Review on 🔍 TEMO SC-3L6 Carbide Burr File: Double Cut, 3/8 Inch Cylindrical Ball Head, 6 Inch Long Shank - Explore Now! by Todd Mohr

I don't know in the long term, but in the short term this is the absolutely PERFECT porting router. It has a slim size, long shaft and perfect shape. You could combine it with a bigger/better drill bit to get more material off, but this thing is perfect for getting into small holes and grinding off the rocker arm nubs/protrusions. Made my LS1 heads with this and a short Forney cylinder drill bit, some sharpening stones and sandpaper, lots of beer and patience. Paired with an IR air cap grinder, which I bought here for about $40, you really can't beat this combo. $70 for $600-$800 transfer tools.