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6.9 6 speed
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5,421 Posts
or your shot of nitrous burnt/broke the rings? broken rings will leave scratches like that in the cylinder walls too. how deep is "pretty deep" you might be able to hone it out, put new rings in it, and be good to go. this is why I stay away from nitrous!
thats what I was thinking
 

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6.9 6 speed
Joined
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5,421 Posts
Having a 408 built and not tunning it was a stupid mistake, especially the fact that you did not even have a wideband. If your going to spend the money to have a motor built you should plan ahead to atleast have a wideband.
 
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