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[r3dn3ck]

I bought a set of C-heads. Judging from the casting data they appear to be from a late 99 or early 00 navigator. I picked navi heads deliberately. I don't have worries about the 4-thread issue or the driver side head cooling, one is not really a problem and the other is not at all a problem with the addition of one little hose. True, the 4.6 bottom is a little small for the port volume so it'll cost some torque at the lower revs but it'll sing at the top and the car will end up with 3.73 or 3.90 rear gears so it needs the rev range pushed a little to the right anyway so first gear isn't rendered completely futile. A little porting on the exhaust side and port matching on the intake side and they should be just right for 8000+rpm. Have to send them out for freshening which I'm betting will be probably 2 grand. Need to find some FR500 spec cams and snatch up Mr. Secondary Timing Chain's block so I can start assembling rotating assembly components.

I almost bought a 5.4L bottom end at the same time but decided an aluminum 4.6L saves me a lot of hassle and a huge amount of weight off the front end so I'll stick with it.

.

 

[Snorky]

Soon.

View attachment 30405

Ahh hooking up the infamous Hanz O pipe exhaust with the side skirt induction system
.. risky business

 

[white95]

Ahh hooking up the infamous Hanz O pipe exhaust with the side skirt induction system
.. risky business

If you aren’t living life on the edge, you’re taking up too much space.

 

[96blak54]

I bought a set of C-heads. Judging from the casting data they appear to be from a late 99 or early 00 navigator. I picked navi heads deliberately. I don't have worries about the 4-thread issue or the driver side head cooling, one is not really a problem and the other is not at all a problem with the addition of one little hose. True, the 4.6 bottom is a little small for the port volume so it'll cost some torque at the lower revs but it'll sing at the top and the car will end up with 3.73 or 3.90 rear gears so it needs the rev range pushed a little to the right anyway so first gear isn't rendered completely futile. A little porting on the exhaust side and port matching on the intake side and they should be just right for 8000+rpm. Have to send them out for freshening which I'm betting will be probably 2 grand. Need to find some FR500 spec cams and snatch up Mr. Secondary Timing Chain's block so I can start assembling rotating assembly components.

I almost bought a 5.4L bottom end at the same time but decided an aluminum 4.6L saves me a lot of hassle and a huge amount of weight off the front end so I'll stick with it.

View attachment 30406. View attachment 30407

Navi heads for a 4.6l and port match the intake side? Is that possible? Correct me if im wrong but arnt the navi intake ports substantially bigger?

 

[RAU03MACH]

we talked about it one time
i thought slightly larger

 

[RAU03MACH]

when i was messing with my mach1 engine

 

[r3dn3ck]

Valid points and it comes down to thinking about the system as a whole. Because I want more top end pull I need more port volume. Adding port volume causes a reduction in air velocity which reduces the tumbling effect of the C-head design which helps with fuel mixing especially at low throttle blade angles. I would probably have issues with emissions if I don't fix that problem. So, how to enhance fuel mixing without sacrificing top end flow? Easy. Science.

So, yes, they're quite a bit bigger at the mouth than a cobra/mach but there should be enough meat in the manifold where I need it. It will be a little thin around the injector boss but it'll hold. The idea isn't to improve air flow, it's to create a very small area of very slightly lower pressure right at the injector nozzle for better fuel mixing. That'll fix the issue of low air velocity at low throttle angles reducing the tumble port design's effectiveness in that regard. Liquids vaporize easier at lower pressures, so I just have to cause a brief pressure drop in the incoming air charge just as it passes the injector but not so much so as to cause too big of a temperature change. So, less than about 2000 pascals based on some very rough back of the napkin math. All I need to do is get the mouth of the intake to the same size as the mouth on the head or close enough that too much turbulence isn't induced. I'll have to do some work inside the manifold too in all probability. Won't know for sure until I test it with the makeshift flow bench I have at work (we use it to make sure some server racks that run insane power densities aren't going to have issues with condensation). I have a spare intake manifold that I can mess with so I'll just get my drill and tap on and instrument it with pressure sensors and see if I'm going to need to mess with the inside of the intake manifold. What I want to avoid is air density bouncing up and down before it gets to the injector boss. I want to see a more or less a flat line on the graph with a small dip at the injector and then a small rise about an inch farther down toward the valves.

 

[96blak54]

More top end pull? .....Where will these rpm's be extended to?

 

[RAU03MACH]

Any one know this part is
Some of you may

 

[RAU03MACH]

More chevy parts on a ford jeez

 

[lwarrior1016]

More chevy parts on a ford jeezView attachment 30419

If you have problems with that tps, get a Delphi sensor. They are more stable.

 

[RAU03MACH]

We're would you get them at
Not a cheby guy so I don't know
I thought ac Delco were ok

 

[white95]

If you have problems with that tps, get a Delphi sensor. They are more stable.

100%

 

[r3dn3ck]

More top end pull? .....Where will these rpm's be extended to?

About 2000rpm to the right.

 

[rio_snek]

This is a new/old purchase for me. I owned this car for several years, then got to a point in the build where I felt like I had done everything I wanted to do with it, so I parted it out and sold it. I've regretted that decision pretty much since the day I let it go, but I finally had an opportunity recently to get it back. Now it's time to work on bringing it back to my vision of it.

 

[badass98svt]

I like it with the tribars

 

[rio_snek]

I like it with the tribars

Yeah it's not a bad look for the time being. They definitely need spacers, I feel like I could stick my head in between the wheels and the fenders.

 

[96blak54]

The tri bars give the car a refreshing look. Not the same old wheel selection. Perhaps get the wheels corrected and widened? Or is their an aftermarket tri bar replica thats made to fit our desired upgrades. Anyhow....it looks great.

 

[rio_snek]

The tri bars give the car a refreshing look. Not the same old wheel selection. Perhaps get the wheels corrected and widened? Or is their an aftermarket tri bar replica thats made to fit our desired upgrades. Anyhow....it looks great.

The guy I bought these from had a set of 10" wide ones on his car, which was his reason for getting rid of the stock spec ones. I haven't been able to find any like that anywhere else though, so I don't know if they were widened by someone or what.

 

[96blak54]

Could always widen the wheels then space them out or swap rear end to a longer rearend like from a crown vic. Probably more headache than its worth, but its all about what you want. But i have to say, im turned on the the tri-bars now....lol