help decipher my 69 Nova

[racerkvn]

Let me start by saying, I didn't buy this car under the impression or assumption of it being a numbers matching car. I bought the car from a friend of mine who is NOT a car guy and never has been. His Dad on the other hand was a car guy and he is "technically" who I bought the car from after he passed away. He unfortunately passed away about 4 years ago and my buddy inherited the car after his passing but he wasn't going to do anything with the car as long as his Mother was living (it was THEIR car that they enjoyed until he became ill and ultimately terminal). Unfortunately, his mother passed away back in January this year and my buddy started the process of selling off their estate. My buddy first told me about the car 4 years ago and I told him when the time comes and he had reached the point of selling the car to let me know. Fast forward to March, my buddy told me he's gonna sell the car and he promised me first offer on it. I really wasn't in the market to buy a car BUT, me being a car guy I'm always open to look. My buddy told me up front, he knows the car had been restored but doesn't know if the car is original or not and he has not found any information regarding the car, no receipts, no anything since his mother passed away and he didn't even "look for anything" in the time frame between his dad passing away and his mother passing away. During those 4 years, the car stayed in their garage and never moved. When I went to look at the car it was dusty from 4 years of garage dust and popped the hood it appeared to me to be a L34 big block, cast iron intake, Quadrajet carb AND get this, A/C. I could tell his dad used to keep it clean but I could tell his dad had also gotten to the point that he couldn't crawl under it and in and around it and keep it as clean as he once did, it had road grime everywhere but definitely NOT bad. Overall I could tell it was a nice car with absolutely ZERO rust on any of the body or floor pans and that big block had me sold anyway. Took alittle doing to get it to run and it immediately developed a pretty substantial oil leak(s) from numerous spots. He priced me the car, I bought it and drove it home the next week. Once I got it home I started cleaning it up and fixing oil leaks. This went on for WEEKS (actually, it has never ended LOL as I'm still "cleaning" and tinkering with it). Now for the deciphering part...

When fixing one of the oil leaks I could read the block casting number to be 3955272. I pulled the valve covers to fix those from leaking and the head casting number is 3931063. Took some towels and wiped all of the grime off between the alternator and head and the block stampings read T1106JM 19W353779 (the "779" appears to be a correction restamp and one of the sevens was stamped 90 degrees from orientation which constituted the restamp). The VIN on the dash is 114279W353779. The Fisher Body Cowl Tag; ST 69 11427 WRN177426 BDY
TR 732 51 B PNT
11B 0 B 3
The 12 bolt rear end is stamped BL 11 14 G1. It is an open differential non posi.

So by the numbers, I believe the motor was first week of November, the body was second week of November and the rear axle was second week of November. The car is Dusk Blue (paint code 51). The interior is the custom interior package with the bench seat (732). And it has the black vinyl top (B). So the car appears to be matching numbers. Well mostly. The transmission is a Turbo 350 and why it's not a Turbo 400 is anybody's guess as I have no idea why it would've been changed on such a high detail nut and bolt ground up restoration. When I say high detail restoration, I mean, there is ZERO paint overspray on anything that it shouldn't be such as wires, hoses, lines, washers, nuts, bolts, sheetmetal clip nuts, under the dash, firewall, etc, etc. Same question about that transmission can also be said about the factory A/C. I had no idea when I bought the car that finding a factory big block Nova with factory A/C was like finding a real life Unicorn. Evidently, the general consensus is, there was none. BUT the plot thickens because I stumbled upon ChevyNova.ORG 1969 Nova Power Teams Bulletin posted June 1st 1968, A/C was an early option on the L34 big block. It was NOT an option on the L78 big block. THEN, a revision to the 1969 Nova Power Teams Bulletin was posted on April 1st 1969 that omitted A/C as an option for both of the big block engines. Since my car by the numbers appears to be early production (November 1968 L34 big block car) it begs the question, is the A/C legit or not? I pulled the rear seat out hoping the find the build sheet, no luck. The rear seat has been changed/recovered at some point.

I thought the folks on this forum may be able to help me figure out what I have. I'm hoping somebody knows something about the history of this car. I did send off for the MuscleCarDOX, we'll see what that provides. It would be nice if my buddy contacts me and says he found a safe deposit box with the build sheet in it!

[GMC_Typhoon]

As far as I know you can only not get air conditioning on the solid lifter motors. So I don't think it would be any problem to get air on a low horse big block.

