Welding Furnace - Preheating aluminum heads

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I'm looking for a furnace or plans for building a furnace for preheating aluminum cylinder heads for TIG welding.  I have a small shop without big bucks to spend on a real furnace.  Does anyone have any ideas?ThanksMark
Reply:Cheap and dirty would be a propane grill.DennisThermal Arc 185-TSWMillermatic Challenger 172VictorO/AAtlas Craftsman 12 by 24 LatheEsab PCM-875Wholesalem Tool Mill-Drill
Reply:I thought about building a propane powered box with some firebrick inside.  I have a thermocouple measuring meter, but I might even be able to buy some furnace themostat controller for pretty cheap.  All I need is about 400-500 degrees.
Reply:i fix/modify aluminum heads all the time..very rarely pre heat one......zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.