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I HAVE HEARD SEVERAL TIMES THAT RUNNING OPEN HEADERS OR STRAIGHT PIPES WILL CAUSE VALVE TROUBLE. I RAN OPEN EXHAUST ON A 72 CHEVY TRUCK FOR 10 YEARS WITHOUT ANY TROUBLE. WHAT DO YOU THINK?
 

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You know, using all caps is considered yelling...but after 10 years of open exhaust I can see why you would need to yell


If you dont lean the engine out from the free flowing exhaust then it wont hurt anything....other than your hearing, and your wallet when you get tickets all the time, oh and brain cells from all the exhaust fumes not getting vented out from under the vehicle.

Just razzing you
 

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I just read the latest Car Craft, and they did a test with three different exhaust systems on a Mustang with a 400hp 302. With open exhaust, it laid down 333hp at the rear wheels. With an H-pipe exhaust, it laid down 323hp. And with an X-pipe exhaust, it laid down 335hp. So, it appears the days of benefitting from and open exhaust are over, technology has found yet another way to improve upon old thinking.

-Joe

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79' Z28 4-spd- built 355, TRW 10:1 forged flat tops, WP SportsmanII heads, Crane Energizer 230/230 duration .480"/.480" lift, Edelbrock Victor Jr., Holley 750cfm, Dynomax headers, dual 3" flowmasters
3.73 Posi 10-bolt

[This message has been edited by joesmith69 (edited 02-18-2002).]
 

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With short open headers, after hot engine is shut down, cool air can enter exhaust ports and could bend valves.

That's why most dragsters have those caps on ends of headers.

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Don~ ZZ430DropTophttp://hometown.aol.com/zz430droptop67rs
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70 RS/Z28
67 RS/SS Convertible, 70 RS/Z28
 
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