Built for the demands of circle track competition and high-rpm abuse, the MAHLE forged pistons are engineered specifically for GM 604 crate engines. Manufactured from premium forged aluminum for exceptional strength and durability, these pistons deliver the reliability racers demand when every lap counts. Featuring a press-fit pin design and MAHLE's renowned quality standards, they're the perfect choice for freshening up a sealed crate engine or building a dependable race-ready powerplant.

Key Features & Benefits

Forged aluminum construction provides superior strength over cast pistons for demanding racing applications.
Designed specifically for GM 604 crate engines for proper fit and performance.
Press-fit wrist pin configuration delivers reliable operation in high-rpm environments.
Lightweight design helps reduce reciprocating mass for improved engine response.
Precision-machined for consistent cylinder sealing and dependable performance.
Engineered to withstand the heat and stress of circle track and endurance racing.
Manufactured by MAHLE, a trusted leader in OE and motorsports engine components.
Ideal for crate engine rebuilds, refreshes, and race-prep maintenance.
Built to maintain durability under sustained competition use.
Race-proven design helps maximize reliability when the green flag drops.

CARB Warning

For race/ off road use or for use on pre-1966 vehicles.

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

CA Prop 65

CARB warning

Specifications

KEY SPECS
Brand	MAHLE
Piston Style	Flat Top w/ 2 valve reliefs
Piston Material	Forged Aluminum
Wrist Pin Included	Yes
Wrist Pin Style	Press-Fit

GENERAL
Piston Diameter	Select Size to see
Dome Height	-4.9cc
Stroke	3.480
Connecting Rod Length	5.700"
Piston Weight	Select Size to see
Wrist Pin Diameter	0.927
Wrist Pin Weight	118g
Piston Rings Included	Select Size to see
Top Ring Thickness	2.0 mm
Second Ring Thickness	1.5 mm
Oil Ring Thickness	4.0 mm
Sold in Quantity	Set
Engine Displacement	Select Size to see
Bore Size	4.00
Compression Height	1.559
Wrist Pin Retainers Included

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