After finding cracks on my 4, I think you'd better take a look at what I found on further investigation! http://www.Jedtek.biz OR scroll down the page to find the photos in a new post.
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The site is hit or miss. I got to it once and was able to view a photo or two but not others.
His 1987 RV-4 has cracking at the motor mount firewall brackets.
isn't there a SB or mod that addresses early RV-4 motor mount braces?