Hi, I'm the guy who used and recommends the washers for the whipple mount.
I can't tell you what size they are because I had them in a coffee can, you
know. I can tell you that I used one flat and done lock washer on each
bolt. They are not sloppy. They "just" fit. If I were you, I'd go to a
hardware store and buy an assortment. Next, lay on the floor and hold the
mount cap in place. Note the space and guesstimate the distance. There's
no big deal. If you don't like the fit, just change them again. Remember,
if you don't add enough, you'll still be better off than none at all. If
you add too much the mount may be sloppy. I believe the lower mount
controls upward engine movement which occurs during acceleration.
I got started on the idea from worrying about snapping those 13mm bolts. I
figured there must be a reason. When I removed the stock mount, I noticed
there was no stress on that cap and thus the bolts. Next I held the
whipple/cap in place and noticed approx. 1/8" gap between the cap and seat.
I concluded the nuts would draw the cap into place by: 1. bending the cap
2.deforming the whipple. Both of these actions would place a fare amount
of stress on those 13mm bolts. These bolts are only designed to hold the
cap in place. Hence the washers.
Sorry so long,
TomV, 1hr whipple install edition
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