These are off of my 422 and 408ci motor. They have a flat spot right before the collector. It does not effect any power if you have a drop car it would have done the same thing., I made 480rwhp with a LS6 intake through these headers through a 200-4R with a HUGE converter. The collectors have been welded on. They are coated also. I'd like to get $350obo + shipping for them. Email me at chris@markiiisys.com or pst up here if you have anymore questions.

 

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