5.7L Hemi Tick

What make the Hemi tick? Is it the piston, valves, or header bolts?

Hi Scotty,

I'm a big fan of your show and have been watching for many years. Thanks for all the great shows.

My question is concerning the famous hemi tick on the 5.7l hemi's. Do you have any thoughts on what makes the modern 5.7l hemi make a ticking noise at start up? it goes away after the engine has warmed up. I have heard people say its a header bolt problem, valves ticking, and piston slap. People have even said to use different oils like Royal Purple lieu of Moble one which I have done and I think it did make a small difference (improvement). Maybe its my imagination idk because I have'nt run Royal Purple for many years.

No. 1-1


generally it's valve ticking. Not a cheap fix rebuilding those heads either