408, Small or Big Block? Need EGT Info

EGT readings are WORTHLESS. Unless you have very expensive thermocouples (and then it’s still not that good) they react way too slow to give you any meaningful data. Where you mount the EGT in the pipe makes a HUGE difference in what the temperature reading will be.

Learn to read plugs. I watched guys go seven different ways of wrong looking at EGT’s and trying to tune. If you think the EGT’s are high, what on the tune to do you change? What if the EGT’s and the plugs don’t jive? Then what? Trust the EGT or the plugs?

There is no reason to use EGT for much of anything unless you can data log it and have a point of reference for the temps. And even then, it’s a crappy way to tune.