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Re: 64 Chevy pickup, rebuild engine, tapping noise in
Remove the valve cover and rotate the engine and check to see if all the valves are opening the same amount. If not, you have either a bad lifter, bent pushrod, or cam going flat. Check your valve lash with the valves closed. You should be at 0 lash at all of the rocker arms.
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might be the valves have been damaged running without oil
- or the crankshaft / camshaft / main bearings
most probably you have to let the engine be rebuilt by a mechanic
(expect cost of more than US$ 2.000)
or get another (used) engine at a scrapyard
Nothing. Also it will be much cheaper to find a used matching transmission with low (less than 80k miles) than having a shop rebuild the old one. In most cases the used transmission will far outlast the rebuilt one. Check on the web by Googling "used transmissions".
My best guess is that you might have thrown a rod. You will experience a great loss of power, and if you were to drain your oil, you would notice a decent amount of metal chunks. Generally a light tapping noise is uncommon for a engine with 80k, but depending on how well it has been taken care of (ie. oil changes, high RPM, low grade fuel) it is possibe to damage an engine with that low mileage. You would be better off taking your vehicle to a reputable mechanic that has access to rebuild parts. Good Luck.
Check Utube for lifter tap, valve tap, and rod bearing noise. If you pull each spark plug one at a time, plugging it back in after each one, the tapping will go away if it's a rod bearing. At any rate, on your next oil change add some valve-medic or similar additive for valve noise. Make sure you follow direction or you will get massive lifter tap if you pour it into a cold engine.