I hate to see people waste their money or spend their money but a 1/8 inch dremel tool is not the right tool for this job.

Those are wood carving bits.

I thought they looked like the ones posted above..back to the drawing board..

The ad claims......



They would probably last long enough to open up that w/p housing.

I'm going to give that a try again on my next aluminum job. I think my problem is I'm not dipping enough and letting the bit run dry.

If you don't do head work often, use a Foredom grinder. Speed control built and uses 1/8 and 1/4 shank bits. It gives you cushion from screwing up a job with better control.Faster learning curve with fewer problems. Dental labs have been using them for years.

I do 100% of my head and intake porting with the higher HP Foredom grinders and the biggest (heavy duty) hand piece. Kinda expensive even used for the guy who isn't going to do this very often. I love mine and will never use anything else again

As for bits,only thing I ever used,don't clog and don't dull,were almost $100 when I bought them,don't know it they are still available.

That's a nice set there Bill...Seems ingersol rand doesn't make much in the US anymore...

I have a feeling a small dremel tool will cause nothing but grief for the material that's needed to be removed from the water pump housing.. As suggested a die grinder size bit will save you some aggravation... Harbor freight has cheapie air die grinders for around 10 bucks..
Here's a pic showing what happens to a normal single flute metal bit in short order when trying to cut aluminum..The two bits on the right side are aluminum cutting bits..There's a stick wax{made by castrol} that you can use to keep the aluminum cutting tools from clogging up I'll include a pic of it..

I got a bit from lowes and hogged out the housing. I think it will work just fine now. The lower left port is the culprit that is too small and i opened it up pretty good. Equal to the other side now..

good to hear positive results ! how much did you have to remove, and how deep did you have to go before you got the housing to your liking ? any pics ?

Hard to say how much, it didnt take long with that bit i used, the shavings accumulated quick..