The Manley Performance engine valve identified by manufacturer part number 12349-8 is engineered for a measured performance-engine assembly. Final compatibility depends on the exact engine, mating components, and verified dimensions, not a similar product title alone.
Key Features
Fitment
| Fitment Status | Engine and build verification required |
|---|---|
| Required Verification | Exact engine code, dimensions, mating components, material, intended power level, and current Manley application listing |
Specifications
| Brand | Manley Performance |
|---|---|
| Manufacturer Part Number | 12349-8 |
| Product Type | Engine Valve |
| Fitment Type | Fitment Verification Required |
| Condition | New |
| Quantity | 8 |
What's Included
One new Manley Performance engine valve in the exact quantity and configuration stated in the specifications. Bearings, rings, pins, locks, fasteners, and installation hardware are included only when expressly listed for this part number.
About Manley Performance
Manley Performance engineers connecting rods, pistons, crankshafts, valves, valvetrain components, and related hardware for professional street, racing, and forced-induction engine builds.
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Frequently Asked Questions
How do I verify the application for Manley 12349-8?
Match the exact Manley part number and engine code, then confirm every listed dimension, material, mating component, clearance, and intended power level before ordering.
What specifications must match for this engine valve?
Confirm every listed dimension, material, quantity, engine interface, mating component, and current Manley application note. Similar-looking engine components are not automatically interchangeable.
Is professional installation recommended?
Yes. A qualified engine builder should inspect the component, measure the engine and mating parts, verify all clearances, and follow current Manley and engine-manufacturer procedures.
Installation Instructions
Use the current Manley instructions for part number 12349-8 and the engine builder's measured assembly specifications. Verify material, orientation, machining, clearances, fastener procedure, lubrication, balance, torque or stretch values, and break-in before operation.
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