C3 71 engine numbers correct?

[Joe71]

I'm looking at a 1971 Convertible, and not sure if numbers match engine. The problem is the engine suffix is K0701 CNR, and everywhere I look on the internet CNR is not a 71 Corvette engine suffix. But the partial VIN number is stamped on the block and matches; #194671S108157 K0701 CNR, and block cast is 3970010. Does anyone know if these numbers are correct for a 1971 350 Corvette Motor? Appreciate your help.

Thanks
Joe

[Dick W.]

Re: C3 71 engine numbers correct?

If you are looking for an original motor Corvette you better pass on this one.

The machine code and the VIN are not typical for a Corvette

[Joe71]

Re: C3 71 engine numbers correct?

Dick,

Are you saying the vin number is incorrect for this 71? and what is the machine code?

Joe

[Michael W.]

Re: C3 71 engine numbers correct?

The response to your identical question on the CF board

http://forums.corvetteforum.com/show....php?t=1417421

was correctly answered. This is not the original engine for this car or any Corvette. Sorry.

[Dick W.]

Re: C3 71 engine numbers correct?

K0701CNR is the machine code. I believe it was decoded for you on the CF.

Corvette VIN on the pad for this car should read 12S508157.

All of this is spelled out in the Technical Information and Judging Guide published by NCRS and available for order from this web site. (Is on backorder for a few more weeks)

[Chas Henderson #28127]

Re: C3 71 engine numbers correct?

Dick, are you sure? Shouldn't it read C11S108157 for a 71 sb? Thats how my engine starts out.

Chasman

[Joe L.]

Re: C3 71 engine numbers correct?

Joe-----

The CNR suffix code was used for 1970 Chevrolet passenger cars with automatic transmission and 300 hp 350 cid engines. That engine would have used the same block casting that you found on this engine. This particular engine was manufactured at the St. Catherines, ONT engine plant as indicated by the "K" prefix. No "CNR" suffix coded engines or Canada-built engines were used in Corvettes for the 1971 model year (or, any other C3 or C4 Corvette, for that matter).

I don't know what the situation is with the VIN number.

[Dick W.]

Re: C3 71 engine numbers correct?

Oops! Yer right

[Joe Albergo]

Re: C3 71 engine numbers correct?

I appreciate the great responses, and willing to help to answer my questions.

Whats real puzziling, the Vin# on windsheild post, and on the GM Label on the drivers door matches the partial vin# that is stamped along with the K0701 CNR on the block in front of the passenger head. If someone went thru the trouble of re-stamping the block with a false matching Vin#, why not remove the K0701 CNR code also, and put the correct suffix code also.

Also, if it was re-stamped could they remove only the Vin# portion before the suffix code only without an obvious signs of grinding on only half of the stamp pad?

[Tony Merendino]

Re: C3 71 engine numbers correct?

We can all speculate and guess what happened in the past. Bottom line this is not a Corvette motor and is not correct for any Corvette. What does it mean? What happened? Only the guy who changed it could answer that question. Time to move on and look for another car or get that one cheaper.

[lyndon sharpton]

Re: C3 71 engine numbers correct?

can you put up a pic of the pad?

[Joe L.]

Re: C3 71 engine numbers correct?

Joe------

I really don't know what happened here as far as the VIN derivative coding. However, I, too, would like to see a photo of the engine stamp pad. Maybe that would help answer some questions.

I consider the chance that a Canada-built engine originally getting into a 1971 Corvette to be as close to "0" as you can get. Of course, something like this is not absolutely impossible.

However, among all the other problems associated with this being an original installation consider this: the "CNR" engine code was a 1970 code. Therefore, the engine would have been built to 10.25:1 compression ratio. 1971 base engines had an 8.5:1 compression ratio. I cannot see GM installing a 10.25:1 compression ratio engine in a 1971 model. It just is not the sort of thing they would do.

Second, the 1970 "CNR" engine as built and shipped from St. Catherines would have had a long leg style water pump. That would not have been compatible with a Corvette installation. So, that would had to have been changed somewhere down the line (like St. Louis). If St. Catherines had changed it, they would not have coded the engine "CNR".

As I say, a picture of the engine block stamp pad may answer questions. Otherwise, I don't know what to tell you. I just don't think that this is an original installation. I can virtually guarantee you that it would never be accepted in an NCRS or NCCB judging environment as original unless you could produce some POWERFUL and INDISPUTABLE proof/documentation that it's original.

[Dick W.]

Re: C3 71 engine numbers correct?

As Joe says, there are no plausable explanations for this being a Corvette engine. It will get at least a 50 point deduction, depending on if the date code on the block is correct, on the judgin field. I believe that Bloomington would "box" the car, which means that a Silver would be the top award the car could obtain.

If you are looking for a numbers matching car, move on. This one ain't gonna ever be one without restamping the engine.

[Joe Albergo]

[Michael W.]

Even worse-

Many (all?) 0010 McKinnon blocks do not have the date code in the expected location near the rear flange, passenger side.