What trucks got heat stoves in 1969?
 

At what point in 1969, did heat stoves appear on our trucks? Below is a 69 Blazer that is purported to be low miles and looks relatively honest.

1) The paint color gives away it's 1969 status
2) The air cleaner assembly is the earlier version without a provision for the heat stove.
3) Blazer production began later in the 1969 MY
4) This truck has A.I.R. manifolds and no pump. Not surprising, but just to point out that it's not untouched.

Re: What trucks got heat stoves in 1969?
 

Here is a period pic of a 307 4WD. The valve cover decal would tend to give it away as a 1969. It obviously has a heat stove.

Re: What trucks got heat stoves in 1969?
 

Here are two more pics of 69s with non heat stove air cleaner assemblies. One is FirstOwner69's (Thanks Jim) Fremont C20 (Dec 68) which has a complete known history. (Also of note is that it came with the white AC decal on the breather and not the black one.). And the other is a 69 K10--that "appears" relatively honest. Jim's was non-emissions from the factory, the white truck appears to have had a smog pump-ectomy.

Re: What trucks got heat stoves in 1969?
 

Not that this is a good measuring stick...but none of the 69 brochures show it.

Re: What trucks got heat stoves in 1969?
 

This thread is obviously self serving, in that we want to do what is most likely correct for our build...an Oct/Nov of 68 St. Louis 4WD truck. Without knowing for sure, I'd bet the Blazer above was built in St. Louis based on the firewall handwriting. It would make sense to me that with the 69 engine changes, early MY trucks might not have had them and later MY trucks might have. My instinct is that our truck would not have had a heat stove and would have had a white decal on the breather. And with regard to a curved dipstick on a 69 4X4....I can't find an example at this point. What am I missing? Thanks in advance for any insight.

Re: What trucks got heat stoves in 1969?
 

Here is a pic of my original 69 K20 Fremont truck engine, no heat stove. I believe this is an earlier year '69 because it has marker reflectors, not lights, at each corner. Can you tell the build date by the VIN?

Re: What trucks got heat stoves in 1969?
 

Thanks for the pic. There were no blue door decals in 69 with the “born on” date. That didn’t come along until 70. If you don’t have a build sheet (often found in the seat springs) or the protecto plate...you can only infer the build date based on the VIN. You can see how we collectively tried to do that with my Blazer with much board help from Keith Seymore and others: http://67-72chevytrucks.com/vboard/s...d.php?t=650057

Re: What trucks got heat stoves in 1969?
 

I do have the build sheet at home, found it between the cardboard tank cover and tank, so its in great shape. I'll check it tonight.

Re: What trucks got heat stoves in 1969?
 

In the 1969 GM Service Manual it states that "most" had heated air intake. My understanding is that it depended on the GVWR, at least in Calif. I bought my '69 2500 from the estate of the original owner in near perfect original low-mileage condition and it has no smog equipment except for the PCV of course. It has the 7500 weight rating.
The truck I had before this was a '69 1500 and it had all of the smog stuff but I don't remember a heat stove. I had to find all of the required smog equipment to get it to pass smog but honestly, I don't remember fussing with a heat stove and yet it did pass eventually. (Big help huh.)

Re: What trucks got heat stoves in 1969?
 

Thanks for the Service Manual info. That at least supports the idea that it's a mixed bag.

FirstOwner69 expressed a similar sentiment about his 3/4 ton. Regs may have played a role in the heavier GVWR trucks. What I'd like to dig further into is: If "most" got them, what was the driving criteria? Let's say only 1/2 tons got em. Well, the pictures above make me suspicious that all 1/2 tons did. And if all didn't, then was it a timing issue...like most after Jan 69 got em. I would expect that the breather assembly was on them from the engine plant...so the point of decision is there. Not at the assembly plant where they are just dropping them in and hooking them up. Again, wiser and more knowledgeable voices please chime in.

Re: What trucks got heat stoves in 1969?
 

11/14/68 is the build date

Re: What trucks got heat stoves in 1969?
 

How about this...check out the Protecto-Plate from our 69 Fremont K10 donor! edit: I flipped the pic to make it easier to read. Also between your VIN and this one we could infer how many days our donor truck sat on the lot. Since yours was built and ours was sold on the same day.

