what damage can u do running with open headers, just temporarily, i've heard burnt valves ?

 

Open headers will not burn valves.
Exessive lean air/fuel ratios and retarded ignition timing will.
On a car with a borderline fuel system
with full exhuast (starves to motor for fuel at hi rpm) that is then run uncapped, the increase in breathing would now cause exessive lean mixtures and will damage the motor (pistons, valves) The real culpret
is the fuel system (pump,lines,filter) Once this is corrected, the carb will often need new jets 2 to 4 sizes bigger to feed all that newfound airflow.

 

so basically what ur saying is its bad.

 

No,, Open exhaust is not bad.... Running a motor at full throttle with exessive lean fuel mixtures... is....

 

You'll be fine with open headers, people at the track do it all the time.

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"Putting any amount of money into a RICE BURNER is like wiping your a$$ with a turd. "
'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
3" Hooker CatBack w/Aero Chamber muffler
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat, just switched to 180* b/c of winter coming and going to college in the mts.
3:73 Posi
Rebuilt 700R4
B&M Megashifter, 5" Autometer Tach w/shift lite

 

My understanding of the subject (and I could be wrong) was that you are at risk of warping the exhaust valves, not burning them. The reasoning here is that the valves get really hot when the engine is running (duh). Anyway, when you shut the car off, if you don't have enough exhaust then they will be allowed to cool too fast by the outside air and can warp. This is a real possibility if you were to run the car without any exhaust at all. Maybe you saw the post another guy had about a car he was considering buying, the previous owner ran it without the manifolds. With headers you ought to be ok, but I wouldn't drive it any farther than the exhaust shop.

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91 Z28
Come see The Vicious...