Quote:

This 318 block is an 88 Hydraulic roller, I noticed when I tore it down there was not the typical Plug in the #5 passeage that restricts the oil from going directly to the lifters...



Somebody just forgot to put the plug in in a previous life of the engine. It's a 9/16" cup plug ~ .572-.573" OD is the appropriate Pioneer brand cup plug (they offer 9/16 plugs in multiple OD's, 9/16" does not always mean .5625" apparently to plug companies)