Hi Jeff, I have the oversize valve, so I have to index if I use those plugs. I figured I could stack a few washers if I got the .012s to get the orientation right.
One consideration that may or may not be a problem, is that if I use thick washers (rather than thinner ones) to get the orientation, I may get carbon build up on the exposed threads. If I go back to a regular plug, it would knock the carbon loose and a chunk could get lodged under a valve. Back when I changed my rings from Borgo to Hastings, (because after spending $6,000 on a motor rebuild, 30k miles later I was STILL using a quart of oil every 200 miles!) there was enough carbon/burned oil build up on the seats, I had to have all the seats cleaned up. This followed doing a leak down test, when #2 was pressurized, the pressure came out of the plug hole in #3. That was bad enough both I and the mechanic concluded I had a wrecked head gasket. It turned out the gasket was fine, the pressure was going past the rings and valves. With the head off, it was at that point I pulled the cylinder liners and took them to Terry Tinney in Livermore to get them torque plate honed and to have the head reconditioned. Since I'd had the head done at Norman Racing (Dan Marvin and Company) to the tune of $1000, the only parts I replaced were the stem seals, everything else was fine. Stevan Thomas In a message dated 7/11/2010 7:59:06 PM Pacific Daylight Time, [email protected] writes: > I've never done this, but my understanding is that you'll need the > assortment. > > The idea is to get all the electrode tips on the plugs pointing a > certain way. Out of the box, you have no way of knowing which way the > tips will face. > > So, you may need you move them 1/4, 1/2, or 3/4 of a turn more or less. > > I really doubt it's worth the effort on a street car ... > > OTH, I could be completely wrong about all this :-) > > Jeff -- to be removed from alfa, see http://www.digest.net/bin/digest-subs.cgi or email "unsubscribe alfa" to [email protected]
