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My 73 390 ticks after replacing heads, cam, lifters, rods, valves springs. i think it has to do with central oiling system that runs to the cam bearings first. These babbet covered copper bearings are really weak and will kill your top end oil pressure if even slightly damaged. Also valve stacking and complete valvetrain meltdown can occurr. I'm considering porting my oil passages out to 1/2" or better. I think the oil pressure increase will help with the chattering noise.

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Q: What causes ticking in 1966 ford TB 390 engine?
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