| They make exhaust repair “ muffler patch “ that is I think sodium silicate , same as wood stove gasket cement . That stuff can fill voids but is not a bonding agent or glue . Permatex makes a “ copper” based rtv that resists I think 600-700 F , it is used by header guys the same way you use rtv . They swear by it . They take them off there is a residue after use that still seals . The claim is head surface right there does not get that hot . So JB might survive . And so flange of manifold not too hot too . But further down manifold it does , why slant six ( and in my case Packard ) crack , especially if it has overtorqurd bolts by guy who knows it all . Manifold bolts are left at certain torque so manifold can slip against head as it gets real hot and cast iron expands sideways . Overvtightening guarantees this crack will happen on leg shaped type exhaust like slant six . Been there . And slant sux has slip washers , design is ok but rebuilt engine guy tightens bolts too much . All the first year packard six ( 1937) tended to do this . In ? 38-39 they dropped the two end bolts totally and used long studs and big washers so manifold could slide slightly by design against block ( flathead) . Very clever — the long studs can sort of “ wave “ sideways I think chrysler knew this on early hemi , the complexity of fine and coarse threads and even brass nuts on manifold to get precise just enough clamp . By the way copper gaskets let it slide , used on race hemi . I dont think made for B block . Chrysler Also experimented with no gasket I think and light clamp . And this is maybe where the permatex stuff might help . All this from school of hard knocks.. j
-- Sent from my iPhone On Aug 10, 2022, at 11:10 PM, Ryan Hill <ryan_hillc300@xxxxxxxxxxx> wrote:
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