What does the 0.040 inch sizing mean for these pistons?

The 0.040 inch sizing indicates that these pistons are slightly larger than the original factory pistons. This is common when rebuilding an engine where the cylinder walls have worn beyond their original specifications and have been bored out to match the new piston size.

Are these pistons ready to install right out of the box?

Yes, these Mahle OE pistons come with the piston pin and clips already mounted. This means they are ready for installation into your engine block after you've prepared the cylinders and connecting rods.

What is the benefit of compensated ring grooves?

Compensated ring grooves help ensure that the piston rings are properly loaded and seal effectively against the cylinder wall. This is important for maintaining good oil control, reducing blow-by, and contributing to overall engine efficiency.

Mahle OE Piston Set 2241658040 - GMC 250 Eng 1966-84 .040

Name: Mahle OE GMC Pass & Trk 250 Eng 1966-84 .040 Piston Set (Set of 6)
Brand: Mahle OE
SKU: mahle-oe-mahle-oe-gmc-pass-trk-250-eng-1966-84-040-piston-set-set-of-6-t14-53571
Price: 153.24 USD
Availability: BackOrder

Mahle OE GMC Pass & Trk 250 Eng 1966-84 .040 Piston Set (Set of 6)

$153.24

On Backorder

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

Mahle OE cast piston set for GMC 250ci engines 1966-1984. Set of 6 pistons, 0.040 inch oversize. Part# 2241658040.

Key Features

Fits 1966-1984 GMC and Chevrolet 250ci inline-six engines.
Set includes six cast pistons, 0.040 inch oversize.
OE quality construction from Mahle, a leading original equipment manufacturer.
Compensated ring grooves ensure proper ring loading and oil control.
Expansion-controlled design reduces engine noise and wear.
Pistons come with pin and clips mounted for easier installation.

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Will this fit your vehicle?

Product Details

If you're rebuilding the engine in your classic GMC or Chevrolet truck, or even a Camaro or Chevelle from the late 60s through the early 80s, a solid set of pistons is crucial. This Mahle OE cast piston set is made to fit the 250 cubic inch inline-six engine found in a wide range of vehicles, including models like the Chevrolet C10 Pickup, GMC G10 Van, and Checker Marathon from 1966 to 1984. These pistons are 0.040 inches larger than stock, designed to help restore compression and performance in an engine that may have worn cylinders.

Mahle is one of the world's largest manufacturers of original equipment pistons, so you know you're getting parts that meet the same standards as what came from the factory. They feature compensated ring grooves to ensure proper ring loading and oil control, which helps reduce engine noise and emissions. The expansion-controlled design means they fit with minimal clearance, further contributing to a quieter, more efficient engine. This set comes with six pistons, ready for installation with the piston pin and clips already mounted, saving you a step during your rebuild.