Scotty I recently traded my old bike for a 1992 Toyota pickup regular cab 22re 5spd 2wd 121k miles.  

Personal history:

after changing some coolant lines (and a head gasket, .020” off the head... whoops). She has provided 2k miles of reliable Maintenance free service While achieving 300 miles every 11-12 gallons of gas.

my question:

I set properly the valve clearances to.012.”  I improperly performed it with the engine cold.  Does this tolerance on the 22re expand or contract with heat?  The valves sound noisy, but I prefer to run it loose since the cam journals on the 22re’s design is its engineered obsolescence. The lack of camshaft berrings makes this a weak spot.  

I would prefer to avoid head damage at any expense... even noisy valveTran.

please advise.