Seems like once the chatter is gone, it would be easier to kill the engine right then in there and then do the preload with no mechanical movement?
Yup.
Preload has to do with keeping the lash in place for lifter bleed down essentially a dry startup?
Nope. Preload is to assure that the valvetrain still has no lash even after heaps 'n' piles of miles (and therefore wear.)
Setting preload could be a "life of the engine" sort of deal. Something else on the engine should fail before the wear removes all the preload and the valvetrain clatters.
Do you want to set the preload on all eight rockers in line at once or do you want to do the preload on each cylinder with the one cylinder time or one valve at a time .
When it's me, I get all sixteen tightened to "zero lash" and then tighten all sixteen to whatever preload I intend.
Eight at a time would be fine, too.
I was told today by a Chevy guy I know run 10/40 conventional and dump That Mobil 1 syn that I just put in.
No.
You use a 1” hole saw bit ?
Measure your socket that fits the adjuster nut. The closer your hole saw is to the exact size required plus a touch of clearance, the less oil will escape.
As the hole gets closer to the socket size, the position of the hole must become more exact. The goal is to use the smallest size, positioned perfectly...and since few of us are that good, a bigger hole becomes less-critical for placement.
Will 96-98 vortec covers cross over to a tbi head ? And bolt down If that’s all I can find for a dummy splash gaurd
Yup. I've heard that the PCV baffle size is smaller/narrower on the Vortec covers, so the reverse (TBI covers on a Vortec) might not be true.