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I don't know, the surface where the serial number should be doesn't appear to have any material ground off. Maybe it is a replacement case, which could be bought from Porsche without any serial numbers. I've seen other photos online that look like this.
Is there an engine type number on it? There is a flat surface just out of view near the bottom of your first photo. On a 75, the type should be 911/4X, where the X digit varies depending on the whether it is a US car, a 911S, a Sportomatic, etc.
you guys really think so ? looks to me quite obvious where the surface where the s/n goes is different to the rest.
My bad, forget what I said....I didn't look at picture close enough. Definitely machined off numbers and not a clean job so someone wanted engine number to disappear for not good reasons
just looked at other engines and these numbers are very deep, this doesnt look like someone took of 2 or 3 cm...
That's what I was thinking. It also looks a lot like this blank case photo from an old Grady Clay post on Pelican:
Still wondering if there is an engine type number on the horizontal surface (where the red arrow is pointing). If there isn't, then I would think it supports this being a factory blank case.
Looks to me like an unmarked factory replacement case that some jack **** spray painted silver. And then someone scraped off the silver paint trying to find a serial number.
Bottom line is with a worked on engine you simply can not tell, the only way is to examine pistons and cylinders. Im pretty sure they need to be measured and therefor off the car.
BTW you only need to take a coiple of MM not s/n. And its easy to add in some aluminum and grind it down. I think that grady clay pic has had aluminum added, you can see where it was added. Anyhow means nothing.
Steve Weiner might know some tricks to figure out displacement.