Re: Valve train oiling
James makes a good point about checking for oil flow at the left front and right rear rocker shaft support. This is the reason for the different sized shaft bolts. As Prowbar states, the oil gallery that feeds the rocker shafts comes from the front and rear cam bearings, so keep in mind that excessive cam bearing wear or a spun cam bearing can cause poor oil flow to the rocker shafts.
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