Can't mag. aluminum is non magnetic. But you can pressure test. Darkstar -----Original Message----- From: id [mailto:ionicdesign@xxxx] Sent: September 11, 2002 1:00 PM To: dmcnews@xxxxxxxxxxxxxxx Subject: Re: [DML] Head assemblies > also have the heads magnifluxed (i think thats the correct > spelling and name). this process will find out if they have > small cracks in them before you have them resurfaced so they > wont leak. i had a 300 in line ford 6 cyl head magnifluxed and > resurfaced for $75 10 years ago so i think it should be around > $150 a head now for these two processes. > > mark [moderator snip]