April 1968 Mark III new owner introduction

[Jberger501]

I just bought a 69 mark III. 61,000 miles (or is it 161,000?) complete California/Arizona car. Build date 4/15/68, so it’s one of the oldest. Wheel covers are dated 4/10/68. White with white leather, black top. Starting to get to know her, new discoveries every day! I think I’ll call her my “Tinker Toy!”

[Dan Szwarc]

That’s very cool. I split this off to its own thread so you can share more about your car and maybe we can help you with some repairs.

[Lee]

Welcome to the forum! You have one of the what I call “hot rod” Lincolns. 365 hp, high compression, and practically no pollution controls. Well maybe some, if it was actually delivered to California. In any case, I envy you!

[1Bad55Chevy]

Welcome to the forum! You have one of the what I call “hot rod” Lincolns. 365 hp, high compression, and practically no pollution controls. Well maybe some, if it was actually delivered to California. In any case, I envy you!

Wouldn't the head be the same as a D0VE head just a different production date (C8??-?)? I didn't think they switched to low compression stuff until like 73 or 74.

[Lee]

I was referring to the Thermactor air pump system, and I think there were a few other California-specific things, like carb calibration. I don’t think it was huge drag. In any case, back then they could report gross horsepower, even without any accessories, or water pump, and they could even run open headers, and set the timing to whatever gave the highest reading. That changed in 72.

[LithiumCobalt]

72 started the lower compression nonsense from what I’ve read. I don’t think there is much difference in the whole Mark III lineup. I’ve got a thermactor pump on my ‘71. Can’t be that much of an effect

[Jberger501]

I haven’t found an air pump so far, and the carb appears to be the regular Autolite/Motorcraft 4300. The 460 was designed to be a low emission engine with open heads to comply with the upcoming emission requirements.

[1Bad55Chevy]

I haven’t found an air pump so far, and the carb appears to be the regular Autolite/Motorcraft 4300. The 460 was designed to be a low emission engine with open heads to comply with the upcoming emission requirements.

I don't think that's correct. I know the D0VE heads are like 75cc chamber and like a D3VA is closer to 100cc. That's the difference between a 70 and a 73 cylinder head. I don't know if they made a D1VE head (1971), I know my wifes Mark has the D0VE head. I think I saw something online that a D1VE head was extremely rare or non existing I don't remember.

What heads are on your Mark? It should be like a C8xx?? I am definitely not a expert on anything but I would be curious about the differences between that and the D0VE head. I would assume they are all the same for the 460 unless you are talking about the SCJ heads which have the bigger valves and runners on them.

[Jberger501]

I don’t know what heads I have. As far as I know they’re 10.5:1 compression. I haven’t looked for casting numbers yet (I’ve only had it for 4 weeks). Where would I find the numbers? I do have the service manual, so I might search in there for casting numbers,etc. I’m still on my automotive archeology safari….

[Jberger501]

I don’t know what heads I have. As far as I know they’re 10.5:1 compression. I haven’t looked for casting numbers yet (I’ve only had it for 4 weeks). Where would I find the numbers? I do have the service manual, so I might search in there for casting numbers,etc. I’m still on my automotive archeology safari….

[Lee]

Look between the valve cover and exhaust manifold.

[Jberger501]

Thanks for the heads up. I’ll take a look today. I’m in the process of getting everything cleaned up under the hood. There’s 55 years worth of dirt under there!

[LithiumCobalt]

D0VE-C heads on my late ‘71. I think the C indicates a revision but no idea what that would have been. Master parts catalog should tell us part number applicability. I’ll check

[frasern]

The combustion chambers and valves are the same on both C8 and D0 heads, I once read that a very minor change was made to an accessory mount, or something like it, so a new casting # in 70, but they are backwards compatible. I have never heard of a D1 head, but if it exists, I would think it is a cobra jet head. Low compression began with the D2 heads.

Interesting to find such an early example, don't be shy about showing pictures!

[LithiumCobalt]

Had a look at the MPC and there are no distinctions by model for all 429/460 equipped cars, which is odd. I think the MPC always lists what the ultimate ending part number was and not necessarily what something may have come with from the factory, so this is not much help.

68/71 excluding P/C, CJ, or S/CJ is D0VZ-6049-D (CJ or SCJ has their own part number for 70/71).
For 72, D2VZ-6049-B

I’m sure there are somewhere on the internet where the engineering numbers are explained. C8VE or D0VE and differences documented. The AC compressor has a different orientation on a ‘69 compared to a 70/71. Maybe that had something to do with it.