Lifters
2 Answers
It is possible the rocker arms may need adjustment, but usually it is lifter noise, sticky lifters, try putting a additive for the lifters into the oil to try and clean varnish build up. Someone at a auto parts store can recommend an additive to try.
1987- your car is 30 years old! and the sound goes away as soon as oil pressure is up- i don't see a problem here-