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Ok here is the deal, the lifters are poorly designed and prone to noise or "tick", the way to silence this is not just new lifters but new rocker arm assemblies which include new lifters. Use the best parts not the cheapest ones, factory new one are improved from previous designs. If you still want to just replace the lifters you must take the rockers to a machine shop and have the lifters pressed out and replaced by them. Another suggestion is if you live in a warm climate use 10W-30W synthetic oil.
Here are 3 causes for lifter tick!
Bad Lifter, Dirty Oil Deposits, Bent Push Rod, The rocker arms will make a noise if push rod clearance is not adjusted right. God-Bless! and hope this helps you!or the rocker arms may be worn.
The repair depends on the exact cause. Typically one of two things happens.
A lifter fails to "pump up" and looses pressure. Sometimes oil system cleaners can help this.
The other thing that happens is wear realted, called a collapsed lifter, this issue requires replacement of the camshaft and all lifters. I recommend against replacing only a collapsed lifter, as the cam lobe usually gets damaged, as the two parts are hardened and wear against one another (cam and lifter).
It is always possible to have a rocker arm come loose. The only way to know for sure is exploritory surgery.
if high milage motor seems fine leave it as is-not proper way to fix either have worn cam, rocker, or bad lifter. old chevy motors with car running was zero latch no ticking 3/4 to 1 turn to center lifter plunger