I recently bought a 1979 Bronco with the original 400 V8 and have noticed a ticking sound when the truck is first started cold. It last for 4-5 seconds then goes away. I'm running 20w50 and a FL1A filter. Is the oil too heavy for it?
My Chilton manual states 20W-50 is okay if you never see temps below 20 deg. F, also shows 10W-30 or 10W-40 good for zero to 100 deg.
I would probably try 10W-40 at your next oil change and just see how you like it. It will protect you engine just fine and may pump to critical areas a little quicker. The downside is you may have slightly lower oil pressure once the engine is hot, depending on clearances.
A start up ticking sound would be heard in my older higher mileage Ford trucks when they needed an oil change. Changing it would solve this.
Running a thinner oil wouldn't be the solution to ticking imo.
How's your oil pressure?