1973 911 RS 2.7 original block - trying to find its car.

[Duc Hunter]

I have this block. It was pulled from a 1973 911 RS 2.7 by the Brumos dealership “back in the day” when those cars were not very valuable. They swapped in another engine vs rebuilding this one thanks to a problem unrelated to the block. It is in good working order. I am trying to do 2 things……

1. Validate that this is an original 1973 911 RS 2.7 block
2. Find the actually owner of the particular car that this engine came from, to get the car and engine reunited.

If you can help validate that this block what I think please do so.

I WILL NOT SEL THIS BLOCK TO ANYONE BUT THE ACTUALLY OWNER OF THE RIGHT CAR FOR THIS BLOCK.

[70SATMan]

Looks like a restamped case to me. Serial number appears wonky. Post a picture of the type
Number.

[Kevin Stewart]

Originally Posted by 70SATMan

Looks like a restamped case to me. Serial number appears wonky. Post a picture of the type
Number.

There is a test they do on motorcycle numbers that would probably work on this, I think its an acid test. Most numbers back in that day were hit or miss on motorcycles and cars as they were hand stamped.

[70SATMan]

Boss looks like it was ground down and the font is too small.

Duc should be able to post a picture of the type number

[Jezebel]

And the stars on each side are way to big when compared to other engines I have seen.

[911DP]

You should reach out to someone who knows these cars. Try James Patrick at Patrick Motorsports in Phoenix.

[AskewRSR]

Yes. Engine Number does look odd... and Ground down. Post a pic of Case Type..
Look at the Engine number and then Look down and Right.... it should be 911/83.......

[Matthew_VA]

that engine number definitely seems a bit suspicious. For comparison, here's a screenshot of a RS 911/83 case engine # on eBay.

[techweenie]

My guess is the original engine is in the car it was built for. The above comments about small numbers & overlarge stars on a ground down flat are correct, IMO.

Not accusing the seller of anything nefarious, but these things happen and parts take journeys...

Sold on BaT as a real 73 RS engine #:

[mepstein]

Whenever I’m in doubt about a stamping, I show it to my machinist. Besides seeing thousand of cases, he always points out things to me like how the surface was machined differently and its xx tenths ground down, etc. takes him all of 10 seconds to spot 3 different issues.
So many things happened to these cars and engines over the last 50 years.

[70SATMan]

Originally Posted by Duc Hunter

I have this block. It was pulled from a 1973 911 RS 2.7 by the Brumos dealership “back in the day” when those cars were not very valuable. They swapped in another engine vs rebuilding this one thanks to a problem unrelated to the block. It is in good working order. I am trying to do 2 things……

1. Validate that this is an original 1973 911 RS 2.7 block
2. Find the actually owner of the particular car that this engine came from, to get the car and engine reunited.

If you can help validate that this block what I think please do,,,

For reference, 6630860

[Don A.]

Ground down and restamped. Plain and simple. The car probably has a better restamped engine in it!

[70SATMan]

Yes but, would be interesting if it was the right type case?

[Don A.]

There should also be a date stamp in the flywheel area if I remember correctly

[blue72s]

Originally Posted by 70SATMan

Boss looks like it was ground down and the font is too small.

Agreed. And the stars are too big.

[Kevin Stewart]

I don't know guys, the numbers were always hand stamped, I have seen in some instances where they put each individual number on a jig if the jig was bent on slipped on a worker that didn't care could look like this.

Take a close look at the numbers on the thread pictures, the first two all look the same (probably part of the die), the next three numbers in all the pictures posted are all kind of staggered. and the last two are consistent with the others.

My research showed the stars can be of different size. One set of dies probably wore out quickly and they bought what was available, these were all mass produced (not a Ferrari they probably did the same thing). the newer the dies the crisper the number, the older would be rounder. The real thing to do is find numbers on a motor that were with in 20 plus minus that would tell the story.

how many motors would they punch a day, how many trans would they punch a day etc.

[Don A.]

Pad was ground down before it was struck with these numbers. Should be smooth and crisp with a casting mark toward the base. This was clearly tampered with.

[70SATMan]

Not that I need any convincing. A couple other examples that are IMO original:

[Showdown]

I have no horse in the race but those numbers, particularly the “6” just don’t match the known factory stamps in later photos. Close but not the same.

[70SATMan]

Originally Posted by Duc Hunter

I have this block. ,,,,,,

I am trying to do 2 things……

1. Validate that this is an original 1973 911 RS 2.7 block
2. ,,,,,

If you can help validate that this block what I think please do so.

Hey Duc. How about posting a picture of the type number? That’s the last piece to the puzzle that will fulfill item #1 and in the long run, helps the community.