440 headers getting extremely hot

[BlaineKaiser450]

I have a 440 that the headers are getting insanely hot on. On the hottest cylinder, it's 871 degrees at idle, and the lowest is around 660. I don't know what they're supposed to be, but this has to be too hot, as if I run it for 10ish minutes it will actually boil the power steering fluid. The timing is set at 20 before tdc initial, and about 35-36 before tdc at around 3000 rpm, which as I understand is right in the zone it should be. Other details on the motor are a Holley 870 avenger double pumper with #85 main jets, a high rise single plane intake manifold (weiand team G), full roller valve train, and around 10.3:1 compression. I can't really figure this out, so if anyone can help me that would be great!! Oh, by the way the water is right at 170 degrees, and I'm at 200 feet elevation.

[c00nhunterjoe]

In my opinion 600 is fine. I would be more incline to investigate the differences. Check plug gap and wire resistance to start. Check valve lash since you are adjustable. Frm there it could be variations in cylinders.


If you want to try and lower the egts though, you can give it some more initial timing to try and cool it down bump the total up to 38 and see what your initial looks like, then recheck egts.

[FLG]

Is this a new engine? Egt's will be hotter during initial breakin

[70 Charger RT]

Will a different spark plug make a difference?  Just puting it out there.

[BlaineKaiser450]

I'm thinking it could possibly be the valves being out of adjustment. The motor is new, but should be broken in by now, just from past experience. The plugs are giving me a lean reading, which should be the cause of the heat, I just don't understand how with such a large carb, and it runs pretty strongly. Anyone have any other input?

[cdr]

lean

[Paul G]

I am going to lean toward valve adjustment. If the exhaust valves are not fully seating that may cause your problem. Especially since some cylinders are way hotter than others. Is this a new engine build? Are your rockers stock or adjustable?

[c00nhunterjoe]

Your 870 has the ability to flow more air. If it is not jetted properly it will burn lean.

Verify valve lash, tune carb and total timing and recheck your numbers.

[Chryco Psycho]

I agree , the size of the carb has no effect on rich or lean you have to have approx 14 parts air to 1 part fuel if the mixture is lean either through idle mix screws or jetting you need more fuel / air flow .

[flyinlow]

My painted headers will be about 600-650* F at the first bend at idle after a drive, checked  with my Harbor frieght lazer temp gauge. The spreed you have would be a concern,