What is the compression ratio with these pistons?

These pistons feature a -4.9cc dish volume, which, when combined with the other specified engine dimensions (4.030" bore, 3.480" stroke, 5.700" rod), results in a 10.4:1 compression ratio.

Are these pistons suitable for daily driving on pump gas?

A 10.4:1 compression ratio is generally considered a good balance for performance builds and can often be run on premium pump gas. However, proper engine tuning is crucial to prevent detonation, especially in a performance application.

What does 'press-fit pin' mean for installation?

A press-fit pin design means the wrist pin is installed with a tight interference fit into the piston and connecting rod. This requires specific procedures and tools for installation and removal, ensuring a very secure connection compared to floating pins.

Mahle Forged Piston Set 930127830 - GM 604 Crate Engine

Name: Mahle MS Piston Set GM 604 355ci 4.03in Bore 3.48in Stk 5.7in Rod 0.927 Pin -5cc 10.5 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-gm-604-355ci-4-03in-bore-3-48in-stk-5-7in-rod-0-927-pi-t14-29542
Price: 681.15 USD
Availability: BackOrder

Mahle MS Piston Set GM 604 355ci 4.03in Bore 3.48in Stk 5.7in Rod 0.927 Pin -5cc 10.5 CR Set of 8

$681.15

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Mahle forged piston set for GM 604 crate engines. 4.030" bore, 3.480" stroke, 10.4 CR.

Key Features

Set of 8 forged pistons for GM 604 crate engines.
Designed for 355 cubic inch (355cid) Chevrolet Small Block engines.
Features a 4.030 inch bore and a -4.9cc dish volume.
Works with a 3.480 inch stroke and 5.700 inch connecting rods.
Results in a 10.4:1 compression ratio.
Uses a 0.927 inch wrist pin diameter.

This piston set is designed for GM 604 crate engines and Chevrolet Small Block 355 cubic inch applications. Not CARB approved; cannot ship to California.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Product Details

Mahle is well-known for making solid engine components, and this forged piston set is a great example of their work for GM 604 crate engines. If you're rebuilding or upgrading your 355 cubic inch small block, these pistons are designed as a direct replacement that can handle more power than stock cast pistons. They are built with a press-fit pin design, which is common for performance applications and ensures a strong connection between the piston and connecting rod.

These pistons feature a 4.030-inch bore and are designed to work with a 3.480-inch stroke and a 5.700-inch connecting rod. The -4.9cc dish volume combined with the other engine dimensions results in a 10.4:1 compression ratio, which is a good balance for performance and pump gas compatibility in many builds. Each piston weighs in at 561 grams, contributing to a well-balanced rotating assembly. The 0.927-inch pin diameter is standard for many performance connecting rods.

This set includes all eight pistons needed for a V8 engine. Please note that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures.