Stock 400 small bock with bigger cam

[ChuckN]

looks like a couple are gunky with oil. Given that they’re all within 10psi of each other, I’d say you could use some valve seals. But that’s just my guess.

Some are looking pretty powdery.

 

[Patman]

it was re-ringed, about 3500mi ago. It also had a cam installed with heavier springs, lifters and roller tipped rockers. It looks like he put in new valve seals then, mainly because they are blue in color.

I would like a borescope so I can look the cylinder, piston and such...