Help confirm this is a 73 RS engine

[RedmistinCT]

Have had this engine in an old track car since the early 80's. The shop that I got it from told me it was out of a 1973 RS that had a larger motor installed.

The type is 911/83
Serial # is 6630543
Injection pump # 0408 126 019

[silverc4s]

The serial #s usually have a star stamped at beginning and at end of the sequence. Also the number spacing looks off from usual.
It could be a restamp of a factory blank case.

[Flat6pac]

Years ago my brother has a 73RS that had a 2.8 rebuild done at RUF in Germany and the case was changed out for new, the stamp was for the engine number but the 911/83 was not there.
Just things done long ago.
Bruce

[silverc4s]

The engine serial number is earlier than the 73 RS SERIES serial numbers which start at about 63309xx and get higher from there.
From the Gruber / Konradsheim book, Carrera RS

[VW_NUTT]

It looks thinner where the serial number is stamped. I wonder if someone removed the original and made their own. I have looked at a few castings and they don't look like the one you have pictured. But I have never seen an RS motor either so I could be wrong. This is how my serial number looks. How do you flip a picture around?

[jpnovak]

Well. 911/83 is correct for an 2.7RS spec motor. 019 is a correct RS MFI pump. The serial number is suspect in its stampings but is in the range for an RS engine.

Could have been a replacement case that was stamped from an unnumbered part.

[djpateman]

The case should not be machined before the numbers are stamped, so I would assume the serial # was tampered with. Not to mention the missing stars.

[TRE Cup]

The number area on the alternator stand is most definitely not right. A replacement case comes without a type number , so that is not the situation here either.
Someone was trying to make a matching # to a car using another car's block.

[VW_NUTT]

I think the give away is the obvious removal of material by grinding/filing here circled in red.

[al lkosmal]

The type is right and the pump is right, but the serial number is a bit suspect.

regards,
al

[patz]

With the price of an original RS, an original engine would be a gold mine.

[mobius911]

The original engine (and I agree this serial number stamping is definitely not original) would have been in chassis 0528. A little info here.

[RedmistinCT]

Thanks everyone for helping me identify what I've got.
Cleary it's a bit of a mongrel.

Need to sell the car and want to describe the engine accurately. Not sure how to do that at this point.

[group911@aol.co]

The type numbers look like factory stamped. Maybe Dave can tell if the case casting numbers are consistent with the date range? Maybe some pics of the cylinders too?

[silverc4s]

Originally Posted by mobius911

The original engine (and I agree this serial number stamping is definitely not original) would have been in chassis 0528. A little info here.

Jeff is correct on the serial number. I missed a page in my manual scan of my Carrera RS book.
So there is a car somewhere that should have that serial numbered engine..

[RedmistinCT]

Case pic's:

[RSTarga]

do you have any pics of the complete engine?

[RedmistinCT]

It's in the car. Would a shot of the top be helpful?

[javadog]

One possibility is that the engine is a correct 911/83, but from a later year, and the engine number was altered to make it a "73 RS" engine. One from 1973 is worth more than one from 1974 or later. Or, maybe at one time this was installed in someone's 73 RS and they altered it to be the "correct" engine for their chassis. Might be worth tracking down the owner of the correct chassis for that engine number, so see if a different engine was in the car, in the past.

JR

[356RS]

The 019 MFI pump with the serial number 230XXXXX makes it a Oct. 72 pump date and that is correct for an early 73RS engine.