[racerkvn]

Originally Posted by GMC_Typhoon

As far as I know you can only not get air conditioning on the solid lifter motors. So I don't think it would be any problem to get air on a low horse big block.

That was my understanding as well.

[WILMASBOYL78]

Sounds like you have an interesting car there...the subject of a big block Nova equipped with factory a/c has been discussed here before. It is generally accepted that none were produced, sort of like the L89 option in a Nova.

Of course, many folks claim that GM did some one-off things for certain people, adding to the urban lore of these cars.

Without documentation it is hard to prove...but an expert inspection of the a/c install and other items might shed some light. If the car was converted, there will likely be evidence. The swapped trans also adds a little mystery to this car. The TH400 was standard behind the big blocks, and they were pretty much indestructible, so why bother to down grade to a TH350 ??

The cowl tag date of the car and the axle assembly date are very close, almost too close. The BL code doesn't make sense for a big block car...most L34 cars had a 3.31 or 3.55 axle.

Lastly, the engine stamp info makes no sense...a JM stamp on a 1969 '272' block, equates to a 396/375hp with aluminum heads with a TH400 installed in a Camaro. The correct code for an L34 Nova with TH400 is JI...so this adds another layer of doubt to the process.

So, my guess regarding this car is this: it was likely a factory small block car with a/c...that would help explain the TH350 and 3.07 axle. The big block was added at some point, perhaps during the restoration, and things were trimmed out to make it look like a factory 396 car. As for the deck stamp...without photos it is hard to confirm if it is authentic. If it is a real L89 block with low horse parts on top, it may be worth a lot to the right person.

Hope this helps...wilma

[racerkvn]

Originally Posted by WILMASBOYL78

Sounds like you have an interesting car there...the subject of a big block Nova equipped with factory a/c has been discussed here before. It is generally accepted that none were produced, sort of like the L89 option in a Nova.

Of course, many folks claim that GM did some one-off things for certain people, adding to the urban lore of these cars.

Without documentation it is hard to prove...but an expert inspection of the a/c install and other items might shed some light. If the car was converted, there will likely be evidence. The swapped trans also adds a little mystery to this car. The TH400 was standard behind the big blocks, and they were pretty much indestructible, so why bother to down grade to a TH350 ??

The cowl tag date of the car and the axle assembly date are very close, almost too close. The BL code doesn't make sense for a big block car...most L34 cars had a 3.31 or 3.55 axle.

Lastly, the engine stamp info makes no sense...a JM stamp on a 1969 '272' block, equates to a 396/375hp with aluminum heads with a TH400 installed in a Camaro. The correct code for an L34 Nova with TH400 is JI...so this adds another layer of doubt to the process.

So, my guess regarding this car is this: it was likely a factory small block car with a/c...that would help explain the TH350 and 3.07 axle. The big block was added at some point, perhaps during the restoration, and things were trimmed out to make it look like a factory 396 car. As for the deck stamp...without photos it is hard to confirm if it is authentic. If it is a real L89 block with low horse parts on top, it may be worth a lot to the right person.

Hope this helps...wilma

I know without documentation it can be argued back and forth all day. I was sure hopeful the build sheet was in the car but it at least wasn't under or behind the rear seat as I yanked that out to look for it. I didn't go any further looking though.

From all of my research (which isn't much in the grand scheme of you guys) everything you've said is right in line with everything I've read about too. I was fully expecting "JI" on the block and at first glance I thought it was JI but after cleaning the area some more and playing with different angles of lighting, it is definitely "T1106JM 19W353779". I will see if I can get a picture of it to turn out maybe tonight. I do have a picture that I took but I've doctored the picture so much to make the numbers standout that it really doesn't show an accurate depiction of what the stampings actually look like in person.

The Turbo 350 had me scratching my head too for the same thoughts as you, why would someone "downgrade" from a Turbo 400. You know, you bring up an interesting thought. I have been fixated on the big block because everything (minus the transmission and the questionable A/C) adds up to a factory big block car in terms of the big fuel line, dual exhaust mounts in the rear subframe, 5 leaf leaf springs, 12 bolt, etc. I didn't think about it going the other way of possibly being a small block A/C car that someone stuffed a big block into. That might actually be what is going on here. I say that because, man there is absolutely no indications of the sheet metal on the dash or the firewall being "massaged" and or messed with in regards to someone adding factory air components to a car that didn't have A/C to begin with. I would think if the body didn't originally have A/C there would be some signs of modifying something even as minute as possibly elongating screw holes or an opening somewhere but there is nothing that remotely seems tampered with or and/or cut.

