I used the cardboard to mark and drill the outermost bolt holes.…

I used the cardboard to mark and drill the outermost bolt holes. Then I made relief cuts along the bottom to clear the head bolts and spark plugs. Straight cuts got most of it but I cut wider angled slots to get at least 1/8" around the ends of the spark plug boots.

Owner caption February 2010 · Photo 70 of 432