So a little backstory on the car to start.
-Bought the car with a bad flywheel at 143k miles, while replacing the main chain guide "fell apart" and skipped timing.
Onto the motor repairs
-Replaced 10 bent valves
-new headgaskets and all new valve stem seals, also lapped all 40 valve seats.
-new valley pan gasket and check valves
-new oem timing chain tensioners, chains and guides, all new gaskets and JHM mechanical adjusters.
-Visual inspection of the cylinder walls proved no scoring only normal wear.
-tons of other new parts, VC gaskets, spark plugs, motor mounts and front and rear main seals.
Problems now at 147k
Car runs great other than the following
-the loss of about 1qt. of oil over 150 miles or so (tried switching to thicker oil but did not help)
-On cold startup there is a misfire that has been slowly getting worse since the change to heavier oil and colder weather. (misfire also disappears after the car is warm or over 3k RPM)
-Pistons are already coated with carbon buildup
-Replaced PCV valve at 146k but still having the same problems
-There is no noticeable exhaust smoke, especially for this amount of oil loss
-Last time the car was scanned I got misfire codes for cylinders 1-4 which I believe is leading to the Secondary Air/ O2 Codes I'm getting. No timing codes whatsoever have been stored since the repairs.
-Blow by, or possibly PCV issue.
-Could be rings but the car pulls very well and theres no way compression numbers would be low enough to suggest bad rings/walls and still run this strong.