My 1969 Super Bee had been running great on all cylinders for years until the #3 and #6 plug wires burnt against header tubes.

To make a long story short I have installed new plug wire set, 8 plugs, distributor cap and rotor. But the #3 and #6 plugs still won't fire. I've put plug/wire that worked fine elsewhere and still no fire at 3 & 6. I put the two plugs and wires in different holes and they worked fine. I moved the distributor thinking maybe I had timing too advanced but still the same thing.

What the heck is going on here ?!?!?!?!

I need some help!!

If the plugs fire in another hole and if you move the plug wires to another hole and they work there is only one problem I can think of that would cause your problem, the wires are in the wrong holes in the distributor cap # 3 and #6 are side by side on both Mopar V8
Mopar V8 firing order is 18436572
Good luck, let us know what you find, that will help others on here later

That or cylinders washed down.Try puttin a bit of oil i the holes after you make sure the firing order is correct.Rocky

I have checked firing order on the distributor cap 100 times(literally!!) : )

I've had the car 36 yrs and never seen anything like it.

When I pull the plug wires at the dist cap it arcs between wire and the contact. But the engine doesn't change RPMs or anything. So I know I'm getting fire to the wire. When I pull the other 6 wires the engine loses RPMs.

Could there be some sort of issue at the plug hole that would prevent the plug from grounding properly...?

Maybe a bad cap on those 2.If the wires get fire to the plug it just may be the cap.The plug dosent need to be grounded.It would ground thru the threads or seat anyway unless you have ton of junk and then it should fire anyway.Rocky

No, there is too much contact area. pull the plugs (all of em) & do a quick compression test on at least those (2) holes.

Exactly^^^^^^

You got at least 2 dead cylinders...sure the wires were fried yes, but I bet you got a couple dead cylinders. Sorry. Time for a rebuild.

If it runs pretty well off of idle, I'd look for vacuum leak or possibly dirty passages in carb.

Start with the easy things first. Change the cap and rotor. Be sure the wires are going to the proper plug in the proper order. Then, do a compression test (a shot of oil in each plug hole during the compression test wouldn't hurt.) Its possible the cylinder walls have been washed down with gas when the plugs didn't fire.

And, yes, too much oil (or other junk) on the plug threads will cause a miss fire. Clean the plug threads and plug seats in the heads with carb cleaner, blow it dry, and put a small dab of antiseeze on the plug threads when you install them. Gene

It was running PERFECTLY up until the wires burnt. Now it shakes the whole car at idle or run up.

I will have to check the compression because all the other stuff concerning cap/rotor, pugs and wires are OK>

(1) that is a puzzler (2) for sure more than 1 cyls ain't firing (or not in the right order) but agreed, you have checked em till you are blue in the face. EDIT I would suggest pulling back the plug boots & grounding em with a screwdriver as opposed to pulling the wire(s) off as coils don't like an open expecially on the secondary side tho people do it all the time but since Mr Murphy is paying you a visit on this deal we dont want to pi$$ him off anymore than he already is. For sure post what it ends up being

Run a compression test... See what it reads....

You didn't swap the wires between cylinders?

Remember CCW rotation of the rotor, that's got me once.

Just for funx swap the 3-6 wires in the cap. It won't cost anything. As said before, you may have them crossed.

I got bit once by a Mopar cap with the arrow on it. Wired it up by the arrow direction and it ran like crap. Arrow was in the wrong direction.

You'll never do that again, will you

Nope.

I did cross the 5 and 7 on my 340 when I fired it. They are even numbered at the boots.

Did he ever say if he had fire to the plugs with them out?thats the first thing to check.My Imp once would not start when it had bad plugs and washed the cylinders.Let it dry some oil and new plugs and bingo.Fired right up.I doubt that a cam would go on two cylinders at once.

I haven't tried to see if plug is firing with it out. But those two cylinders were dead with old plug or new plug, old wires or new wires. I replaced wires one at a time so I know there's not a misplacement of wires(AND I have CCW 1-8-4-3-6-5-7-2'd it to death.

This weekend I'm going to run a compression test and see if that is the problem. I'm still hoping and praying that it IS an oversight on my part and not washed cylinders!!

This is a classic sign of dead clys, been there done it many times at work years ago. Every time I found very little or no compression.

Used to just pull plug wires like you did to diagnosis how healthy a motor was without the expense of a compression test. Was never wrong when I did a compression test, it's the only thing it could be at this point. Sorry.

36 years is a long time, Mopar never meant for the motors to last that long.