Ticking from engine?
 

After a couple tries the old 850 that had been standing for a couple years fired right up, but now its making this weird ticking sound, and as i am no mechanic, im wondering what it could be. Thanks yall! https://drive.google.com/file/d/1STUUZjOwoN99U7Vw4f3RxFbyhAKMS8oB/view?usp=drivesdk

It's common on the pre 2000 850's for the hydraulic lifters to make noise. How do you fix it? Change the oil and if still making noise - drive the car around a couple of blocks with the engine rpms near 4000. The lifters will eventually quieten down. How do you prevent it? Drive the engine above 4000 rpms occasionally.