I have a later, full pressure 235 in my 57 GMC with an “848” head and upon initial startup there is no smoke out of the tailpipe until maybe about a mile down the road, then it smokes like mad for a bit and at a constant 50mph there is minimal smoke, noticeably more upon deceleration and after a few moments of idling it pours smoke!
I have not conducted a compression test yet but thought I would pill the collective wisdom here before digging in!!
Valve stem seals?
Thanks for any input guys!!
