On SB Chevys, we used to cut a slot in an old valve cover. Then weld a little (wall) about 2 inches tall around the slot. Screw it down, and no messy oil spraying while doing the adjustment, not using a gauge.
57 GMC LCF 370 55 John Deere 40-W 59 John Deere 430-W 2000 GMC 4x4 56 John Deere 420-W Pix on Photobucket
