T;

I ran across it when doing a tune up in the 70s & thought like you at the time. Since that engine only came in a few cars; I haven't heard of it till today.

Only a Chverolet buff would ever see/think of it.

Be a great question for a Auto Shop exam.

Happy trails. \:\)

John M., I.I. #3370

"There are no shortcuts to any place worth going". -Anon