Went to crank Jane up on Friday, and got a fun new noise. Sounds like it is in the valvetrain somewhere.
Car was fine when I pulled into the garage on Wednesday. Oil pressure good, usually it's 55-60psi and it's reading 55 now. Because I have a thicker oil in there (15w-50), cold starts in winter usually have some lifter ticking noise for the first two seconds until it pumps up. But this time, the noise just didn't go away! Lol.
She was due for a valve adjustment this weekend anyways so I had planned on doing that. But now I am wondering - if a lifter has gotten stuck compressed (hence the noise), will adjusting it actually hurt the cam? Bad idea to adjust the lifters? Or will it be very obvious if there's one that's stuck (nut needs a lot more cranking down to pick up the slack, resulting in a lot more stud showing)?
Relevant Specs: 289 last rebuilt 2016, about 40000 miles on it. Biggish Lunati hydraulic flat tappet cam with springs and lifters to match, stock ported iron heads, screw in studs, stock rockers and adjustment nuts.
Video (ignore the belt squeal lol):