I have always taped the holes in the front main cap to attach the timing cover. 3/8'-16 I have found that header bolts (cap screws) work the best. They have a 7/16" wrench size for ease of attaching with a wrench or socket....Good Luck


216.158 MPH 12-Port 302 GMC on 70% 171.0 MPH 302 stock head on gasoline 7 years later