I started my old motor on the shorty headers and like wads56 said it sounds like crap.
I too was told that it can warp a valve running it like that if any cool air gets into the combustion chamber around hot valves but I don't know if it's true or not.
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James Cox
nochevy@hotmail.com
1991 Mustang LX
No good times with 347 stroker yet!