TTI Header Knocking Against Torsion Bar

Please note the sarcasm...
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tti's fit all the time and perfectly and are worth twice what you pay for them!
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On a serious note. You may need to reposition the engine slightly. There are measurements in the instructions IIRC. These cars had huge tolerances when built.

tti will likely tell you they've never heard of such an issue, don't waste your time calling unless it's free.