cracked manifold
Posting Guru
Joined: Nov 2003
Posts: 1,071
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From: Concord, New Hampshire
um?, you should preheat a manifold or any cast peice for that matter before welding, (its stronger in the end) then you tig it with a rod just for cast iron, then it must cool SLOWLY, the weld shop i work at dose cast work alot, but it gets expensive and its never a guarentee, ive seen some stuff go into the cooling can, (a trash can with a special insulation and another can within) to cool it slowly and when it comes out its got another crack from the intense heat of welding, the best fix is to replace it with a new one, there kinda expensive, but thats what i did when mine on my 351w broke in two, for 90 bucks it was gonna cost more to have it welded and risk it not working again.
Freshman User
Joined: Apr 2004
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There are 2 methods to welding cast.You just explained the first one and the cold method is the second one.I have welded on quite a few cast products my self,and used both methods.When I use the COLD method I don't wind up chasing as many cracks ,it seems.The special insulation you are talking about is probably vermiculite,the stuff is light as a feather,can withstand direct contact with flame,and insulates for a very long time.And best of all you can purchase this little item at a gardening center,because it is also used in flower beds.
Posting Guru
Joined: Nov 2003
Posts: 1,071
Likes: 1
From: Concord, New Hampshire
yup thats the stuff, i didnt realize the cold method was a method, i was told you did it by heating it up and that was the proper way, but im sure its 6 one way half a dozen the other.
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Joined: Jun 2004
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Originally Posted by TexasRedneck
There are 2 methods to welding cast.You just explained the first one and the cold method is the second one.I have welded on quite a few cast products my self,and used both methods.When I use the COLD method I don't wind up chasing as many cracks ,it seems.The special insulation you are talking about is probably vermiculite,the stuff is light as a feather,can withstand direct contact with flame,and insulates for a very long time.And best of all you can purchase this little item at a gardening center,because it is also used in flower beds.
I read your post on the 400m and have some ???s regarding that edelbrock intake. email me at mboogie76 AT hotmail.com, My pc got wiped and my user info is reset towhere I am unable to PM or Email. stoopid rules, sometimes...
Thanks!
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