Whats up guys! Ive been having some problems with overheating lately...I have a 99 ls1 fbody, hardened pushrods rocker arms ect...camm'd (02 ls6)...I can start it up and idle it for ever without it overheating..but after I start driving...there it goes...I first thought thermostat so I swapped it for a 160° ...still actin up....I have a little white smoke..but I just got new head gaskets a good month ago...one thing I noticed is if I cold start it...within 30secs my smog hoses (attatched to my headers) get hot a.f...untouchable forsure...anybody have any ideas? If so plz help me out...

 

Possible air pocket in the cooling system?