I have the TF 240s and fenderwell headers. On my car, there is a balance between being able to pull the valve covers off easy with the MC in place, and also clearance with the fenderwell headers. To aide in the valve cover removal, I have an offset master cylinder adapter plate. However, the tradeoff with that is that it brings the MC closer to the header tube. So, I had to ding the header tube a little to make sure they didnt touch. My motor is mounted with a motor plate - so not sure if that changes anything with regard to these clearances.
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