Thread: Header Temperatures

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manifold temp has to be at least 500* ( and 650* to be accurate ) for an O2 sensor to run in closed loop, so it's gotta be hotter than that under break in?

Originally Posted by Matt167

manifold temp has to be at least 500* ( and 650* to be accurate ) for an O2 sensor to run in closed loop, so it's gotta be hotter than that under break in?

Think he's talking the external temp of the metal, not the temp of the exhaust gas, Matt.....

IMO, 375 for ceramic coated or stainless headers is a bit high... With an ECM, probably not a heck of a lot you can do about it though... Sounds like you're going to have some blued headers..... Might as well get some header wrap, the high underhood temps won't be doing anything good for the performance of the engine.....

I know alot of the F.I. stuff runs alot hotter exaust temps than a carbed ride,.......emissions I guess?Trying to burn all the unused fuel there in the exaust manifold?
Sounds like normal breakin glow to me on the glowing at 20 mins ...whats the temp at idle?
My rams horns were dull red{with carb} in the thin spots after break in and I stoped once in the middle to get a air pocket out of the engine and to let the" almost " fire with the high heat paint cool off.

sounds like everything is ok to me, that is breakin.... since your headers are now blued anyways might as well buy some jet hot and ceramic coat them so at least the high temps wont be coming through as much.....