[Massive Type IV]

every cam is differemt. The base circle and gross lift make all the difference in the world.

What I did was install the bushings and line them up with the oil passeages exactly. Then use a mill to lower the bosses a little at a time till I had .050 .080 clearance with the cam bearings installed......The lifters are made to be ran with cams with less lift, just like the Germans use. the problem you encounter is getting the beveled chamfer correct in the face of the lifter after all the decking work.

When you are done the bore will need to be reamed for proper clearances.

What I found was that the oil passages in the lifter when used with a high lift cam do not align correctly with those in the bushing, and cause valve train lube problems.

In have many reasons fr not using these lifters anymore. I have 2 brand new sets on the shelf that I won't be using.