Re: What trucks got heat stoves in 1969?
 

In '68 anyway, I think automatics where more likely to get heat risers. Standards were more likely to get AIR. I think 3/4 and 1 tons tended not to have as much for smog controls.

I am not sure how 4X4 affected these rules.

California trucks probably had different rules.

Re: What trucks got heat stoves in 1969?
 

Thanks Tom. I guess I was unaware that any 68s came with heat stoves. What about yours? I don't think that smog pump and heat stoves go hand in hand.

By the book all 69 4x4s were manual transmissions. I assume the black and white photo above is a 69 because of the valve cover decal. You can tell it's a 4x4 by the upper radiator pipe. It does not have AIR and does have a heat stove.

I think it is likely that 3/4T and 1T ton had different requirements. FirstOwner69's 3/4T came with no emissions equipment and was build in CA and sold in CA.

My feeling right now is that for our truck (which was built in Oct/Nov 68), I'm likely not to put heat stove components on. If it were later in the MY, say late winter or spring...I'd be more inclined to. I was just hoping that this thread could help me procure some additional information to either reinforce or change my position.

Re: What trucks got heat stoves in 1969?
 

My 68 is a factory 4 speed. It has a smog pump.

Re: What trucks got heat stoves in 1969?
 

Thanks Tom. The smog pump is not what I'm worried about. I'm trying to figure out what 1969 trucks had heat stoves...which would include the exhaust manifold shielding, tube and breather assembly highlighted in this picture.

Re: What trucks got heat stoves in 1969?
 

Further info from factory service manual;

It lists 3 types of "air-cleaners"; 1) "oil wetted paper element", 2) two element air cleaner, and 3) oil bath.

" The two element air cleaner utilizes an oil sump in the air cleaner bottom and a fibre element"

"On most applications of the two element air cleaner it is used in conjunction with an exhaust manifold heat stove". -goes on to describe the system-

From this I would assume that oil bath and oil wetted paper air cleaners did not use heated air. My Freemont Calif '69 1/2 ton sold in Calif. had the air pump but no heat stove.

Re: What trucks got heat stoves in 1969?
 

Thanks for that...and I would agree with your assessment. For additional reference, here is a pic of a 1969 K10 with an oil bath air cleaner.

Re: What trucks got heat stoves in 1969?
 

This also gives us another known example of a 69 1/2 ton without a heat stove...compared to only one example of 69 with a heat stove. A small sample size to say the least, but it does run contrary to the "on most applications.." statement. It also makes me feel a little better about the decision to go without. Thanks again for posting.

Re: What trucks got heat stoves in 1969?
 

FWIW I have a 69 made in April 69 that has the same air cleaner as the blazer in the pics. No heat stove or provisions for it.

Re: What trucks got heat stoves in 1969?
 

Hey, it's worth a lot to me. Thanks for posting. Was your truck a 1/2T? What was the assembly plant? Pics maybe?

Re: What trucks got heat stoves in 1969?
 

Yes 1/2t suburban made in Detroit. I think all the suburbans were made there. I will get you a pic tomorrow.

Re: What trucks got heat stoves in 1969?
 

Thanks.

Re: What trucks got heat stoves in 1969?
 

Another pic for reference. Late 69 Blazer...August of 69 in fact from St. Louis. 307 with a non heat stove air cleaner assembly.

Re: What trucks got heat stoves in 1969?
 

This image may have previously been posted on the board, but I found it on the greater web. It is purported to be taken at the Flint Assembly plant in 1970. I post it mainly because my assumption (as stated earlier in this thread) that the air cleaner assemblies were on the engines when they arrived at the assembly plant was clearly wrong. It's also a totally awesome pic and post worthy for many other reasons.

Re: What trucks got heat stoves in 1969?
 

Another log on the pile...1969 1ton low mileage original. No HS.

Re: What trucks got heat stoves in 1969?
 

I remember reading some literature that said automatic trans equipped trucks received thermAC vacuum module on the air cleaner and the preheater from the exhaust manifold but four speed trucks did not require that emissions equipment.

Re: What trucks got heat stoves in 1969?
 

That may very well be the key with the 1/2 tons. I have no evidence to the contrary. The Burgundy K5 that leads this thread appears to be a manual truck and does not have a HS. 3/4T and 1T may not follow suit because of differing emissions standards. Here's a 69 Longhorn(green) auto without...and a 69 1/2T auto (apparently) with.

