289 oil consumption
I just rebuilt my 289 original engine about 2000 miles ago. The cylinders are +.030, crank -.010 and standard valves, hardened seats, new guides and seals, mild Comp cam. Still running zinc additive in conventional 10w30 oil.
I'm having a problem with it using about a quart of oil / 500 miles. The plugs look OK, Tips are clean and insulators mostly white to gray, none are wet. The exhaust tips are black inside and dry, no oil film on back of car. No drips or leaks under car. Occasional puff of smoke on startup.
I'm thinking it's either
1) rings not seating. I was as meticulous as I know how to be on gapping and staggering ends during rebuild.
2) valve guide / seals leaking
3) pcv sucking oil into carb. Valve covers have a baffle plate horizontally but not vertical.
Any ideas in isolating cause or suggestion of another reason I might look at?