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From what I understand todays gas will eat at the valve seats of older motors due to the fact that gas is no longer leaded. What I’m trying to figure out is if the valve seats in my head have been replaced with hardened valve seats at one point. After lapping the valves the seats are in surprisingly good shape. This is my daily driver and since I bought it I’ve been mixing lead additive into my gas every time I fill up. At 7 dollars a bottle of lead additive it gets pricy and I’d prefer to not do it if it’s not necessary. I included some pictures of the valve seats in hopes that someone can give me some insight.
Looks like the factory seats to me. Valve seat wear was a big problem back in the1970's before the refiners got a handle on making unleaded gas. It is caused by extremely high exhaust temps and micro welding of the valve to the seat. I doubt your engine will have any problem burning todays unleaded. Unless you do a lot of towing and are putting your engine under heavy loads. Actually, valve seat recession was more of a GM problem. The only Ford engine I ever took apart the had seat recession was a 429 Cobra Jet that had been driven by a teenager with a heavy foot and burning the cheapest gas he could find.
The only Ford engine I ever took apart the had seat recession was a 429 Cobra Jet that had been driven by a teenager with a heavy foot and burning the cheapest gas he could find.
Some of the 262 and 292 H/D engines as well as 361 and 391 had sodium filled valves from the factory. They help keep the valve cooler so keep the original valves if they are still in good condition.
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