I would love for someone who "knows" these cars to look it over because just the same, without documentation, it's still 50/50.

[WILMASBOYL78]

Originally Posted by racerkvn

I know without documentation it can be argued back and forth all day. I was sure hopeful the build sheet was in the car but it at least wasn't under or behind the rear seat as I yanked that out to look for it. I didn't go any further looking though.

From all of my research (which isn't much in the grand scheme of you guys) everything you've said is right in line with everything I've read about too. I was fully expecting "JI" on the block and at first glance I thought it was JI but after cleaning the area some more and playing with different angles of lighting, it is definitely "T1106JM 19W353779". I will see if I can get a picture of it to turn out maybe tonight. I do have a picture that I took but I've doctored the picture so much to make the numbers standout that it really doesn't show an accurate depiction of what the stampings actually look like in person.

The Turbo 350 had me scratching my head too for the same thoughts as you, why would someone "downgrade" from a Turbo 400. You know, you bring up an interesting thought. I have been fixated on the big block because everything (minus the transmission and the questionable A/C) adds up to a factory big block car in terms of the big fuel line, dual exhaust mounts in the rear subframe, 5 leaf leaf springs, 12 bolt, etc. I didn't think about it going the other way of possibly being a small block A/C car that someone stuffed a big block into. That might actually be what is going on here. I say that because, man there is absolutely no indications of the sheet metal on the dash or the firewall being "massaged" and or messed with in regards to someone adding factory air components to a car that didn't have A/C to begin with. I would think if the body didn't originally have A/C there would be some signs of modifying something even as minute as possibly elongating screw holes or an opening somewhere but there is nothing that remotely seems tampered with or and/or cut.

I would love for someone who "knows" these cars to look it over because just the same, without documentation, it's still 50/50.

Here are some additional things to consider: A small block car could have a 12 bolt rear, dual exhaust and multi-leaf rear springs. As for the fuel line...the 350/300hp small block used a dual fuel line setup, one being the return. Not sure if the lower hp versions had this, they may have been single lines. Regardless...the 3/8" fuel line could have been added easily during the resto.

Did you state the car is badged as an SS..?? Another item to look at is the transmission cross member...pretty sure the TH400 version is unique. I'll bet it has a TH350 crossmember...

Based on your assessment that the car has not been modified to accept the a/c system...it is really telling me this was a converted car. Does the engine block have the large plug by the oil filter?? This was unique to the high horse big blocks...you may have a 4 bolt block with low horse parts bolted on....or whoever stamped the motor didn't know what they were doing.

Why not post some photos of the car and re-take a good image of the deck stamp...the gang here can help sort this out for you. There may be an SYC member near you who could take a look.

-wilma

[olredalert]

Originally Posted by WILMASBOYL78

Sounds like you have an interesting car there...the subject of a big block Nova equipped with factory a/c has been discussed here before. It is generally accepted that none were produced, sort of like the L89 option in a Nova.

Of course, many folks claim that GM did some one-off things for certain people, adding to the urban lore of these cars.

Without documentation it is hard to prove...but an expert inspection of the a/c install and other items might shed some light. If the car was converted, there will likely be evidence. The swapped trans also adds a little mystery to this car. The TH400 was standard behind the big blocks, and they were pretty much indestructible, so why bother to down grade to a TH350 ??

The cowl tag date of the car and the axle assembly date are very close, almost too close. The BL code doesn't make sense for a big block car...most L34 cars had a 3.31 or 3.55 axle.

Lastly, the engine stamp info makes no sense...a JM stamp on a 1969 '272' block, equates to a 396/375hp with aluminum heads with a TH400 installed in a Camaro. The correct code for an L34 Nova with TH400 is JI...so this adds another layer of doubt to the process.

So, my guess regarding this car is this: it was likely a factory small block car with a/c...that would help explain the TH350 and 3.07 axle. The big block was added at some point, perhaps during the restoration, and things were trimmed out to make it look like a factory 396 car. As for the deck stamp...without photos it is hard to confirm if it is authentic. If it is a real L89 block with low horse parts on top, it may be worth a lot to the right person.

Hope this helps...wilma

--- It had an open rear end, so no one was thinking drag racing, or anything close. Don't exactly know what the ordering customer was going for....Bill S