Re: What trucks got heat stoves in 1969?
 

I believe this is probably the case. As you mentioned in post 3, my '69 3/4 ton never had a heat stove. As I recall, the heavier duty trucks were excluded from much of the rapidly changing laws... at minimum lagging behind. And, my truck was built in Fremont and sold new in southern California.

Jim

Re: What trucks got heat stoves in 1969?
 

Here's one. 69 307 AUTO with heat stove. No SPID or VIN info on this truck so the date and plant of manufacture are unknown...but it's a CST with a rear view mirror, and headliner, but no cargo light. So it's late enough in the model year to have some, but not all of the CST option add-ons.

This truck fits our hypothesis.

Re: What trucks got heat stoves in 1969?
 

'69 CST/10... Custom Camper likely a Oct/Nov truck. Born in Fremont with a VIN ending in 27955. It is a purported one owner 53K mile truck and looks the part. It's an automatic and has a heat stove. So the automatic holds true.

Edit: I previously posted this incorrectly as a C20. I just saw the Custom Camper nameplate and assumed. Still no 3/4T with heat stoves. But so far all '69s that I've found with heat stoves have been automatics.

Re: What trucks got heat stoves in 1969?
 

The engines were built at the engine plant without carbs or any engine "Dress". They then went to another assembly line where they received the proper carb, and brackets for the different options. Plus starters, motor mounts etc.

Re: What trucks got heat stoves in 1969?
 

I think the pic in post #25 definitely bears that out.

Re: What trucks got heat stoves in 1969?
 

Early 69 k20. No stove. I’ll get pics Sunday and revisit thread. Fremont truck sold in Oregon. I’m second owner.

Re: What trucks got heat stoves in 1969?
 

69 1/2T automatic

Re: What trucks got heat stoves in 1969?
 

My early '70 3/4T with a 402 BBC and 400 THM has the vacuum valve in the snorkel, but no pipe or sheet metal around the DS exhaust manifold. It has an exhaust manifold with no AIR fitting attach points on the driver's side, and an exhaust manifold on the PS with plugged AIR fitting attach points. I met my wife in 1980, and the truck hasn't changed in that time, to my knowledge (except that my FiL got it painted and the shop didn't paint the part below the lower molding white like it was from the factory. I busted his chops over that, and he busted mine back. :lol: Not my truck! I realize that mine is a '70, but I guess that the factories did different stuff at different times. FWIW, I worked on spacecraft for many years, and while they conformed to the electronic communications requirements, mechanically they could be quite different, within the design parameters. One spacecraft program I worked on was spin-stabilized, and every one of them got balance weights in different places.

Re: What trucks got heat stoves in 1969?
 

Steven...after collecting pics of original examples for a while, I think it's safe to say that only 1/2T automatics got heat stoves in 69. No 3/4Ts (likely because they'd lag on emissions standards). No manuals (which means no 4WD trucks). Blazers were later in the model year, so all I can say is I haven't seen a 69 Blazer Auto (all were 4WD in 69) with a heat stove.

By 70, they all should have the heat stove. While it's possible you could have mismatched manifolds from the factory, I think it more likely an exhaust manifold came off at some point and the heat stove tin (as is often the case), did not get replaced.

Re: What trucks got heat stoves in 1969?
 

The engine and trans were rebuilt about 25 years ago, so those parts could have been left off. It's a CST but the windshield doesn't have the stainless trim in it. If the windshield had been replaced, knowing my FiL, he would have told them to leave it off. That was possibly done, since the old gasket had no provision for the trim. I replaced the gasket when I pulled the windshield to clean up and paint the roof.

Re: What trucks got heat stoves in 1969?
 

Not to throw a wrench in the works, but i have a 69 swb fleet that had an automatic and NO heat stove. It was a Fremont build not for CA. Unfortunately it's all apart now, but it was a low optioned truck, no AC.... only had an automatic, AM radio, and HD rear coils.

Re: What trucks got heat stoves in 1969?
 

Would be interested in pre-disassembly pics and build date (or at least VIN to get a relative build date). My knee jerk reaction (if original 1/2T auto w/o heat stove) would be early build date. But who knows...