FWIW- At half lift, the line that should be square to the valve centerline goes from the rocker's pivot center to the roller tip's center- not to the tip of the valve. This gives minimum "pattern" width, and also gives maximum valve travel at full lift. Note that this may not center the "pattern" on the valve tip- but that's not a concern.
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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons?
... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967)
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