I did it my self, but I was lucky. none of the broken bolts were flush with
the head. i.e. their was some bolt sticking out to grip and work them out.
don't use exhaust gaskets, I did the first time, nothing but trouble. just
clean the head and manifold good. make sure they are flush with each other
when you reassemble. first time I used OEM bolts. last time I used grade 8
black from hardware store, still holding.
think mine is flush with the head. may try to drill it out next summer. it
doesn't bother me that much for noise. a friend told me i would cause the
cylinder to lean out, which i can't understand?? it is the exhaust manifold
Well, yes, but also remember the engine was designed to operate with a
certain amount of backpressure. With the exhaust leak, you've lowered
backpressure, which will let some of the A/F mixture escape during the time
the valves are overlapped. The lower the RPMs, the more pronounced the
effect of reduced backpressure.
Also a manifold leak will draw in outside air as the exhaust pulses go thru
the manifold. The oxygen sensor will pick up this extra oxygen and richen up
mixture to the point you could get a fault code.
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