do you want drawings of rc ob's, or full size ob's? i might be able to help with the big ones.
give me acouple of days, i'll let you know.
Not sure if it helps, but here are a few good drawings with measurements. You can get creative with the zoom feature and get it pretty darn close to 1:1. You didnt say what size engine you were looking for, but these are 3.5cc
http://www.mecoa.com/kb/89/8907-3view.pdf
http://www.mecoa.com/kb/89/8935-3view.pdf
This is for a 11cc and higher.
http://www.mecoa.com/kb/67/kb100ob-3view.pdf
~James
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