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Discussion Starter #1 (Edited)
I have a fresh 406 with 165 miles, cylinders 2 3, 7 have oil in the combustion chambers.
rings are total seal street, fresh hone. short of me yanking it completely apart the machine shop is pretty much no help

.the previous build was essentially the same, same style rings no smoke!

I did swap in the inner Springs recently after cam break in

its .possible I damaged some of the seals.

I noticed there was oil in the intake plenum,I installed an ai/ oil separator on the PCV system. no change still smokes number 2 plug getting oil fouled.after 65 miles today.

Noticed each of the problematic cylinders is fed by the same side of 180*plenum

I was going to switch the valve seals on those 3 cylinders but any other ideas?

any help is appreciated I'm seriously bummed at this point.
Thanks,
R68
 

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Any chance oil pulled thru the intake gasket seal? But that does not jive with oil in plenum.

Before you pull motor, I would run a leak down to see if rings are sealing, providing you have verified oil seals .
Only other place I can think of would be oil pulled in thru rocker arm studs.
You do have valve cover baffling for that pcv hose don't you?
 

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To avoid these problems I pay my builder a premium, something happens I can yank the motor out and bring it to him and he's only too glad to fix it. It's only happened once with a dropped oil pickup tube. Now he's building me a 454 that's going to rev to 6200 and I keep teasing him "something happens, it's on you...."
 

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Kind of a long shot, but is there any chance the intake is cracked?
 
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