I have a buick 455 that was built by kenne bell in 76 but never ran and was sitting apart, went thru and cleaned everything up and ran great for 1200miles then noticed heavy smoke on the passenger side exhaust, checked plugs and second one from rear on passenger was full of oil did a compression check reading about 200psi, changed valve seals still the same issue ( has valve seal on intake and exhaust ) has stage 3 heads ( ported over the counter from kenne bell ) pulled head off and had a lot of oil all over pistons and valves, cleaned everything up, changed modulator on trans incase it was sucking fluid up and tried again same issues almost right away, took it apart again this time i pulled piston out and checked rings and all looked good rechecked position also changed cam and lifter out while i had it apart started it did break in ran good for the first 30mins and started missing again, took it apart and oil everywhere in the head and exhaust port on header and looks as the far rear is starting aswell trying to figure out if its a issue with the heads or lower end is its a head issue id like to get a pair of aluminum stage 2 heads for it
Any chance the PCV hose plugs into the runner for that cylinder? Do any bolts go into threaded holes that enter the intake ports in the manifold or cylinder head? Oil drainback holes in the heads plugged/restricted? Excess oil coming up from the lifters, flooding the valve-cover area?
Either you have a valve guide that is completely shot, or there is a crack in the head letting oil into the port.
"Ported" head got thin in the pushrod-pinch area, either they ground through, or the casting was too thin and has since cracked???
The Intake port / intake runner that shows the greatest signs of oil has a crack/ pin hole or a bad Intake valve guide or a really really bad Exh guide. A crack / pin hole will suck in oil once things warm up from under the valve cover, but oil getting into a Intake port will due to reversion at low rpms get blasted out of the bad port and spread out to all the other cylinders on that side of a duel plane Intake , or across all cylinders in a single plane Intake.
If you had an oil ring problem, it would come up above the piston that way, not through the port. The block? I can't think of anything that would cause oil to leak into the port.
