Thanks guys...I hadnt considered that there may have been a plug shipped with the engine....It was already mounted in the '52 chevy panel truck when I bought it. BTW the hole is open into the oil pan. I went on Summitracing site and asked their live help. They have a small plug (Yep---looks just like a freeze plug) specifically for dip stick holes. They want $10.00 for it so I probably will try to fabricate something....I'll let you know what I end up with.