between bore Consistencies varying and lifters being slightly off from one to another sometimes it can be a little finagling to get in the happy range of .0015-.0020. That can sometimes be easily achieved by just switching around accordingly. When mic'ing a lifter it's a good idea to do so near the top 1/3rd and the bottom 1/3rd. Occasionally you'll get a cone shape one. Ive only cked a couple that were off far enough to where I wouldn't use them however has happened.

Correct and even while some of these online fly by night places claim they've done all that. Don't trust them. Size accordingly. I have a feeling they may have the same helpers as Walmart. Lol

http://www.johnsonlifters.com/AboutUs/Warranty.aspx

I use isky lifters and size the bores,,never a problem.
lifters help but its all in the prep,,basic bbc building 101,,nothing really special,,just specs,all easily googled.

Which isky ones do you use? I was just looking thru their bbc hyd rollers, I see they have a bushing style lifter in a hydraulic, looks interesting. Have you ever used the 3975's?

http://iskycams.com/cart/index.php?m...oducts_id=1468

I run the old red zone hydr.,there 9yrs old and I've used the 3970's and a few sets of the 3965's.