Original 1987 V10 Silverado, 350/manual...my truck puffs out white smoke? on start up

[57NAPCO]

1987 V10 350 4 speed 114,000 original miles 100% original.

Needing a bit of help/opinion from the collective

I have owned this truck for a few years now and I notice on cold start up after sitting over night or for a few days it puffs out white smoke or possably steam, just on start up up , it does not continue to smoke that I can tell. By the time I run back to catch a wif it’s dissapated into the air. It runs fine, no issues. I figured if it was oil burn I’d smell it. Radiator fluid is clean, so is oil.

valve guides ?
Rings ?

Truck is up in Maine so I have no tools, just thought I’d throw this out there to see what y’all think.

Thanks