labwork Intake and Exhaust Valves for GM ECOTEC 2.0/2.2/2.4L — Direct-Fit OEM Dimensions Restores Compression

If your ECOTEC engine is showing reduced compression, rough idle, or uneven performance, worn or bent valves are a common cause. These labwork replacement valves are manufactured to match OEM critical dimensions so they fit into the cylinder head like the originals. Before ordering, verify your vehicle’s compatibility and compare old parts to the listed measurements and part numbers.

How do these labwork valves restore engine performance?

Replacing damaged intake and exhaust valves helps re-establish proper cylinder sealing, which improves compression and combustion efficiency. Correct valve geometry also maintains correct valve lift and timing interaction, reducing misfires and idle instability.

• Replaces worn valve faces that allow compression loss
• Restores proper contact with valve seats for improved sealing
• Returns consistent valve lift to match cam profiles

What sizes and part numbers should I expect for fitment confirmation?

The labwork valves come with precise dimensions and OEM-style part references so you can confirm fit before purchase. Compare these numbers with your old parts or service manual to ensure direct compatibility with GM ECOTEC heads.

• Intake valve part number: 12622329
• Exhaust (air-out) valve part number: 12615936
• Intake valve size: head 35.1mm × stem 6mm × length 102.2mm
• Exhaust valve size: head 30.1mm × stem 6mm × length 100.9mm

Which symptoms indicate the valves need replacing?

Valve issues often present as performance and drivability symptoms rather than obvious mechanical failure. If you notice these signs, the valves — or their seats — may be compromised and require inspection or replacement.

• Loss of power or poor acceleration under load
• Hard starting, rough idle, or engine misfires
• Low or uneven cylinder compression readings

What should I check before ordering labwork replacement valves?

To prevent incorrect purchases, always match part numbers and physical dimensions to the components removed from the head. Also confirm the valves’ stem diameter and length to ensure valve guides and springs remain compatible.

• Compare provided part numbers (12622329 and 12615936) with your old valves
• Verify head diameter, stem size (6mm), and overall length measurements
• Inspect valve seats and guides for damage that might require machining

Who this is for: These labwork intake and air-out valves are aimed at DIY mechanics, machine shops, and professional technicians working on GM ECOTEC 2.0L, 2.2L, and 2.4L engines who need accurate, OEM-dimensioned replacement valvetrain components. They are suitable for head rebuilds, valve reseating jobs, and any repair where original valve geometry and fit are required. If you lack the tools for head machining or valve seat work, pair these valves with professional valve service to ensure correct seal and long-term reliability.