77Driver

If you had 2 1970 base model convertibles sitting side by side in B condition what percentage would a NOM devalue the car?

jr9170

Both being equal I would say at least 5 thousand

KenSny

I would have to think about what kind of motor is in there now. And if that would mean anything to me.
I'm not into NCRS correct cars, but I would wantt to know what else has been modified and it's value.

20mercury

Agree with above, depends on what engine, on a base 350 about 5K delta. On a big block or LT-1, 10++K. Also if replacement engine is "ordinary" or something hp++. So for example, my crystal ball/guesstimate; base 70 convertible with NOM, +/-18, with original engine/4sp 22-25. Lots of variables, winter vrs summer, frame rust condition, options, color, 4sp or auto, location, and Luck, Ha!

derekderek

NOM of a base motor is much less important than the same car with the L71 or LT1 engine missing. I don't think a 70 vert that had a 350-300 and now has a vortec or AFR head roller 383 is worth much if any less than orig. Unless we are talking REALLY orig. Same with LS5 car with a gen 6 502.

Stev-o

Agreed. Not every guy necessarily wants the original motor in there, my buddy prefers his cars [has 6 corvettes] to have an updated, more reliable motor.

thatcorvetteguy

More reliable motor??? I don't think the small and big blocks are unreliable?

Stev-o

By "more reliable" I mean a crate motor vs an original motor with 100,000 miles or rebuilt by an unknown shadetree mechanic

vettebuyer6369

I disagree. I think the difference between an NOM over a base motor is less than the higher-collectability motors of course, but the one engine in the world, original motor in the car is always worth more on the market, than some speed shop replacement, $5k minimum.

While its true that not "every guy wants it," but that has nothing to do with market value. Some "guys want" oddball colors and goofy wings but it doesn't make the car worth more, it makes the incorrect cars a much, much better value for the guy who doesn't care about originality.

stingr69

Matching numbers means more for a rare 100 point car than it does for a more common base engine vette. Cant possibly be the same answer regardless of HP level. If I liked 2 base engine cars but only one had matching number engine it would not make much difference. I would not pay a $5,000 premium. Thats just crazy.

77Driver

It sounds like the answer is about $5K on an excellent but not concourse level restoration. Hagerty estimates the value at $57K for an excellent car and $32.5 for a good car. The motor was a warranty replacement however the documentation from Chevrolet was lost.

BarretHC1

I'd say personally 8k less with NOM. I value my 1969 350/350 at 28k. I think if it had NOM, i'd be more around 20k. IDK, it's just my opinion. On the other hand, my '56 T Bird, wouldn't really bother me that much if it had a NOM. I think it was because GM made such a big stupid deal over matching numbers on everything and it had just stuck with me as being important. I would definitely buy other vehicles with other engines, or LS swaps etc....

BBCorv70

It has nothing to do with GM, numbers matching is a collector phenomenon. From what I've read, it was originally a way to determine whether the car was well cared for, an original engine still present was evidence the car was not abused. From a collectors POV, the block is unique as is the frame and body, serialized, in theory only one exists.

A local shop once said, rather cynically, the difference in value is the cost to obtain a restamped block and install. If numbers are important, best to be sure there's documentation to back it up, maybe hire an expert to look for evidence of a restamp.

OldCarBum

I paid a couple thousand more for mine with everything numbers matching.
It was important to me because a numbers matching untouched car was what I was looking for so I did not have to worry about having to fix what others had done to the car before I owned it.
If it was a really nice resto/mod or the original engine had been replaced with another big block and the work was professionally done, I might have paid more.
I think the numbers matching concept, is more important to the buyer and he will pay more for his own personal reasons.