I purchased a P4510581 Mopar Performance intake for my 5.7 swap. This is the single 4150 carb version. I noticed the flange side has grooves cut like it uses o-rings. Gaskets I have found say to use flat gaskets on aluminum intakes and not the factory style with the seals on it. Which is correct? Also how to find an install kit with bolts and water outlet.

Oh, I remember that issue.

There are two versions of that particular manifold, EFI and carb.

Both versions are (or at least, were) machined for OEM stock 5.7 O ring style gaskets.

About two years after crate engines that used that intake started selling, through customer feedback, MP found certain blends of gas, with the carbureted versions of the intake, would "swell up" the O rings over very long term use.

Subsequent contact with the "intake gasket guy" at Chrysler proper + the OE supplier for the O rings confirmed: They are not intended for long term exposure to liquid gasoline. Short term and vapor is OK.

By then, another crate engine had been released, with the predecessor to the tall DP intake on it. It did not have the O ring machining....That engine had pink fiber gaskets. Spoke with engineer for that program, he knew what the deal was. There were similar 5.7 fiber gaskets set up in the product line "just in case".

At the time it would have been damn near impossible...like an act of Congress....to change the machining on the intake. Requiring a new blueprint, PPAP, and all that "OEM" stuff that most other folks who make intakes don't have to deal with... Chrysler was bankrupt at the time, and the only reasonable solution was to recommend fiber gaskets and leave the machining alone. So that's how it happened.

You actually "can" use the O rings over the short term, and it will run just fine for you, but over time they will break down and swell up...it kind of depends on how often you run it and other factors. Although they were intended for a "dry" manifold, they can handle fuel for awhile.

BTW the big threaded hole in front is where the oil goes, there's no water in a Gen3 intake.

Wow, oil in my water hole, showing my lack of knowledge aren't I. I got the 4150 intake to run an aftermarket EFI without fuel bars and I didn't want the injector openings either.

So, I run the o-ring gaskets and just keep an eye on them and be prepared to change them? We are going to drive the car a lot and take some cross country trips in it. What would you consider "over time"? Months, years, or miles?

Could I fill the o-ring areas with epoxy and run a flat gasket? Have you heard of this being done?

Do I visit a Chrysler Dealer to get manifold bolts for the early crate motor?

Also, do you know of anyone running the Indy tall valve covers on a b-body with a factory power brake booster? We are installing the engine from the bottom and can lower the k-frame if the valve cover ever has to come off in the future although I didn't think it would be a frequent maintenance issue.

I will try to figure out the oil filler on my own!

Find stock style gaskets made from gasoline resistant material, like FKM. Like this:

http://www.rockauto.com/en/moreinfo.php?...478&jsn=478

An initial glance shows little out there in the way of flat gaskets. Ask Roadhazard to make you some Superformance gaskets.


R.

Cometic has flat gaskets.

Pretty sure P5153757 is the one, but it's been a long time, double check before ordering.

Resurrecting this in hopes of finding a replacement oil filler cap for the MP intake. Mine is missing. Does anyone know of an interchange?

I do not know what size, but im sure one that would work could be sourced. Doubt you would find a factory replacement without it also having an intake under it.

I don't think I kept a copy of the bill of materials for that one.

However if memory serves (and it very well be failing miserably so don't hold me to it), I think the oil cap is most likely the same one as used on Ansen/Keith Black/Mopar Performance Gen 2 hemi valve covers.

Possibly this one
https://www.summitracing.com/parts/dcc-5249949

Might want to go to Ansen and see if they will share any dimensions.

Did you ever find the fiber intake gaskets?
I found the part number the other day at home, if you still need it.

I have some flat gaskets, intake bolts and found that the oil filler opening is 1-1/2x12 thread.

Started researching the MP cap and it is showing discontinued at most places and doesn't show a size. So still checking on that.

Not much in the way of pictures to go on for this. There also seems to be an oil line that runs from the front of the intake and extends down the side and attaches to the rear of the intake.

Also have to figure out a PCV system.

It appears that the MP cap is the correct one, just discontinued. Now to find one!

