio of 11.7:1 for optimal power and efficiency
  • Includes eight pistons with a -4.0cc dish volume and 0.927-inch wrist pin
  • Compatible with flat top LS 5.7L and 6.0L engine configurations
  • Not carburetor approved; requires carb acknowledgment during installation
  • Prop 65 compliant for safety and environmental standards
Read More
Read Less

Shipping

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.

Returns

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).

Your cart

×