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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | Bart_dup1,
If your '55 Thriftmaster is a truck engine, shouldn't it have solid lifters? If this is true, oil viscosity or any oil additive will have zero bearing on your clicking sound.
The 'lash' you adjust into the valve train when you adjust the valves is intended to compensate for the growth of the components as they heat and expand. If the valves are adjusted properly they should make a slight noise when cold which should diminish as the engine warms up.
Even perfectly adjusted, the valve train should tend to make some noise as opposed to no noise.
STP will do nothing for your problem. It is time to adjust your valves and enjoy the ticking of the old 'bolt'.
Stuart | | |
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