Registered: 09/12/03
Posts: 14035
Loc: Fort Worth, Texas
I think the head gaskets are fine. Reason being either cyl 1 or 5 would also be low.
Ok so now we know there is a compression issue on #3. Poor some oil into the cylinder and re check the compression. If the compression rises then it's a ring/cylinder issue. If the pressure stays the same it's a valve issue.