Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Valve Stem Installed Height
To measure valve stem height, place Gauge Tool BT-6428 over installed valve stem, and measure clearance between gauge and stem. Clearance should be at least.035" (350" engines).005" (400", 455" engines). Grind tip of valve stem if clearance less than specified. With valve keys installed on valves, tap all valve stem ends with a hammer to seat valve retainers and keys. Replace Tool BT-6428 over stem, measure clearance between valve stem and gauge, then measure clearance between valve retainer and gauge. If the difference between these two clearances is less than.030", a new valve should be installed.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.