PAUL161 said:Doc, Believe it or not, the tool probably worked very well in the old Ford V8 flat heads, as you had to reach in the valley under the intake manifold, after it was removed of course, to put the spring compressor in place. There wasn't very much room to do this. I don't think I'd try to use it on a modern engine though. Might cause a lot of pain. Mentally and physically. PJ