All I know is ... fire car up driveway... your tune is your tune.
let it idle up to operating temperature. idle temperature should be at or right around thermostat. so ok, yours probably will go up 20 + F past the thermostat temperature.
leave it idle for 30 mins or maybe hour, not sure what your temperature outside is? Maybe it is super hot there?
point being you are replicating sitting in traffic.
so once you've had enough beers sitting out there letting it idle... go in the car.
rev it up to 1500 rpm, if after 5 mins (or less) it drops +20 F then you have a flow problem
As cliff said, you can run 160F thermostat and that will buy you more time but if there is a problem with cooling system you are just masking it...
Some people run a higher idle, some people run a different water pump that spins faster at the RPM then run ( TUNE )..
Some people find a different pulley and start with that.
the mods to the stock water pump divider plate that come with stock water pumps is a good mod.. as featured in older PY news letter.
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69 Gto, 390 posi gears,th400 w/jim hand converter/406 pontiac/#64 HEADS/ 10:1 compression/ 190 PSI with/ TRW 160 thou domes / hooker headers 1 7/8, PRW 1.5 rockers, 405 Crower Springs, Holley 750 vac with proform upgrade, Performer RPM on points / 284 H Single Pattern Crane
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