Well, I guess everything I've ever read is wrong. Then, tapping port #4 makes no sense...hmm...Even though fuel flows from #4 to #2 to #1 to #3, 4 channel probes have shown that the cylinders are, in order of highest to lowest temp, #4, #2, #1, and #3. So it is best (and easiest!) to tap the driver's side collector

 

In terms of common failures, #3 cyl is usually a burnt piston, and #4 cyl is usually a broken ring land. Ring land = detonation, burnt piston = preignition. Both are bad, so it doesn't really matter which one you tap!

Problem solved. GGKTHXBAI.

 

honestly it doesnt matter where you tap. The numbers are all relative so you just need to know what number to look for that keys you in to trouble. 1600F is no longer the magic number if you tap it in the up-pipe, its more like 1100F or something (i don't know exactly so don't quote me). As long as you know what tempurature you need to look for, you could put it in the muffler with no real ill effects.

however, after saying that, I would say the manifold is still your best bet, as you will only be getting the temp from that cylinder instead of mixing it with the others, but you cant go wrong tapping it anywhere on the drivers side.

or get this to watch both banks . I think i remember seeing one that had 4 readouts too, but i can't find it.

 

take it i gotta take my header off to do this so i can get the metal shavings that fall inside

 

Yeah.

 

seems like a fun job to do this sat... prob easiest way is to put it up on a lift?

 

Or just put it up on jacks.

Use plenty of liquid wrench (or pb blaster or whatever you prefer) though. I put brand new bolts and nuts on w/ high temp antiseize when I did my shuffle under there, and they're pretty nasty looking already.

And be careful, as the manifolds are actually pretty heavy (cast iron).