These look pretty handy:
http://cgi.ebay.com.au/PORTING-TOOL-x3-LONG-SHANK-Die-Grinder-head-work_W0QQitemZ4615207160QQcategoryZ43808QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

But I don't want to fork out $150 for em.. Anyone know if there is a cheapo version of these available? I can make do with what I've got, but something like this would make it quicker..

Can't believe that price, $150 indeed!
I find the shorter carbide ones are pretty good, I paid $20 or $30 each a while back.

If you buy these long ones, don't run them fast- it's very dangerous. They can whip off centre and break your air grinder or dremel, or even injure you.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I have a couple of the shorter carbide ones... they work excellent! Just thought the longer ones would be quite handy, except paying an extra $100 for a longer stem seems unresonable..

When you say not too fast, what speed are we talking? Not above 15,000?

I'd limit it to 7000. It will still cut OK at that.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

You would run these in a dremel?

I thought it would burn them out? Does it work well?

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

I don't think they'd fit in a dremel would they? Probably need a 1/4" chuck.. Dremel's are pretty tough though, I've put mine through a lot.. But I've got a electric die grinder aswell.

Is there any advantage between electric or air dir grinders?

When I say `Dremel' I mean a bigass one like GR uses.. not sure if that's what brand it is.
Mine is an Ingersoll Rand die grinder (24,000 rpm)- a bit slow for dental work but it removes metal way faster than my Black & Decker drill used to!

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

The electric one is the bees knees for cast iron work as it has heaps more torque then the air die grinder.

Carbide tools are for cutting not grinding and if you dont apply enough pressure to the cut it will rub the edge off the tools in no time.

For porting an 80 or 40 grit flap sander can give very nice removal feel and speed. $150 will get you a lot of sanding pads