Not at all likely(and how would that affect only cyl #4?)
Probably a bent valve in number 4 cyl.
And not likely bent “just a little bit” either.
A relatively easy visual inspection for that is to look across the tops of the retainers for that side after removing the rocker shaft.
You’re looking to see if one of the valves/retainers on #4 is noticeably lower than the others.
If that doesn’t answer the question, I’m sure a leak down test of #4 would.