At the far end of the spectrum might be a leak
IN the intake manifold?
IN the intake manifold??? Yes.
My mate with a '37 Super Eight(320c.i.) had this happen and I've seen it happen to a couple of other Packards.
Because the exhaust maniold is "coupled" to the intake manifold it resulted in hot exhaust gasses burning through the walls of the intake manifold. Solution was to sleeve, ie "force fit" some stainless stell tubing, I think it was 1&1/2", memories of 15 years ago mend to fade.
Holes were blown through the walls of both barrels of the intake manifold, pic's below
IIRC, Ken P had a similar problem, with his '37 115 or 120.
?
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