Looking for line drawings of a bare engine block

Have to do a sign for my buddy's machine shop and he'd like some kind of line drawing of something vintage. Does it ring a bell anyone remember seeing something??
Thanks for any leads

 

This is kinda what I'm lookin for

 

There's a thread going on using an overhead projector to duplicate or enlarge an image. You could use whatever you want with that.

 

I hope this helps
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