I just got my 85 Coupe Deville back today, outfitted with a new cam and all new lifters and pushrods. It runs just great! So much more power. It also idles so smoothly I can barely tell it's even running.
6/16 lifters were BADLY worn--2 even had about an 1/8" gash in them.
3 lobes on the cam were pretty much flat. Another 6 or so were partially rounded off.
My distributor-drive gear (on the cam) was also badly worn.
This is just a reminder to check your oil frequently on this HT4100 motor! The guy I bought this car from drove around for a while with the "milkshake" oil after the intake gasket blew. This obviously did a lot of damage. My engine only has 35,000 miles on it.
Before I bought the car, the guy had a shop put in a new crank, bearings, and oil pump, but, for some reason, they neglected to put in a new cam.
I'm so happy to have my car back.