Brent, does anybody still offer FE solid flat tappet lifters that look like a shell lifter, but with upper pushrod seats so you can use regular length pushrods? TRW , Speed Pro/Sealed Power used to offer them, years ago, but I believe all they have now are the heavier dumbells. That said, the dumbells have worked pretty good in my 427 and many 428s over the years.