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it take 15 to 20 hours if you know what your doing per head - and face masks are a must good venting and a special room also helps ear protectors are also a must and 3 / 500 bucks for high speed carbide grinding bits and BTW the compressor you don't have will be a must - hacking up cast iron dust on your desk at school will get you a better grade down south tho -- the reason most don't do it it takes too long and as bill said with out years of experience and a flow bench and motor dyno to show how bad you have done the cars motor will be a disaster -- just thought you might want to know -- jz
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