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All the rocker arms on my Chevy 350 are tapping and loose while accelerating down the highway why?
Wiki User
∙ 17y ago
A Chev 350 uses hydraulic lifters to keep the valve lash adjusted correctly and minimize lifter noise. Intermittent lifter noise is almost always the result of oil pressure problems. Make sure the oil pressure isn't dropping and that you have sufficient oil to for the oil pump to pick up and pump through the oil journals. Another possibility is that you may be "foaming" when the engine RPM goes too high. If you're pumping foamed oil, the lifters won't function properly. Foaming is partially caused by high RPM, but if the oil viscosity is too light, that too can contribute. If you're running a 5 W 15 oil, you might want to consider a slightly higher viscosity, but don't go too high.
Wiki User
∙ 17y ago
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