Hi all and welcome to the B&S 15.5HP Model 28N707 head gasket page.
Here are the pics of the job:
Two views of the head showing sooted/carboned combustion chamber and head gasket breach in the thin area near the pushrod chamber
Overall view with head off
Two views of block with head gasket (with breach area), cylinder wall, and piston top
Block surface after head gasket removal. Breach area visible
Cleaned combustion chamber
Block surface and piston top after cleaning
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