That works on engine blocks also. I have a concern with manifolds due to the
heat related expansion and contraction. The peening does work well on less
heat stressed parts. I have seen it used even without the preheat and lots of
peening with a fairly light hammer(chipping).

Dale Davies

TRY BRAZING.
robert keenan


Brazing may not work because of the 1800 F EGT.

Paul Lamar



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