Guys I cannot find the one and only 4 bladed fan I thought I had.

What is the outer measurement of one of these fans.

I need the measurement to help me toset the height of the engine in the hot rod chassis I'm about to start building.

BTW, any one got a good one to sell me???

Thanks in advance.

I think it's 17 1/2 inches.

Thanks, I found it after-all