360 main cap question

Hey guys, I'm assembling my 73 360 engine and during the crank install I noticed the rear main cap has a slot cut in it . It's about 1/8 inch wide and 1/8th deep that runs from the inside edge of the cap to the outside edge. Is something supposed to be in there? When I took it apart it looked like a bunch of crud in there. Any help would be appreciated. I should have taken a picture. Thanks, Dave
Author: admin