SchwinnAlloySeven_GT5 said:From my experience, an engine that "whistles" or "chirps" is doing so because of a compression leak due to loose head nuts, unsealed head nuts, damaged head or damaged head gasket. You may have an intake or exhaust leak, too.
My first engine arrived with a damaged head and it whistled and chirped after 100 miles. After replacing the head and using automotive drain plug gaskets on the head nuts, it quieted down - until I fragged the crank bearings
Occasionally, my Grubee GT5 will let out a chirp, but it's random, and I haven't used the drain plug gaskets on it's head yet.