Thread: enlarging the intake valve reliefs

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Isky has tools to rent, but they have always been out of them whenever I tried to use them.
http://www.iskycams.com/onlinecatalog.html
If this link does not show the tool, go to page 17 Isky catalog, valve notching tool.

I have made my own cutters in the past from an old valve and a lathe tool bit. Sharpen the edge of the bit and silver solder/braze it to the valve face. Use a bushing collar with a set screw on the valve stem to limit the depth of cut. Grind the end of the bit for a 0.125" radius to prevent a sharp corner on the piston crown.

McMaster Carr has the collars and tool bits. Go to their site and type in Shaft Collars for the collar. Type in Square Tool Bit Blanks for the bit. 1/4" x 2 1/2" M2 high-speed steel is what you'll need.