Mark IV desmog/upgrade project

7169 Views 15 Replies 9 Participants Last post by Detroit Lincoln, Jul 9, 2010

Detroit Lincoln

Discussion Starter · Jul 6, 2010

Hey guys. Have been lurking for a couple months now soaking up all the knowledge I can get regarding my inherited Lincoln. This is a bit different of a thread as it's not high in the tech department, I just wanted to get some input regarding upgrading this ride a bit without changing too much of the stock personality (as it's all stock apart from interior now).

Some basics:
Emilio Pucci Special Edition
460 cid
C-6 transmission (no o/d)
8:1 compression
2.75:1 rear axle ratio

I have read what I could find regarding desmogging the motor. Most of the info was from 2006. What I gleaned from the info was this:

- New timing chain from 70ish Lincoln that isn't retarded by 8 degrees
- Look into dual exhaust unless current exhaust is already 3" in diameter
- New intake manifold and carb to replace stock Ford carb
- Recurve the distributor
- Dual snorkel air cleaner

My question is do people here agree that this is the best place to start? Any new suggestions or comments on what I have here? I'm not a mechanic, as such, but have done my share in the past (engine rebuild, 2 years of auto shop in high school, most of my own repairs, etc).

Any help would be greatly appreciated. I wanted to strike a balance of keeping the car as it was intended and using modern technology to improve its power/efficiency. Just because it's old doesn't mean it needs to run like it.

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1 - 16 of 16 Posts

rmcomprandy

· #2 · Jul 6, 2010

Detroit Lincoln said:
Hey guys. Have been lurking for a couple months now soaking up all the knowledge I can get regarding my inherited Lincoln. This is a bit different of a thread as it's not high in the tech department, I just wanted to get some input regarding upgrading this ride a bit without changing too much of the stock personality (as it's all stock apart from interior now).

Some basics:
Emilio Pucci Special Edition
460 cid
C-6 transmission (no o/d)
8:1 compression
2.75:1 rear axle ratio

I have read what I could find regarding desmogging the motor. Most of the info was from 2006. What I gleaned from the info was this:

- New timing chain from 70ish Lincoln that isn't retarded by 8 degrees
- Look into dual exhaust unless current exhaust is already 3" in diameter
- New intake manifold and carb to replace stock Ford carb
- Recurve the distributor
- Dual snorkel air cleaner

My question is do people here agree that this is the best place to start? Any new suggestions or comments on what I have here? I'm not a mechanic, as such, but have done my share in the past (engine rebuild, 2 years of auto shop in high school, most of my own repairs, etc).

Any help would be greatly appreciated. I wanted to strike a balance of keeping the car as it was intended and using modern technology to improve its power/efficiency. Just because it's old doesn't mean it needs to run like it.

YES ... those are definately the places to begin as those will be the most gain for your application.

Oh yea ... duct those dual snorkels to fresh air.

95lightiningguy

· #3 · Jul 6, 2010

A lower rear gear ratio would help get that tank movin better. Oh yeah, thats a nice Lincoln.

mxb

· #4 · Jul 6, 2010

dont waste money on an intake until you get inside the engine

rmcomprandy

· #5 · Jul 6, 2010

mxb said:
dont waste money on an intake until you get inside the engine

He may have an iron intake for the 4300 Autolite carb and the carb pad holes need some porting for other carbs to fit correctly so, he'd have to take it off anyway.

I'd run the standard "Performer" simply for the weight factor, lol.

Outlaw5.0

· #6 · Jul 6, 2010

Very nice!, I love those old boats. I would also use the Edelbrock performer, its much lighter, and will give a slight power increase. Make sure to have a friend or engine hoist near to lift the intake off the engine.

Detroit Lincoln

Discussion Starter · #7 · Jul 7, 2010

Thanks. It's always good to get input on parts as I've been out of the game for a while. Keep it coming!

Does anyone recommend a carb for this rig? I was thinking something simple - not high performance. I was thinking maybe a Holley 4160 but not sure how to evaluate CFM. As big as I can afford?

bigblok86ranger

· #8 · Jul 7, 2010

68-71 timing chain and gears

non rpm performer intake and 3310 holley carb

recurve the factory distributor

either dual snorkel your factory air cleaner with a K&N filter installed or install an open element unit with the K&N filter element, If your local emissions laws permit.

A set of 3.50 gears will help SOP and gas mileage around town (may or may not help at highway speeds).

Outlaw5.0

· #9 · Jul 7, 2010

I'm in the Canton area near Detroit Metro Airport, feel free to ask for help.

