------Us guys with big block Corvettes have suffered forever with different over-heating issues.All of the above mentioned are important.The infrared gun will really help you out.Shoot it somewhere near the sending unit and then check against the guage.The sending units sold today and even old ones are calibrated differently than the original one that came in your engine.You may be actually running cooler than you think.If you find this to be true get a Corvette Central catalog(or
www.corvettecentral.com).In there somewhere you will find a little infinetly adjustable inline electrical "dohickey" (technical enough for you?) that,once installed,you can adjust the guage reading to read correctly.It doesnt cost too much and will keep your guage reading correctly forever.Hope this helps as it is a real slick little unit..............Bill S