Are they hydraulic lifters or stock? If hydraulic they should be adjusted to zero lash then in 1/2 to 3/4 turn. Some say more. Unfortunately, unless you built the motor there's no way to tell which you have without looking inside the engine and adjusting the stock lifters to hydraulic specs would likely burn a valve.
Thanks for your help, I believe they are stock lifters. Would you recommend hydraulic lifters? There are less than 4000 miles on the engine rebuild. How often do the lifters need adjusted? Thanks again for your help.
Hydraulic lifters don't need adjusting nearly as often. I check mine every few months or so. But I would not tear down an engine with 4000 miles on it just to get them. In other words, I don't think they're any better.
Thanks for the reply. I think trying the 20w40 or 20w50 oil would be a good starting point. I believe in trying the cheapest fix first.
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