Been aware of a blowing exhaust ever since recently acquiring my '71 C3, so got underneath today to try to source the leak......
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Turned out to be simple to find the leak(s) since they were present at every pipe joint in the system!
Particularly interesting was the fitters adventurous use of cardboard as a substitute for the correct gasket at the pipe joint to the header.......
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Seems I shall have to strip and reassemble the entire system .....
While underneath I checked for the source of the oily drips on the garage floor. The power steering turned out to be a very obvious culprit.....
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Hard to tell the exact source of the leak but it's likely to be the valve, the ram probably being contaminated by leakage from the valve. Either way, a stripdown and overhaul of the valve, ram, and pipework seems wise.
Looks as if I'll have plenty to keep me occupied for a while!