Plus also, (correct me if I am incorrect), isn't the lead additives being discontinued? Go with the hardened valve seats. Æyn --- sosmi@xxxxxxxxxxx wrote: > Tom, no question, the heads should have hardened valve seats > installed, while doing the valve job. Just make certain, to > set-up the valve stem heights to original specs, otherwise you > could have problems with valve clearance, or push-rods.Your > doing it RIGHT. Ya'll have a nice day , Dave. > > -------------- Original message -------------- > From: tom higgins <thomash85715@xxxxxxxxx> > Dave: I have no intention of swapping these out; several local > shops have assured me they will treat them with care and make > them like new. The reason for removal is that valves are > deteriorating by the minute with the two year old fuel working > its way through the system. I found out too late what the > folly of leaving it in there has been. While heads are in > machine shop, fuel tank will be taking a deep bath too! The > source of confusion for me is whether to have my new heads set > up on purpose for modern unleaded fuel or make them "original" > and use lead additives. What is the collective view on that? > Thank you. --TH > > sosmi@xxxxxxxxxxx wrote: > Tom, I might have missed the reason for head removal, but the > heads on your engine ,should be retained at all reasonable > cost. Late model heads are good, but there are several things > that change. the 452 castings that were referenced earlier,or > any head 65 up, would change several things.These would be as > follows: Bolt-on rocker stands are gone,this could change > pushrod lengths, the valve cover changes to 6 bolt, the > combustion chamber is larger, which will reduce compression > ratio,and valve size would increase, which would be a detriment > to low speed torque. I would stick with what you have.Ya'll > have a nice day , Dave.. > > -------------- Original message -------------- > From: FltSgt@xxxxxxx > > > Hola Tom > > > > Even if you did have the Auto-Pilot, it would not effect the > time. > > > > It takes less time to remove the passenger's side head than > the hard one to > > get at one the driver's side. > > > > With either head you need to remove the battery connection > first. Then the > > intake, the effected exh manifold, the spark plug wires from > the plug ends and > > lay them else where in the engine compartment, the full A/C > bracket assembly > > and lay the compressor with hoses to one side, the effected > valve cover and > > rocker assembly. > > > > Now you can pull out the push rods and get to the task of the > head. Both > > heads have a bolt on the hidden rear side with sumthin on it. > By myself and > > common Craftsman tools this is a 4 hour task. If my MoPar > neighbor from across > > the street helps me, its a 5 1/2 hour task. If my brother > In-Law helps me its a > > 2 1/2 task. > > > > There is temptation to ream out the valve seats and to > install a set of > > valves that have a larger head diam. Do not listen to the GTX > or Road Runner > > Devil, for your Imperial weighs more. > > > > If by chance you have a set of 1972 - 1978 400/440 heads with > the last > > casting numbers of 452, use them. > > > > Uncle Rodger & Aunt Gabby > > Colo Spgs > > > > > > ----------------- http://www.imperialclub.com > ----------------- > > This message was sent to you by the Imperial Mailing List. > Please > > reply to mailing-list@xxxxxxxxxxxxxxxx and your response will > be > > shared with everyone. Private messages (and attachments) for > the > > Administrators should be sent to webmaster@xxxxxxxxxxxxxxxx > > To UN-SUBSCRIBE, go to htt > p://imperialclub.com/unsubscribe.htm > > > > > > > Everyone is raving about the all-new Yahoo! Mail. ----------------- http://www.imperialclub.com ----------------- This message was sent to you by the Imperial Mailing List. Please reply to mailing-list@xxxxxxxxxxxxxxxx and your response will be shared with everyone. Private messages (and attachments) for the Administrators should be sent to webmaster@xxxxxxxxxxxxxxxx To UN-SUBSCRIBE, go to http://imperialclub.com/unsubscribe.htm