well guy';s .This the first time this has happened.ooch!
I was warming up engine to tune it , and had a fan in front of car blowing thru rad.
On fast idle ,after a few min. pass side center tubes got red hot ,only those two did it,first time this has happened ..
temp gauge shows normal. does'nt smell hot or anything funny going on , starts fine . ..
Is my timing off a litttle?
holley 670 carb , eddy RPM package on the engine . 20K on engine ,never did it before (at least I never seen it before)
Gonna check timing and stuff here in a few min.
retarded timing?
any thoughts?
Thanks

checked timing , 12 @ idle 36 total,
I'll back it down to 34 and see what happens

Help me out here guy's
I moved timing to 34 total @ 3K or so
If I have it on fast idle (with fans blowing thru the front) it still is doing it.
4 and 6 cylinder first then 8 header pipe,but the drivers bank don't even get close to red .
WTF ?

Have you changed anything prior to the glowing?
Possibly too lean or not enough advance

Nope , have had this set-up in the dizzy since the beginning .
I cannot for the life of me figure out why this is just happened
But why the 2 center pipes doing it ?

glowing headers is a definate sign of retarded timing ,excessive fuel is being burned off in the headers .

Okay . so If timing is set at 12 base ,what way would take that away?
10 or 14 ? excuse me if I sound stupid .

I'd bump it up to 14* and see what happens

Have you changed anything prior to the glowing?
Possibly too lean or not enough advance
Just put new plugs in it . same ones I used berfore
Changed timing to 14 base , still after 2 minutes or so , they glow :mad:
checked float level . checked idle mixture screws . all good .
this is gettin old fast
thanks for yer help,
any more thoughts?

I run a lot of timing at idle, like 18-20* my setup sounds close to yours. 10:1 flatops, 274 cam, hump heads, rpm intake and 650 holley.
Bump it up and see what happends, take it down the road. And see how it likes the timing.
Are you smoking at all?

Scott, first verify that your ballancer has not slipped its elastometer (outer ring moved from hub), next try a different carb.
If you are getting an acurate timing reading none of the above settings you mentioned could possibly have that kind of an effect on the burn.

To me, it sounds like a carb problem, you either need to tear that one apart and clean the hell out of it with carb cleaner and compressed air, or, try another carb..........

You need to advance (increase) the timing, If you are running a vac. advance make sure to disconect it from it's port, and if you have an inductive timing light make sure it's zero'd out.
I'd also re-check the gaps on the plugs

Probably not but make sure the hot pipes didnt become clogged or collapsed..
Hulk

This could be a vacuum leak on the intake manifold gasket. Anyways, sound like those two cylinders are running very lean for some reason.

This could be a vacuum leak on the intake manifold gasket. Anyways, sound like those two cylinders are running very lean for some reason.
+1^^

This could be a vacuum leak on the intake manifold gasket. Anyways, sound like those two cylinders are running very lean for some reason.

+2 ;)

+2 ;)

A/F wise, I think that's about the only thing that could affect individual cylinders on a carbed car.

A/F wise, I think that's about the only thing that could affect individual cylinders on a carbed car.
Yep!:)

Guys , Thanks for the replys , Update , I did pull all plugs last night AND they all except 1 and 7 are white , 1 and 7 are kinda black (normal black )

Jeff, this is a new 200$ balancer on this thing , but I will check it anyway ..
I don't have another carb to try at the moment
Will brake clean find an intake leak for me ? WD40 ?
I just can't believe this has been going on without me knowing about it till now

A/F wise, I think that's about the only thing that could affect individual cylinders on a carbed car.
so , Ya thinking I got some junk in the carb? , , The Holley has 2 filters in the carb plus 1 before that , and 1 right at the tank ,(prolly too many filters)

Maybe the carb needs to be taken apart and cleaned out?

Bad carb would affect more than 2 cylinders. It's possible I guess depending on the runner configuration, but I'd go after the vacuum leak first. I used either carb spray, or water in a squirt bottle.

Scott, I would be suspicous of the intake manifold leak. Does the manifold have an egr?

Did you just take your car out of storage? This may sound off the wall. But, I had more or less that same thing happen to me. I had chipmunk nests in my tail pipes. Never hurts to take a look. I lucked out to figure mine out pretty quick. All I did was discolor my ceramic headers a bit. Speaking of which ,does anyone know if you can buff them out or polish them again. Or will I have to get them refinished?

Scott, I would be suspicous of the intake manifold leak. Does the manifold have an egr?
No EGR , Mark.
I just cleaned and put carb back on..
Still does it , I have squirted carb all around carb bottom and Intake .
Cannot detect a change in RPM
How can this be?
Intake leak that I can't find?
I have driven the car almost 800 mi. this spring allready,.
Seems to have just happened :(
This is really starting to irratate me

Intake leak that I can't find?

The intake could be sucking air from the lifter valley. Thats why I asked about the egr. Is the car smoking any?
Disconect the pcv and see if there is any vacume inside the engine.

Mark no smoke, there is vacum at my PCV (pulsating).

Keep in mind guys this happens when I have it on fast idle (1700) 2,4 then 8, then 2
drivers side does not do it ever

Mark no smoke, there is vacum at my PCV (pulsating).
Sounds like it may well be the intake manifold is leaking on the underside. Can you get a vacume guage on the valve cover breather hole and plug the other side (even if just with your hand) to get a reading? a slight pulsation would be evpected but I dont think the block would have any signiffigant vacume. On the contrary, I would expect the block would have a positive charge resulting from blow-by at the rings.

Just trying to help here. best of luck to ya..

Mark

What kind of headers are they??

Intial timing should be around 16, total 34 or so. Sounds like a vacuum problem on the adjoining cylinders common to the red tubes.

Are you running any vac advance?

With the initial at 12°, total at 36°, and vac advance ought to put 15-20° on top of that at light throttle.

Of course, that doesn't explain pass side only, unless you can't see driver's side glowing due to the underhood light.

yup, timing marks are all good . using advance
I can see driver side with lights off.does'nt get red
I took the intake off and it's hard to tell if there is a leak there .
I'm gonna get new gaskets and see what happens ,
I keep you guy's informed
again thanks for all the help
you guy's a great !!!!

What kind of headers are they??
hedman elite ceramic

Hopefully you haven't damaged those ceramic headers. Jet hot told me not to let mine get too hot on startup or it would damage the ceramic coating and void the warranty.

Hopefully you haven't damaged those ceramic headers. Jet hot told me not to let mine get too hot on startup or it would damage the ceramic coating and void the warranty.
Ztoy , I can't see any damage..yet!

the isssue is uaully not enough initial timing (need more) or too lean air:fuel

I had a Edel performer manifold with a crack on the bottom of it. Don't know how the heck it got there but it is possible I suppose.

My headers would only glow when the vacuum advance was disconnected...

You ever figure out what was causing this???

Yes I did , thanks for asking .
It appears to have been the intake gasket on the inside .
I used a fel-pro last time i had it apart, the first time I put it together I used Eddy's gaskets
Must be it don't like fel-pro's
Thanks again

I am glad you got her fixed Scott.
YW,
Mark

You need to advance (increase) the timing, ..................

Absolutely. Retarding the timing will make it even worse. Advancing it might help.

Thanks for all the advice and help from all if ya's ,
You too Mark ,lol

My guess is that you are running lean.. Check the plugs to see if they look white... I would richen up the mixture or try a larger cfm carb if you have one... Do you have any vacum leeks?:bowtie:

LOL.
some people just dont read the whole thread..
pssst....70SSman
He fixed it.
read post 41
nbl
Mark