DOHC mod motor question

4251 Views 41 Replies 7 Participants Last post by Monkey Boy, Dec 21, 2005

Willystyle21

Discussion Starter · Oct 20, 2005

Usually in the classics, want to put a mod in my 67 Fastback. But the small amount of displacment always bothered me. I want to know if the 5.4s can take the 4.6 dohc heads. As well as what is the largest amount that the 5.4 can be bored/stroked to. Was going to put a 390FE but because of weight and the fact that I am merging technologies I wanted the mod. Is all I have a pipe dream, or can it be reality without Bill Gates checkbook?

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meatball

· #2 · Oct 20, 2005 (Edited)

3

www.modularfox.com
http://www.stangparts.com/home.cfm?section=howto/index and look at the 40 Ford.

Engine width is issue; basically same as the 427 SOHC cammer motors from the late 60's - believe major shock tower mods required.

What about using DOVE aluminum block and DOVE or Edlebrock alum heads on FE install?; not cheap but huge weight savings. An EFI 302 (327/331/347) swap is pretty straightforward and all parts easliy obtainable and least expensive.

http://www.doveengineparts.com/
EFI install/wiring document:
http://home.cfl.rr.com/custommustangs/
New MM&FF has 430hp 347 pump-gas w/carb build article

Sean Hyland has big-bore block available (and some other neat stuff):
http://www.seanhylandmotorsport.com/

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BlueStreak03

· #3 · Oct 20, 2005

There are a few 5.0L stroker kits available for the 4.6L engines. I woudln'' worry too much about the small displacement issue. These motors can make some really awesome torque when the heads, cam and intake package are well thought out. I saw last night where someone is making 560+ rwhp with a blown mod motor.

Monkey Boy

· #4 · Oct 21, 2005

A 4-valve 4.6 or 5.4 will both be heavier than an FE block. The 4.6 heads will fit on a 5.4 and the 5.4 can be maxed out to 380+ cubic inches.

Willystyle21

Discussion Starter · #5 · Oct 23, 2005

heavier than an FE???

The reason I was going with a mod was weight/technology. How is a mod motor heiver than a FE. Everywhere I have looked said the FE blocks weigh in around 700 pounds. My original idea was going to be a 428 FE with EFI. Or a probe 427 if I could ever afford it. I know about the shock tower issue. DVS restoration has given me all the info needed to slam a mod into a classic stang.

Meat, yep easy attainable and damn near what everyone else is doing.

Monkey, thanks man thats what I needed to know.

Willystyle21

Discussion Starter · #6 · Oct 23, 2005

Meat,
by the way the 65 Cammer did not run at press time when it was unvieled..... Learned that from the owner of DVS.

meatball

· #7 · Oct 23, 2005

Monkey Boy said:
A 4-valve 4.6 or 5.4 will both be heavier than an FE block. The 4.6 heads will fit on a 5.4 and the 5.4 can be maxed out to 380+ cubic inches.

- We'd want to see some facts; can't believe mod motor anything close to weight of boat-anchor FE.

meatball

· #8 · Oct 23, 2005

Willystyle21 said:
Meat, yep easy attainable and damn near what everyone else is doing.

-- oh, trust me, I like the mod-motor idea as well as you do.

tripleblack

· #9 · Oct 23, 2005

Mod aluminum

If you want to shave additional weight, find an aluminum block mod - 70 pounds lighter (explorers have them, and are common enough in the wrecking yards).

FE is more compact package than the wide-body mods, but definitely not lighter. I went through this discussion a while back, but I don't still have the data, and we were discussing a bare block's weight, but the eventual findings were very clear - the FE is heavier by quite a bit. I will dig out all the facts if someone wants to argue, but I'm lazy now, so later...

tripleblack

Willystyle21

Discussion Starter · #10 · Oct 23, 2005

Triple,
Thats why basically the only way I was going to go with mu first idea was if I had a Shelby or Probe aluminum block.

I know the mod motors are wider than the FE's. Any way that the 5.4 can be bored/sttroked to hit 390? Really nostalgic about the number.

tripleblack

· #11 · Oct 24, 2005

383

I've seen a 383 stroker write up, MMFF some months back I think, so perhaps with 30 over you'd be there. Math is a little over my head, but that seems about right...

tripleblack

Willystyle21 said:
Triple,
Thats why basically the only way I was going to go with mu first idea was if I had a Shelby or Probe aluminum block.

I know the mod motors are wider than the FE's. Any way that the 5.4 can be bored/sttroked to hit 390? Really nostalgic about the number.

BlueStreak03

· #12 · Oct 24, 2005

check these out http://www.jegs.com/webapp/wcs/stor...goryId=28665&parentCategoryId=10719&langId=-1 it says the tall blocks are clearanced for a total of 387 cubic inches.

Monkey Boy

· #13 · Oct 24, 2005

You can't quite reach 390 cubic inches with the 5.4. I don't have written documentation that mod motors are heavier than FE's. I do have my trusty Backometer, though. My backometer says that back when I sold engines where I work and before I started working out, I could drag an FE shortblock across our warehouse floor by myself but I needed help doing the same thing with a 4.6 shortblock.

Here is my suggestion, Willy. Find a 351W and bore and stroke it out to 390. You'll get the cubes you want, you'll save a bunch of weight, and you'll save a ton of money since Windsor parts are much cheaper than FE and Mod parts.

Willystyle21

Discussion Starter · #14 · Oct 24, 2005

couldn't find specific weights for the mod weights except for the weight of the block which is 86 pounds...... The only weight for the fe engines I could find is 680... I know there are not proper comparisions but it would seem that the mod is much lighter.

Monkey Boy

· #15 · Oct 25, 2005

Willystyle21 said:
couldn't find specific weights for the mod weights except for the weight of the block which is 86 pounds...... The only weight for the fe engines I could find is 680... I know there are not proper comparisions but it would seem that the mod is much lighter.

Is that an iron mod or aluminum mod? An aluminum would be lighter but an iron should be heavier if my Backometer is correct.

Willystyle21

Discussion Starter · #16 · Dec 19, 2005

What about the navigator moto? I have heard good things about it and throeing a charger on top shouldn't be to hard. If I found a smashed cobra that is.......

blackfang

· #17 · Dec 19, 2005 (Edited)

2

Stay away from SHM products as he will not stand behind his engines and way too many people have been screwed by his horrible products. I would also fray away from stroking the 4.6 as it already has a big stroke, just as much as a 351 stroke.

Some have gotten nice gains with the 5.4L 4V navi motor(Al papito with Boss 330Racing is doing one right now)
Here is his 5.4L navigator engine that has ran 10.3x on motor

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blackfang

· #18 · Dec 19, 2005

2

Here are some pics of Al's latest 5.4L 4V

The 5.4L in his cobra (NMRA MM #9) now makes 520+ rwhp naturally aspirated.

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Willystyle21

Discussion Starter · #19 · Dec 19, 2005

oh God I'm in love.......... You know where I can get that specific info on his engine? I would really like to have it. Thanks by the way.

blackfang

· #20 · Dec 19, 2005

Contact him at www.boss330racing.com

Granted some assclowns on here doubt this guy, but then again half of them have never really turned a wrench or seriously took a stock motor and tried to see how much hp they really can make. Yet they read about him in the magazines.
The same idiots on this site doubt the info markwondi gives, Funny, because he gets it right from Al, who you just saw. He builds alot of the NMRA cars. He also build the 2004 NMRA Factory Stock champions motor, yup Bob Cosby

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