Rx7man
Cattle Rubbing Post
I invested a LOT of money into burrs.. some of the smaller ones were $12 each, but they're indispensible. I need a better drive system now though
I have a long shank 1/4 drive, 3/8th tip "tree" shaped burr that is excellent, it's a little big for transfer ports, but works very nicely on intakes and exhausts. It was essential doing the Cummins head where you gotta reach in 6"
For the next step finer, I like the ball nose 1/8th drive for contouring, usually a 1/4" is still small enough for most of the work
and for the last bit of material removal, 1/8th drive, 1/8 nose burrs, I have some tapered, oval, and straight ones, each has their own application.
Emery cloth on a split mandrel for the polishing, and for rounding the port to cylinder corners, I use about a 3/8th round stone on a 1/8th shank, does a nice job of breaking the edge without chipping the chrome
I have a long shank 1/4 drive, 3/8th tip "tree" shaped burr that is excellent, it's a little big for transfer ports, but works very nicely on intakes and exhausts. It was essential doing the Cummins head where you gotta reach in 6"
For the next step finer, I like the ball nose 1/8th drive for contouring, usually a 1/4" is still small enough for most of the work
and for the last bit of material removal, 1/8th drive, 1/8 nose burrs, I have some tapered, oval, and straight ones, each has their own application.
Emery cloth on a split mandrel for the polishing, and for rounding the port to cylinder corners, I use about a 3/8th round stone on a 1/8th shank, does a nice job of breaking the edge without chipping the chrome