Maybe timing chain tensioners or lifters. What kind of oil filter are you using? I only use the Motorcraft Ford one due to the anti-drain back valving in it. It sounds like your valve train is dry on start if its not the chains.
K&n filter 5w20 oil full synthetic. If it was the timing chain, I would think I would hear the noise coming from the timing cover right. I was told not to get a cheap filter. No ok be ever said it had to be a motorcraft.
Any way to see if the timing chain has slack in it with out taking timing cover off? In not long get the car. I did not notic the tap/rattle till I changed my oil 5w20 full synthetic.it had a fram on it so that's what i put back on. Then heard the rattle so I did some reading up. Saw the thing about the anti drain bike valve and to make sure i got a good filter so i put k&n on it. Also did by spark plugs and doubled checked they are tight.
Yeas been sitting up for a min because of fuel pump. A old man had it. I took valve cover off. Every thing looks good on driver. Idk about passages side yet. I think it would be wise to re torque the bolts