Jerry Brown air_cooled63 at yahoo.com
Wed Jun 10 18:43:12 EDT 2015

The only difference in oil pans was one style for the early's and one style for the Late's. The late had larger flat bolt area and used a bolt with a fastened lock washer giving it more gasket sealing area.  I use the late pan as long as I have one.Jerry Brown 

     On Wednesday, June 10, 2015 11:20 AM, Bob Helt via SCG-list <scg-list at corvair.org> wrote:

 Again, as I remember, there was a tech bulletin on this subject. I will try 
 to locate it but it will take some time to do so because of my current 
work  load. I believe that one sealing change was done for 1966 as the proving 
grounds  report had a favorable statement concerning all the rust on the oil 
pan as being  a sure sign of no oil leaks for that year.
Bob Helt
In a message dated 6/9/2015 8:25:24 P.M. US Mountain Standard Time,  
scg-list at corvair.org writes:

Yes, I  have noticed this also in my stock of used pans.

What years are  which?

Frank DuVal

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