I don't see WD-40 doing much for preventing rust in storage. It doesn't work well at all for preventing rust on machined engine parts. It evaporates or drains off pretty quickly. Regardless, I believe it's more of a heat issue than it is a damp/wet environment during storage. Like I said in my previous post, I have never heard of anyone spraying headers w/ WD-40. I have heard of getting uncoated headers hot and then wiping them down w/ ATF. Doing that a few times supposedly will "coat" them and keep them from corroding.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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