CADbrian

I'm looking at a 1967 coupe that has been restored and currently has air conditioning (and of course the air conditioning looks original - vents, *****, etc.). However, the engine stamp on this restored 1967 ends in HT. Both places (Wilcox and NastyZ28) say "HT = 327 / L79 350 1x4BC, Hi-Lift Cam & 4-Speed" with neither of them mentioning the possibility of air conditioning.

So how did this car get air conditioning?

Did GM ever make mistakes and install air conditioning on an HT engine stamp car?

How likely is it for an HT engine to have left the factory with air conditioning?

Is it more likely that air conditioning was added to the car after it left the factory, i.e. perhaps during its restoration???

Is it just as simple as what Wilcox and NastyZ28 show - HT cars absolutely DO NOT have air conditioning?

What are your thoughts?

Thanks.

emdoller

If it has AC on the L79 I believe it gets the HP designation.

Ed

14decoys

Does the car have PS ?? I believe HP is with PS and AC. My L79 with factory AC is HT

Powershift

You are correct. For 1967 model

HT = 327/350 HP + nothing else OR PS only OR AC only

HP = 327/350 HP + PS and AC.

Larry

EDIT: My own 1967 car VIN 194677S114845 has a 327/350 HP engine and factory air conditioning. The engine suffix is HT. Car is 27, 000 mile fairly original car with the tank sticker. AC is shown on the tank sticker as is the 350 HP engine.

68hemi

The 350 h.p. engine WAS available with A/C. What I think Wilcox and Nasty are saying is not with that engine code and that the engine should have a different 2 character suffix for the way your car is equpped. I am not sure what it is but others will know. I would be more inclined to think you have a re-stamped engine by someone that did not know what was correct to use.

14decoys

The Wilcox site shows HP is with AC AND PS....nowhere does it say anything about a car with AC and no PS, which is what mine is. It is original block and is an HT.

CADbrian

From Wilcox:

HT327L79 350 1x4BC, Hi-Lift Cam & 4-Speed

HD327L79 350 1x4BC, Hi-Lift Cam, K19 & 4-Speed

HP327L79 350 1x4BC, Hi-Lift Cam, A/C, P/S & 4-Speed

KH327L79 350 1x4BC, Hi-Lift Cam, K19, A/C, P/S & 4-Speed

CADbrian

Your statement matches the information found on Wilcox.

CADbrian

We are talking about how a car with an HT engine stamp could possibly have both PS and AC. Yes, HP stamped cars have both AC and PS.

CADbrian

The car does have power steering. Unfortunately, I am not able to verify with any documentation what options were original to the car when it was built.

Wilcox infers that an HT car has neither PS or AC, but yet this car seems to have both. Something's not adding up...

CADbrian

I am very aware of that.

I understand and agree with this.

This is certainly a possibility as the car currently (50+ years after it was built) has both PS and AC with an HT engine stamp, and that doesn't make sense. This seems to suggest one of the following possibilities:

1. a mistake was made at GM when the car was built (I don't know how likely this is but it seems to be very unlikely)
2. either PS or AC was added to the car after it was built
3. this car has a restamped engine block

Are there any other possible explanations?

CADbrian

Oh the joys one experiences without good documentation

woodsdesign

I personally worked on a car that the owner added factory AC. He got all the original parts off a wreck and switched them to his car. I have added PS to one of my cars.
So, the point is if one person i know did it then I am sure many more have. I think this is most likely what happened.
Also, it amazes me how fast people go to the re-stamp scenario. JMO

provette67

This has been discussed here before.

https://www.corvetteforum.com/forums...gine-code.html

CADbrian

Pancho, perhaps you, or someone on this forum could spell it out for me so that even I can understand it...

This 1967 coupe that I'm looking at currently has PS & AC with an engine stamp of HT. Is the consensus of those with knowledge that one of these 2 options (either the AC or the PS) was added to the car after it was built?

Thanks for dumbing it down for me.

Powershift

I wold look very close at the power steering. My educated guess is that it was added. There are clues. Check part numbers and any dates codes.

A few folks I know have added factory AC, but often if they did the car was damaged and rebuilt, with the AC then added at that time.

Look for date code on the various PS and AC components as well as for correct pullies on the engine and various components. Car may also have a tank sticker, which can be viewed by pulling back the gas filler boot if sticker is still attached to the tank. You need to be part investigator and a skeptic when looking at these older cars. Expect this. Engine pad itself could be a incorrect re-stamp, so check for this.

It may be possible for a car to have PS and AC and a HT suffix engine, but I have not seen one that I can clearly remember. Years ago I remember something like this, but the St Louis factory guys actually re-stamped a "P" over the "T" on the engine suffix (and added or changed things when doing so) due to a shortage of the proper engine that day. But this memory is foggy at best.

If you love the car, but doubt the authenticity then hire Pancho or equivalent to inspect it for you. Then you will know for sure.

Larry

65 fi

From another thread asking about the 66 codes:

JohnZ
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Member Since: Oct 2000
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There is no Engineering reason for a '66 or '67 with either A/C or power steering to have a unique engine assembly, as neither option has any affect on the basic engine as-shipped. It mattered in '64-'65 due to the relocation of the alternator to the LH side with A/C, but not in '66-'67 when ALL alternators were LH-mounted.

We may never know why they assigned the "HP" suffix, but known-original cars with A/C and/or power steering have been observed with "HT" suffixes. This debate has gone on for years.

93RubyRedCoupe

If it's that Lynndale Coupe, that's a pretty car. I have some thoughts on the stamping too. ARA

CADbrian

Yes, it was the Lyndale Copue. I lost a lot of interest (whether right or wrong) the moment the engine stamp became difficult to figure out. Even my NCRS guy said, "I don't understand the engine stamp... This will need more digging." It's easy to buy a car, but difficult to sell when something like the engine stamp doesn't make sense (unless the buyer is unaware/uneducated). I passed on it because I knew if I ever went to sell it the engine stamp "difficulties" would be difficult if not impossible to explain fully (I mean look at the thread that Pancho referred me to a few posts above - it's ambiguous at best) and frustrating for me as a seller. I just don't have enough money that I can make mistakes. I'm not saying that this was a mistake; I'm just saying that I don't have enough money that a mistaken purchase wouldn't bother me. My purchase(s) will be free from such ambiguities and backed up with an inspection from an expert. My $0.02.

SWCDuke

You can't rely on these aftermarket outfits to publish accurate information. The definitive source is the NCRS Spec Guide compiled by John Angwert, which has been revised several times over the years to reflect new and more accurate information as it appears.

Duke