Posted by Tom Fleming on September 09, 2009 at 16:06:21 from (67.20.240.67):
In Reply to: 10-20 manifold stud posted by Tony S. on September 08, 2009 at 21:20:05:
I just wanted to follow up about using heat. Yes, cold cast iron does not respond well to intense heat. However, I have sucessfully removed bolts and broken bolts using Mr. Heat, aka the "blue" wrench.
The key is to gradually heat the cast iron mass, and keep intense heat localized to the bolt itself. I have heated engine heads in the oven to 300 degrees, and then used a torch to heat the bolt itself.
Above all, what ever method you use, patience trumps all. It took years for a bolt to rust solidly into a cast iron block or head. 15 minutes will not remove it without great risk of damage.
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