Author Topic: differences in small block castings  (Read 2435 times)

sngoldstein

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  • Posts: 3
  • Mustang: 1966 convertible
  • Location: United States
differences in small block castings
« on: June 22, 2009, 11:24:39 PM »
I am building a new motor for my 66 and have a 90 block.  There are a number of differences in the castings.  I am wondering if anyone knows the purpose of what seems to be a vent hole in the left side of the bottom of the block into the crankcase.  There is a little notch for it in the oil pan gasket.  It's not in the 66 block. Does something go in there to keep water/dirt out.  Does it need to be plugged?  Thanks for your help. 

sngoldstein

  • Newbie
  • *
  • Posts: 3
  • Mustang: 1966 convertible
  • Location: United States
Re: differences in small block castings
« Reply #1 on: June 23, 2009, 08:13:55 PM »
Talked to a friend.  It's the dipstick hole for a rear sump pan.  I'll tap and bolt it.  Yeah, I feel like a fool.

 

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