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Quote from: geraldchainsaw on 2024-04-17 18:19OK, CHANGED OIL, used O'Reillys full syn 20 weight ...Full synthetic is always your best bet. Don't know why you decided to use 20 weight but I'm pretty sure that you should be using 5-30 or 10-30 oil. You didn't do your engine any favors by using 50 weight oil, that's really bad for cold starts. A 'cold start' doesn't mean a start-up in the winter. It's a start-up any time that an engine is started when it's not already warmed up from being run for a while.
Quote from: thomasso on 2024-04-20 11:29Its very hard to tell much about a Y block by pictures. This one looks to me like like maybe 55-56 Mercury. As I recall Mercury as having Yellow valve covers. And the teapot 4bbl was not used after 56 except on E and F code cars. 312s used the flat top exhaust manifolds at least in 57. Of course I could be all wrong.I believe you're right. My thought was a 56 Mercury! IIRC the Teapot signifies a narrow bolt pattern "A" manifold.