Northstar Engines and System Technical Discussion Discussion, Valve Train Question in Cadillac Engine Discussion; Ok I see a lot of discussion regarding sticky lifters. I was always under the impression that OHC engines didn't ...
Are you familiar with the inside of say, a small block chevy?
The lifters ride on the camshaft, and the pushrods sit into the little "cup" on top.
On the 93-99 northstar, the lifters still ride on the camshaft (err... Should I say the camshaft rides on the lifters???) But, the valve stems sit in the little "cups".
On the 2000-2004(?) northstar, it does indeed have rockers. I can't remember exactly how those work. I believe the rockers have a pivot on one end, a roller bearing in the middle that rides on the cam, and the lifter assy on the other end.
When you look at Ranger's picture, on the left is what GM calls a lifter. The top is a ball (and the follower or rocker)has a socket over a hollow cylinder filled with engine oil just like a common lifter. Most foreign cars call them "hydraulic elements", or "zero lash adjusters". And of course the cam rides in the head and pushes down on the roller which pushes down on the valve. I don't know why GM calls them lifters, they don't lift on any of the N*'s.