Hey Hambers . I will finally be able to get to the DMV tomorrow to get my 47 Coupe legal. It has a stock 1966 283 2bbl. My fuel gage reads 3/4 full. PO said he used additives to the gas. I want to fill it up on the maiden voyage tomorrow. So, my question is should I be concerned with valve seat recession ? Marvel Mystery oil ? Or should I just drive it ?
Have you driven it anywhere?? I would at least do some laps around the neighborhood to shake it out prior to your drive to the dmv or did I not understand your question.
flatford39. Not taking the Coupe to the SOS. I will drive it around the neighborhood before any longer trips. My question is concerning many reports in the early 70s showing severe valve seat recession in engines with non hardened seats. The 283 in my car will be driven like the old man that I am. I have ran many pre 70s cars on no lead with no issues.
I’ve put 10,000 miles on my y block 56 and for my peace of mind add 1oz of Marine Sta-bil with every tank and it has the original valve seats. There is a lot of info on the web and here on using today’s gasoline. Most recent I’ve read not to use any higher octane than needed.
The likelihood of seeing any valve seat recession in your lifetime is remote. If you were doing high speed, heavy footed driving the recession could be more significant after many thousands of miles but for your driving schedule don't worry about it. Enjoy
Takes a lot of heat to cause seat and valve face wear and recession.... heavy loads, trailer towing, sustained high speed driving(high engine rpm 4000+ constant). Ordinary passenger car/ light duty truck use it is almost non-existent.
If the engine is is original from 66 the seats will be work hardened from the leaded fuel and as long as the guides aren’t worn and it’s tuned correctly you should have no problems. One of the problems is when guys grind the seats to much and make them to wide. And I’m with squirrel. Drive it and deal with it if there’s a problem. Then I would recommend hardened exhaust seats. And I have seen a lot of pounded out sunken seats and as said mostly heavy trucks or bad valve jobs. Sent from my iPad using The H.A.M.B. mobile app
Put some 87 octane in it and run it. Lots of stations are selling non ethanol gas here in tn. I don't know about up there.
Top off the tank with fresh gas and take it for a ride! By 66, the 283 was the low performance "dog" motor, don't need any additives, and if it wears the seats it will take thousands of miles. Run it and smile! Devin
I use a little MMM, for me at least it aids keeping the fuel from turning (kind of like stabilizer, but smells better).