My ls motor sometimes blows out white after high rpm. Sometimes during and after high rpm my motor blows out white smoke then disappears and sometimes i smell oil burning.I'm thinking it might be valves seals are going bad but not 100% sure. Did anybody had this problem?

 

Have you checked the oil and coolant levels?

How does the engine oil look?

How does the coolant look?

http://wiki.answers.com/Q/What_can_c...om_the_exhaust

 

White smoke is generally caused by leaking valve stem seals. A leakdown test would confirm.

 

Oil and coolant are good. I'll do a leak down test asap