About: http://webisa.webdatacommons.org/274054324

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	My suspicion is that since there are a couple of these in the engine block they decided to make the heater fit into the threaded hole.
http://www.w3.org/ns/prov#wasQuotedFrom	cadillacforums.com