most T's will not bring $30,000*, but the relevant question here is whether a stock T with CIS is worth more (or less!) than a properly done conversion to carbs

and that assumes that the only thing you care about is the potential sales price of the car, and you are indifferent to driving enjoyment

you could always sell the car with carbs a box containing the CIS components

if you plan to be buried in your car it does not matter


* I will try to remember to look up and post some factual information on pricing when I get home tonite

Regarding the thought of returning the engine to CIS: The CIS will not like the E cams. CIS requires cams with very little overlap due to the metering characteristics of the air flow metering plate. There are pressure waves traveling back up in the intake with cams that have significant overlap, such as the E, that mess with the proper operation of the metering plate. The E cams are better suited to carbs or mechanical injection, or for that matter, EFI.

Bruce Anderson's survey data show that for a 911T to sell for north of 30k it has to be a car in excellent condition.

What is the condition of the car you are looking at? Where would it place in a Concours?

I just purchased a very original, 73.5 911T targa that had been sitting in a garage for 20 yrs with the motor & transmission out. I will rebuild the motor and might decide to go with webers just because I like them, but I will also keep the CIS parts. It was originally Sepia Brown and later painted red. It will get repainted, but maybe not Sepia. If I change the color, I will use a Porsche color. When it comes to originality and value, I think as long as the changes to originality are upgrades or period options/equipments, the value will be similar to a 100% original (not survivor) car.

Cis
 

My thoughts on this particular issue, If the car was an "S" or an "E" then I'd be more concerned with the originality issue. Since the engine has already been altered, then the Weber vs CIS issue is moot ( IMO ). Yes, I know there are no "S" & "E" CIS 73.5's.

I'd buy a Redbook to confirm the engine / trans #'s and to have on hand for future reference.

Additionally, have you researched the person selling this car? There's a few "shady" dudes operating in the SFBay area..........I know, they are in every City / Town in the Country but I personally got burned by fast classics / Born2Bfast / Sears Point Classics in the SFBay area. I wish I had done my research back then.

Steve

73 911 T MFI Coupe, Aubergine

my take is that unless - EVERYTHING is original / OEM, then dont bother. It also wouldnt make it a deal breaker as its already built into the price of the car. Doubt you are paying 30k for that car. More like 20k max. Its a T which makes it hard to recoup your money anyway, putting CIS back on the car ($$$) when there are other things like the P/C and cams that are not original doesnt make sense. There are probably other bits you dont even realize that were removed as part of the PO's "upgrade".. so you dont want to spend a bunch of money only to hear someone say.. oo geez thats not an original car.. its missing x and y and z... What I would do is probably over a period of years try to collect all the missing bits so that when you do try to sell you have them. If you want a 30k T then plan on spending alot more than 30k.

The 73.5 2.4L engine had the injectors in the cylinder head rather than in the intake runners.

When the engine was converted over to carbs, did they change the heads too with all the other work?

I agree, CIS will not work well with the engine modifications that have been done.