had the intake and exhaust manifolds cleaned and surfaced. just picked them up today...less than impressed with the overall quality of the job but they are better than they were.

so tonight while i have been trying to get the heat riser un-stuck and drill out the broken bolts in the exhaust manifold, i noticed the casting flashing on the interior walls of the manifolds and was wondering if there is any merit in grinding them down to improve air flow or if i should just leave them alone since the truck ran fine before the tear-down?

any and all thoughts are wecomed!

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