The green pickle in the photo "could" be 20"(?). But, if memory serves, mine was more in the 16-17' range. Sorry, old post revisited.
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Attachment 76267
I found this from a region 4 race. A few region drivers were part of the Lowenbrau Six Pack Navy.
I remember that race well. Along with the go-cart races afterwards! Harley Wilson was a menace on the track as well as the water!