Hello I recently had to install new spark plugs in my 1969 Camaro so I went the E3 route. All was good for a few days until one actually blew out of the block. There was no thread damage fortunately and come to find out a few others were loose. My question is how much do you tighten your spark plugs? I had heard several times to make them hand tight and then another half rotation which I did. Should I reinstall them and go 3/4 turn or what would you suggest? I have good torque wrench and could use that on the ones the headers are not blocking access to. Thanks for your help!