Stop in for a cup of coffee

Yesterday started Fargo, noisy lifter. After 15 minutes of driving still noisy. Shut off truck, eat ice cream and restart truck, noise gone. Has happened 4 or 5 times now. Any remedy?
1979 la 360 from a motorhome,50,000 miles on it.
The 383 stroker motor I had in my 60 Corvette used to do the same thing every so often maybe four or five times a year. Never really did figure it out. It always went away so I never really worried about it. Car was a screamer .car weighs less than 3,000 lb with almost 500 horsepower and a four-speed with a 4-11 gear