The GM Genuine Parts PCV tube (12642631) is presented as an OE-style replacement for GM small-block and V6 engines, offering factory-fit dimensions: length ~14.5 in, inlet OD 0.75 in, outlet OD 0.50 in, and molded plastic ends with reinforced rubber hose. It lists easy, no-modification installation, durable materials, and reduced leak risk. What about long-term durability, torque specs for clamps, and inspection intervals—should they be checked every 30,000 miles?
Key Takeaways
- OEM-design PCV tube (GM Genuine Parts 12642631) fits GM small-block and V6 engines for direct replacement without modification.
- Constructed from reinforced rubber and molded plastic ends to resist cracking and preserve vacuum integrity.
- Exact dimensions (11.2″ length, 0.62″ inlet, 0.47″ outlet) and factory clip locations ensure proper fit and leak minimization.
- Installation is straightforward (15–30 minutes) with basic tools; verify part number and O-rings before fitting.
- Inspect every 30,000 miles and replace if cracked or clogged to maintain crankcase ventilation and engine performance.
Product Overview and OEM Heritage
Product Overview and OEM Heritage: The GM Genuine Parts 12642631 PCV tube is an OE-design replacement component engineered specifically for GM small-block and V6 engines, offering direct-fit dimensions, factory-compatible connections, and material specifications that match original equipment.
The GM Genuine Parts 12642631 PCV tube: OE-designed direct-fit for GM small-block and V6 engines, matching factory specs.
It carries GM pedigree, formerly ACDelco GM Original Equipment, designed and validated by GM engineers.
Who benefits? Owners seeking reliability and freedom from fitment guesswork.
What to note: length 11.2 in, inlet/outlet diameters 0.62 in and 0.47 in, factory clip locations retained.
Practical considerations: backed by GM testing, updated production revisions possible, straightforward installation, dealer availability.
Fitment, Materials, and Performance
Fitment is straightforward: the GM Genuine Parts 12642631 PCV tube is engineered to match OE dimensions—11.2 inches long, with inlet and outlet diameters of 0.62 in and 0.47 in respectively—and uses the factory clip locations for direct replacement without modification. It fits original mounting, minimizes leaks, and preserves crankcase ventilation flow. Materials: reinforced rubber and molded plastic ends resist oil, heat, and ozone. Performance: stable under pressure, OEM-calibrated flow, longevity aligned with GM standards.
| Attribute | Value | Note |
|---|---|---|
| Length | 11.2 in | OE match |
| Inlet/Outlet | 0.62/0.47 in | Flow spec |
| Material | Rubber/Plastic | Heat/oil resistant |
Installation Tips and Maintenance Considerations
When preparing to install the GM Genuine Parts 12642631 PCV tube, technicians and DIYers should verify vehicle compatibility, gather basic hand tools, and plan for a 15–30 minute procedure depending on access and experience.
The installer is advised to check part numbers, inspect O-rings, and measure hose lengths: typical tube length ~6–8 inches, inner diameter specs per vehicle.
Verify part numbers, inspect O‑rings, and measure hose length—typically 6–8 inches; confirm vehicle-specific inner diameters.
Q: What tools?
A: 8mm socket, pliers, clean rag, torque wrench optional.
Q: Maintenance?
A: Inspect every 30,000 miles, replace if cracked or clogged, clean connections, ascertain vacuum integrity.
Follow torque specs, discard damaged clips.
Frequently Asked Questions
Does This PCV Tube Come With a Warranty or Return Policy?
Yes, it typically includes GM-backed limited warranty and return options; the manufacturer’s policy grants replacement or refund under coverage terms. The reader should verify specific warranty duration and return conditions with the seller or GM.
Is This GM Part Manufactured in the United States?
No—origin varies; GM Genuine Parts are produced in multiple countries including the United States, but specific PCV tube 12642631 may be manufactured elsewhere. Buyers seeking liberation should request country-of-origin confirmation from GM.
Are Any Clamps or Hardware Included With the Tube?
No, the tube ships without clamps or extra hardware; the purchaser secures liberated installation by sourcing OEM or equivalent fasteners separately, ensuring proper fitment and freedom from compromise through validated GM-specified components and careful selection.
Can This Tube Be Used With Aftermarket PCV Valves?
Yes — the tube can function with aftermarket PCV valves if dimensions and fittings match. Enthusiasts seeking autonomy should verify compatibility, prioritize quality aftermarket parts, and confirm seal integrity to preserve engine performance and freedom from failures.
Is There a Recommended Torque Spec for the Mounting Fastener?
Yes — GM specifies a torque of 9 Nm (80 in-lbs) for the mounting fastener. A hush of certainty follows; the liberated mechanic breathes easy, knowing precise restraint prevents leaks and preserves engineered harmony.
Conclusion
The GM Genuine Parts PCV tube (12642631) proves a practical, OE-design replacement for GM small-block and V6 engines, offering factory-compatible connections, reinforced rubber and molded-plastic construction, and precise fit: length ~12.5 in, inner diameter ~0.5 in. Easy to install without modification, it supports reliable crankcase ventilation and minimizes leaks. Concerned about longevity? Routine inspection every 30,000 miles and replacing worn seals prevents premature failure, ensuring consistent performance and peace of mind.
