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exhaust spigot size?

  • 14 Aug 2017 10:01 AM
    Quote
    Message # 5028578
    Harry Roberts

    Hi, the threads on my cylinders where the exhaust header is fastened are all buggered up.  I measured them at 1.5" - 18 tpi.  But they're bad enough I wonder if there's metal loss and they actually should be a larger diameter than the 1.5".  Can't find the number in the R&O.  BTW this is for a 37 c.i. set of cylinders.  Can anyone please confirm what size the exhaust spigots were originally?  Thanks!
  • 14 Aug 2017 11:16 AM
    Quote
    Reply # 5028650 on 5028578
    Harry Roberts

    Never mind, found it!  1 9/16 - 18, 28B70
  • 15 Aug 2017 7:03 AM
    Quote
    Reply # 5030401 on 5028578
    Tim Raindle (Administrator)

    Well found, and thanks for posting the size for reference for others Harry.
  • 16 Aug 2017 11:17 AM
    Quote
    Reply # 5032420 on 5028578
    Harry Roberts

    ... and I will sheepishly admit it IS in the R&O, on the great list Carl Erik put together (page 49B).  I only needed to cross reference the part number 28B70, which I was able to find on the Walker Engineering site!
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