if you pull the head check the cylinder for scratches. Lainhart had a smoking problem with his 427 s.o.
It would smoke when you accelerated from 50 mph. It would not smoke at idle or cruising at 50.
I pulled the intake thinking it would be the gasket. Could not find any sign of a problem. Pulled the head and found two small scratches in number 2 and 4 cylinders.
Lainhart took the motor to Keith Craft, who honed it .002 and replaced the pistons. He also installed a stroker kit. Now it's a 487 S.O.
Dwight
P.S. the only thing that smokes now, is the back tires.
