Posted by JRSutton on September 22, 2011 at 06:04:50 from (75.130.109.233):
In Reply to: Exhaust Manifold posted by holmesw on September 21, 2011 at 18:28:28:
Agreed with others on the timing.
However, the loudness could certainly be due to the crack in the exhaust manifold, not some other engine issue. So it's hard to point to that as a symptom of a timing issue.
Check the timing and distributor cam of course, as others have suggested. But I'd also recommend adjusting your valves.
If your distributor's good, valves are adjusted, and you're still having trouble, I'd move on to ignition components - points, condensor, etc.
Basically, I'd use this as a good excuse to do a full tune up.
And one final note - how long has the manifold been cracked? And where is it cracked?
It's possible for the crack to cause trouble with your valves, especially an exhaust valve - they can get burnt out.
It's good that your compression numbers are solid, but even so, I wouldn't run with that manifold for too much longer.
It's easy to say "just go buy a new one" but if funds are tight, I would, at an absolute minimum, goop up some jb weld on the crack to seal it.
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