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It’s always good to replace every seal in a motor when you’re tearing into it.  But, it seems that all the motors I’ve worked on the seals will start to leak within a few years.  The manufacturers had it down to the 3 year or 36,000 mile mark for components.  

So we replaced the crank seal in the timing cover.  I was given a tip to wipe the seal with laquer thinner which should help it hold a seal better for the race motor. Prior to that I was advised to wet the seal with a little oil.

Any engine builders out there who want to debunk either one of those suggestions? Feel free to post a comment. The one piece rear main seal of the Ford 302/351 always seems to weep a little.  Even within a few thousand miles.  I’m all ears for ideas on how to keep it dry.