is this bull shit?
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From: plainfield,IL
is this bull ****? when my father found out i was running headers with out cats he freaked out saying ill burn up my valves? is there any truth to this its been over a year now and i was thinking about putting cats to quiet things down a lil. but is that bull ****...i need to know? p.s. hes a ford guy...guess im the fucked up one of the family
It's B.S. Old timers believed that running an OPEN header, with no exaust at all may bend a valve due to the inrush of cooler air into the header after the car is killed. Obviously cold air on a extremely hot valve could cause disfiguring, but I've never seen it. Point is, as long as you have an exaust system attached to the header, there is nothing to worry about. If he still doesn't believe you, tell him to check this thread in a day or so. I'm sure there are 86,000 cars on here with headers/no cats.
^^ Well put by Beast. It is definately an old timer thing. Even running long tube headers with no Y just open headers this isnt really possible. Now at the same time, I wouldnt pull spark plugs on a real hot motor for fear of something like this.
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It might burn a valve is you ran open heads with no headers. 
You can run open headers all you want. The only problem you might run into with open headers is yoru oxygen sensors being skewed at low airflow due to reversion. But even still, a 12" to 18" piece of exhaust pipe past the o2 sensor is all you need to get rid of even that.
To sum up, your dad is misinformed.
You can run open headers all you want. The only problem you might run into with open headers is yoru oxygen sensors being skewed at low airflow due to reversion. But even still, a 12" to 18" piece of exhaust pipe past the o2 sensor is all you need to get rid of even that.To sum up, your dad is misinformed.
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Joined: Sep 2007
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From: Chandler, Az
It's B.S. Old timers believed that running an OPEN header, with no exaust at all may bend a valve due to the inrush of cooler air into the header after the car is killed. Obviously cold air on a extremely hot valve could cause disfiguring, but I've never seen it. Point is, as long as you have an exaust system attached to the header, there is nothing to worry about. If he still doesn't believe you, tell him to check this thread in a day or so. I'm sure there are 86,000 cars on here with headers/no cats.
That reminded me of today at the gas staion when some old guy was like "bet that thing eats up alotta gas huh? I was like sure does. He was like whatcha got on top that thing a 750 double pumper? I was like....sure do...and got in my car and drove off..haha