Helm, Inc. is in Highland Park.....call them and see if a customer service person will look. Usually, the manual covers all the typical factory stuff but......tell them you are having trouble finding info regarding the turbo engine and ask them to look in the table of contents.....OR go to a Pontiac dealer and beg to look at their 81 Firebird manual.......theirs is the same....printed by Helm.

The manuals are worth the price just because of the wiring diagrams.

mike in tucson