Excessive oil consumption 400 sb

[83c10400]

Hello all,

I am new to this site and a new c10 owner. I am having a problem with my 400 using excessive oil, I do get the occasional puff of smoke on start up and am pretty sure valve seals are leaking, however it's using about 1 quart ever 300 miles maybe less. Compression is good and even, no oil spots on driveway so I doubt it's the rear main leaking, coolant looks clean from what I can see. I'm not sure what else could be causing so much oil loss. Anyone have a similar experience? Any help would be greatly appreciated.

[Jason S]

Do the spark plugs have excessive carbon buildup?

[83c10400]

No they all look normal and have never fouled, I also forgot to add pcv is good,