The cam timing is retarded. A long as your pushrods are stock length, There is plenty of travel in the lifter to accommodate the bottleneck studs and locknuts even when heads are milled. The shoulder on the rocker stud prevents you from over-adjusting and collapsing the lifter. If intake valves were hung open, you’d hear it through the intake tract either as backfiring or a pfft- Pfft-pfft sound from the open intake valves allowing compression to leak past the valve guides when cranking the engine over.
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Triple Black 1971 GTO
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