I think some of you hemi experts can solve my problem. I was changing plugs on my 68 rr hemi and encountered oil in the spark plug tubes. Possibly I did not have the plugs tight enough? Or am I missing some o ring or something else? I have Autolight plugs and stock hemi valve covers. Is this normal or do I have a problem and how can I fix it? Thanks in advance.

posible the seals in the tubes are leaking..if you think the plugs were loose, then clean the oil out and off the boots.. tighten the plugs, see if it still leaks.. if it doesnt then thats your problem... if it still leaks then the seals must be leaking

cut compression washers off plugs to seal them, torque to 25lbs iron heads

REMOVALEight of the 16 spark plugs are located under an ignition coil; the other 8 are not. If spark plug being removed is under coil, coil must be removed to gain access to spark plug. Refer to Ignition Coil Removal/ Installation and observe all CAUTIONS and WARNINGS.Before removing or disconnecting any spark plug cables, note their original position. Remove cables one-at-a-time. To prevent ignition crossfire, spark plug cables MUST be placed in cable tray (routing loom) into their original position. Refer to Spark Plug Cable Removal for a graphic.Before installing spark plug cables to either the spark plugs or coils, apply dielectric grease to inside of boots. 1. Remove necessary air filter tubing at throttle body. 2. Prior to removing ignition coil (if coil removal is necessary), spray compressed air around coil base at cylinder head cover. 3. Prior to removing spark plug, spray compressed air into cylinder head opening. This will help prevent foreign material from entering combustion chamber. 4. Remove spark plug from cylinder head using a quality socket with a rubber or foam insert. 5. Inspect spark plug condition. Refer to Diagnostics and Testing - Spark Plug Conditions.INSTALLATION 1. Special care should be taken when installing spark plugs into the cylinder head spark plug wells. Be sure the plugs do not drop into the plug wells as electrodes can be damaged. 2. Start the spark plug into cylinder head by hand to avoid cross threading aluminum threads. To aid in installation, attach a piece of rubber hose, or an old spark plug boot to spark plug. 3. The 5.7L V-8 is equipped with torque critical design spark plugs. Do not exceed 15 ft. lbs. torque. Tighten spark plugs. Refer to torque specifications. 4. Before installing spark plug cables to either the spark plugs or coils, apply dielectric grease to inside of boots. 5. To prevent ignition crossfire, spark plug cables MUST be placed in cable tray (routing loom) into their original position. Refer to Spark Plug Cable Removal for a graphic. 6. Install ignition coil(s) to necessary spark plugs. Refer to Ignition Coil Installation. 7. Install spark plug cables to remaining spark plugs. Remember to apply dielectric grease to inside of boots.

With factory parts, some oil will appear on the plug and be visable in the bottom of the tube since it is under the oil level in the casting.
The engine will smoke for a couple of minutes as well after start up /plug change.
There is a couple of people that make a fix for the problem , which is basically a sleeve that fits in the casting and seals to the OD of the tube..
I am running Autolite plugs and leave the compression rings on.

Use the Milodon tube inserts with the ID oil rings for the tubes, also the compression rings cut and chew into the tubes bad. I recommend removing the rings also, the flat on the plugs will seal to the tubes. With out the inserts in the heads their is a gap around the tube after installing.

logan426

some info here here