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Ok so after reading all 3 links...the first link says ground strap shows heat range and the other 2 links say it shows timing...so which is it?



This is the internet... you might get some more ideas
BUT I've use the strap as a timing indicator... as
in the link I posted





i also use the stap to check timing. on gas that is. iam getting ready to run my fist alky motor, how will this affect it?



Alky makes it harder to read, it will burn considerably cleaner because it doesnt have any additives in it. I run NGKs with alky and many use the threads to judge it. You will have to google it up and see what I mean, cant think how to explain it right now.