Detroit Lincoln

Discussion Starter · #10 · Jul 7, 2010

Thanks Outlaw. Seems there are a few people in my area. The car was built in Wixom and the trans was made in Livonia... it's home!

I am not very informed about drive gears. I plan to do most of my driving around town and in city traffic. Less of the driving will be on highway but there will be some. What factors go into choosing a good drive gear?

rmcomprandy

· #11 · Jul 7, 2010

Detroit Lincoln said:
Thanks Outlaw. Seems there are a few people in my area. The car was built in Wixom and the trans was made in Livonia... it's home!

I am not very informed about drive gears. I plan to do most of my driving around town and in city traffic. Less of the driving will be on highway but there will be some. What factors go into choosing a good drive gear?

If you are talking about simply keeping the maintainance down and not guzzling gasoline; (and using as much gear ratio as you can without having tooooo much), then whatever gear ratio is about 1,800 to 2,400 RPM on the highway at 60 MPH with your tires trans and torque converter.

TorinoGT

· #12 · Jul 7, 2010

Great looking car. I love those old 70's mark IV's and V's.

hope to see you on Woodward!

The Mad Porter

· #13 · Jul 8, 2010

Since those suggestions seem to have been pulled from my how to desmog your 70's 460 i am going to chime in here.

All suggestions here are very valid. When Randy malick speaks pay close attention to him.

I would add that you are dealing with a very heavy automobile so TORQUE is the name of the game here. Given the miserable factory 7.6 to 1 static c/r anything you can do to get c/r into the 8's will help measurably. Deck your heads .035" and if you are so motivated port them for an easy 40 HP increase.

Just doing the aforementioned will get you to about 270 HP from the miserable and accurate 200 HP rating. Porting adds on top of this.

If you wish to delve further into the combo i have a truck combo that works beautifully in the old land yachts.

Budget ported small valve D3's and 8.5 to 9 to 1 static c/r.
Voodoo 213/219 camshaft
early timing set
FPA shorty headers are a bolt on. 6126 hookers work too with some tweeking per the post already on this forum.
Adding gear is crucial for light to light performance.

3310 750 holley
performer intake
properly curved dizzy

This combo will make 380 to 390 HP all day long and just short of 500 pound feet or torque.
This will send bertha sideways on demand. We recently did this identical combo in an F250 PickUp and that 5000 pound cow just plain rocked...

Hope this helps.

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Detroit Lincoln

Discussion Starter · #14 · Jul 9, 2010

Thanks for the extra info porter. I'll definitely look into getting some work done on the heads after the other things are done.

AndyMarkV

· #15 · Jul 9, 2010

Detroit Lincoln said:
- New timing chain from 70ish Lincoln that isn't retarded by 8 degrees
- Look into dual exhaust unless current exhaust is already 3" in diameter
- New intake manifold and carb to replace stock Ford carb
- Recurve the distributor
- Dual snorkel air cleaner

I did kind of what you're looking for to my father in-laws Mark V.
If you are going to do the above items all at the same time, I would consider a small cam.
With the timing chain and intake off you would only need to remove the valve covers to do the swap.
We ran the small summit racing cam with a Carter 625 cfm carb and it work really well.

I'm going to go against the grain on lower gear ratio..... On our mostly stock car, lower gears didn't seem to help much. The lower gears seemed to always have the motor out of its power band, too much RPM.
It really liked 3.00 gears. If you had 2.50's, I'd suggest a swap. But with the 2.75's...you might be OK with a mostly stock motor.
We are now turning 3000rpm @ 70mph with 3.50 gears and 29" tall tires. Its not bad, but it would get old on a long cruise.

I will also suggest if you build a motor follow all the tips listed to the letter. I built a half assed cheap motor and should have waited until I could afford the right parts.

Here is a link to my build up, you can also search on my user name to find other random Lincoln build-up threads. (I just found out you can firm up the handling dirt cheap....)
http://www.460ford.com/forum/showthread.php?t=131862

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Detroit Lincoln

Discussion Starter · #16 · Jul 9, 2010

I think of all of the things that are on the list, the rear end is the one I need to do a lot of thinking on. Andy, I can see what you're saying about the long drives, but my guess is that living close to the city I will see a lot less "cruising speed" driving than you do living in what looks like upstate NY. That leans me toward perhaps a 3.50 gear, but that will be the last thing I address probably, after having had time to think on it.

Also, that's a nice thread you made there on the Mark V. It gives me inspiration and a lot to look forward to. Looks like a nice ride.

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