MikeS Posted January 17, 2022 Report Share Posted January 17, 2022 The four bolts that attach the intake to exhaust manifold, all broken. Plan to heat w/oxy/acetylene. How much heat can intake take w/o damaging the casting. Plan also to use candle wax and kroil. Thanks guys. Quote Link to comment Share on other sites More sharing options...
Sniper Posted January 17, 2022 Report Share Posted January 17, 2022 It's cast iron. You can get it red Quote Link to comment Share on other sites More sharing options...
MikeS Posted January 17, 2022 Author Report Share Posted January 17, 2022 Thank you! Quote Link to comment Share on other sites More sharing options...
47 dodge 1.5 ton Posted January 17, 2022 Report Share Posted January 17, 2022 (edited) Recommend drilling those out if you are saving the manifold. Note: The bolt hole side walls are very thin, and brittle. Remember, you don’t need to split for removal, can do those four on a bench. Edited January 17, 2022 by 47 dodge 1.5 ton 1 Quote Link to comment Share on other sites More sharing options...
sidevalvepete Posted January 18, 2022 Report Share Posted January 18, 2022 Good advice above. Others probably have more wisdom to add. My first attempt at this was a fail.......bet a few others have done the same. Good luck ? Quote Link to comment Share on other sites More sharing options...
Young Ed Posted January 18, 2022 Report Share Posted January 18, 2022 If you have any sticking above the surface you can cut a slot and hopefully use the heat to get it lose and then remove with a screw driver Quote Link to comment Share on other sites More sharing options...
Dodgeb4ya Posted January 18, 2022 Report Share Posted January 18, 2022 I have done a lot of these broken off 23" intake manifold bolts. They can be tough to get out whether drilling out, soaking for a day etc. I have the best luck mig welding a nut to the broken off bolt. Letting it sit a bit with acetone and thinner mix then un-screwing the broken off bolt and welded nut. Sometimes still the bolt won't come out so I use the blue tip to carefully heat the manifold in the area the bolt threads are to a orange color fairly quick....the bolt will come right out. 1 Quote Link to comment Share on other sites More sharing options...
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