So my roommate is trying to diagnose what is wrong with his built ka24 240sx. Since the build, the engine always sounded like it had excessive piston slap. The last time he had the head off, there was visible wear along the thrust sides of the cylinder liners. You couldn't feel any difference in texture, but visibly it looks a little worn. He drove with the slapping built motor for a year N/A with no issues. This past summer he finally turbo'd the thing, and got it tuned professionally on aem ems to 408whp. Drove the thing for no more than 50 miles and the HG blew. He maybe did 5 or 6 hard high speed pulls with the thing. After going through multiple head gaskets, and finally getting the head milled (again), it finally seals. Now it's still smoking white/blue but not burning coolant. It's gotta be oil. Would piston slap cause severe oil burning? Keep in mind it ran perfect for a few thousand miles N/A with the slap noise. Just started when boosted.