开云体育

When I was running the 327 in Tinkertoy I pulled the heads after around 75,000 miles and found one exhaust seat hammered about 3/16" into the head. I replaced all the exhaust valves as well as intake and exhaust seats and guides. After another 75,000 miles I tore the engine down when I replaced it with the 383 and found all the valves and seats looking good still. Definitely worth it if you're putting a lot of miles on it.

John
'56 Pickup TKER TOY
Graham, Wash.


On 3/31/2021 6:32 AM, Pruit Ginsberg via groups.io wrote:
> It depends. If the engine has been run on leaded gas and the seats > are not cut, there is enough lead embedded to continue running a lot > of miles on unleaded gas, But, if one cuts the seats during a valve > job, then the wear starts . About 12,000 miles and the wear is so > bad there is no compression. I think there are several more factors, > like how hot the valve gets and spring pressure (new ones) , but > Both the rear cylinder exhaust seats were gone by an eighth of an > inch at 12,000 miles on my Chevy V8. Before that, I had run > probably 100,000 miles on unleaded . > > With weak springs and low miles you probably could get by. Pruit > >> On Mar 30, 2021, at 10:24 PM, Curt Holland <curt@... >> <mailto:curt@...>> wrote: >> >> Pruitt, Agree on the high zinc oils for flat tappets....a must >> have. However, I don't agree on the hardened valve seats. I have >> several vintage car engines that are doing just fine on their >> engines I rebuilt, and the valves are seated against the original >> cast iron seats. There has been no bedding, seating, erosion of any >> valves into the cast iron like was claimed years ago that would >> happen when tetraethyl lead was removed from fuel. Every few years >> I check valve clearances, and clearance is staying steady, meaning >> nothing is happening. I've put thousands of miles on these engines. >> The milling of blocks/heads to make room for hardened seats is an >> unnecessary risk to install something not needed..... especially >> for engines that will likely only ever see a few thousand miles for >> generations to come. Just my opinion. Curt >> >> >> >> /Sent from beautiful Bessemer City/ On Mar 30, 2021 6:28 PM, "steve >> boyer via groups.io " >> <flash7313@... >> <mailto:flash7313@...>> wrote: i don't know where >> you are located, but if it's anywhere near southern nj i know of a >> place that can do a flathead 226 rebuild well and i thought his >> prices were reasonable. did mine 4-5 years ago and it runs like a >> champ. steve >> >> On Tuesday, March 30, 2021, 03:02:50 PM EDT, Pruit Ginsberg via >> groups.io <pruitg@... >> <mailto:pruitg@...>> wrote: >> >> >> Most likely you will need to have yours rebuilt. It should have >> hardened valve seats if you did not install them last time. That >> procedure may be a problem with valve in block engines. Maybe >> someone who reb uilds flat head fords? Yes, it will be expensive. >> And use oil with the lubricant for flat tappet engines. Gibbs >> racing oil is one. Pruit >>> On Mar 30, 2021, at 11:57 AM, Dan Beeker <debeeker@... >>> <mailto:debeeker@...>> wrote: >>> >> Don't know where you are located. In the midwest, Jasper Engines >> has a >> >> >>> good reputation for remanufactured engines. Expensive but have a >>> good warranty. If they can do it you will likely need to ship >>> your old engine to them as the demand for flathead 226s is not >>> large. They generally work through local shops. It's getting hard >>> to find mechanics/machinists that have experience with old >>> engines. >>> >>> Dan >>> >>> On 3/30/2021 9:57 AM, Skip Owens via groups.io >>>