Reply to "Lifter Bore Clearance"

You can contact Johnson lifters and inquire about obtaining over-size tappets.

I recommend however installing the bushings using Wydendorf's kit, use 0.060" orifices, and be done with it. You don't need a machine shop or expensive "fixtures". What you'll need is a big drill (from the rental shop); patience; lots of cutting oil; a buddy to apply the oil and steady the block while you wrestle with the drill; lots of your favorite beverage; and ear plugs for you & your buddy. I recommend making it a two day job, 8 the first day and the remaining 8 the second day. Drill all the bores, clean out the chips, before you press in the bushings.

Hydraulic tappet, solid tappet, it won't matter. You'll not only fix the lubrication system, you'll hot-rod it. Your crank bearings will be appreciative. It makes a huge improvement and is definitely worthwhile. The idea that its only needed above 7000 rpm is ... well ... inaccurate. Afterwards sell the tools to somebody else & recoup part of your money.