The only carbide burrs I could find in my catalog are 1/4 shank. I'm almost 100% sure you can't get a 1/4" collet for a dremel but I could be wrong. Either way J&L part number BUA-10310L should be a good bit for gasket matching if you need to remove a lot of material, if not check out Standard Abrasives, they have cylinder head porting kits that come with all the flap wheels and sanding rolls needed.
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Last edited by VIP1; 11-28-2007 at 10:48 AM.