These are the worlds’ most hammered valve tappets. They came from the white 1971 MGB in the another post. It didn’t run right, and we started with the obvious culprits, but when carbs and ignition didn’t bear fruit, we measured the displacement of the pushrods, which revealed quite a range of different numbers, so we suspected a worn cam.
Next we removed the side covers and cam followers, only to find this array of ugly lifters. Clearly, the pitted lifters were grinding away the cam lobes, or vice verse.
The cam has been munched on these three lobes, and the abrasive pitting shown clearly is abrading the lobes even further. The tappet on the right is fine, for comparison. Take a look at the notes below, and you can see the lift we measured on the worn cam lobes, which happen to coincide with the hammered three tappets shown above.
If you are unfamiliar, these little lifters are riding on the cam lobes, metal to metal. If you don’t run ZDDP additive in you oil or some other classic car-friendly motor oil that already has this additive, you run the risk of wiping out your lifters and making them look like these, and your cam will suffer, and you will be rebuilding your engine soon!
Not all oil is the same. Make sure you are running an oil with zinc additive, or you can purchase ours by clicking here!