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Re: Can hole in exhaust manifold cause burnt valve and missing?
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Posted by Bob M on June 14, 2001 at 05:03:04 from (192.232.119.194):
In Reply to: Can hole in exhaust manifold cause burnt valve and missing? posted by Will on June 14, 2001 at 03:34:38:
I agree with The Red and Bill. One more possibility however: A hardened exhaust valve seat (if the motor has 'em) worked loose. This will cause cause the valve to burn in short order. I've encounted into this a couple of times - though only on engines with aluminum heads. For what it's worth, we've got an M and a pair of 6-cyl Olivers, all with cracked and leaking exhaust manifolds. They've accumulated hundreds of hours of work at full load without a hint of valve problems. The slightly reduced exhaust back pressure caused by the leak has no bearing on valve burning - if anything it gives the motor a fraction of a HP more power!
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