dip stick leak

I have a 1977 f-150 custom and the guy before said it leaks oil out of the dip stick so he plugged it with a bolt. Could this cause a bigger problem? What is causing the oil to leak out of the top of the dip stick tube? Any help is much appreciated.

well, thanks for the help guys. i just took it to my mechanic and stood their and listened and "uhh, yeah"-ed like a woman instead putting omething in that would help narrow it down. you guys are awesome, i couldn't do it without you. (i'll just anything in the firebird forum, they answer questions)