That looks like the cap S&W and other install on their fab rear-ends. You might want to check with them.

Ask a dealer to do a search for you... might be one on a shelf somewhere.

Does it look like this?


https://www.summitracing.com/parts/mez-pn6550

If so type in rearend cap in the search bar for lots of options.

If your tastes run on the darker side
https://www.summitracing.com/parts/hly-241-229/overview/

The Meziere is too large, it needs to be 1-1/2x12 but the others are good options. The Holley looks like it could be discreet enough to work. Thanks for the help.

Following with another question. What are these two openings on the intake? What goes there and how are they used?

One is on the front under the oil filler cap and the other is next to a runner in the rear.

Oil fill and pcv/breather.

Breather and pcv.

(Oil fill is the big cap, already covered.)

So the PCV valve screws into the threaded opening under the filler cap? Is that a standard 5.7 item that will transfer over to the MP intake? Or something I will have to hunt down or make?

Can't recall if the pcv valve goes in the side or in the front by the cap. It's only been 12 years...

I am pretty sure it is not a 5.7 pcv valve, it is from some other application, 5.7 does not use a hose, crate engine did.

I might still have the crate engine I sheet on cd someplace. Would take awhile to find it, though. (everything is boxed up).

look at an 05 Magnum with the 5.7 for the PCV valve

Google MOPAR 53032531AE
For the PCV

The stock 5.7 pcvs are a quarter turn thing with no hose attached.
They won't work with this intake.

The old crate intake intake uses a pcv from some other application that screws in the front near the oil cap, and a hose runs to it from there.
The valve looks like one from a 2.0 or 2.4.

Run a breather hose to a breather tank, or a small k&N type breather or whatever you've got, off the fitting in the side of the intake.

I have the efi version been searching the same issues. pcv that will thread into small port below oil fill is napa number 2-9627 fits 2.4.

Also could you just machine that breather hole for npt threads and just run a breather right from the intake?

Sometimes it's great to be reminded your memory isn't as shot as you thought it was (thanks)

I knew it looked like a 2.0 or 2.4 pcv but couldn't remember what it was actually from.

Run the NAPA PCV valve screwed into the front of the intake with a hose to one of the fitting son the back of the intake and then a breather hose from the air cleaner to a valve cover?

Run a breather off the port labeled "intake breather port" in the picture above.

Is that nipple what is missing in this picture?

Is that nipple piece still available from Chrysler? Tried searching and calling dealer both came up with nada. measuring the hole looks like it would be easy to machine to 1/4 npt threads which would be much easier to source. Just pisses me off that you have to spend a $1000 dollars for this and can't get parts or have to make stuff work.

Also not to thread hijack in the pic above can you still get the map sensor that works with this manifold? I need a 4 bar cause I have boost. Thanks

Honestly I think it was kind of cheesy, it was just a bubble flared chunk of steel tubing pressed in the hole. If I remember right it was only sold with the crate motor.

You're probably better off creating something different/better.

If I can scrounge up any more instructions that refer to this, I will look for the sensor and let ya know. I remember absolutely nothing about that from my 8+ run working there, but unfortunately never worked hands on with this intake during that time period.

I agree the price is crazy, always has been, the fellow managing the program was somewhat rushed and the casting/machining work ended up going to high dollar prototype shops instead of mp's normal intake foundry out in CA, the one with the "BB" casting mark (buddy bar). He brought the product to market quickly that way, but after he left mp seemed to be no marketing interest in resourcing/managing it. So there it sits, kind of stuck.

Is this where the MAP sensor goes?

Since this is the breather port that goes to the air cleaner, I understand that these engines have a tendency to pump oil out of these ports. I am going to run this to an Air Grabber and really don't want to ruin an oval air filter with oil stains. There were oil catch cans for the Gen III's that people upgraded to in the early days, is this where it was "spliced" into? This might effect how I try to fix the missing fitting issue.

No need to get a special late model catch can, something like this will work

https://www.summitracing.com/parts/aaf-a...h4aAtUhEALw_wcB

Yes I believe that's the sensor location. No I can't remember anything about the sensor itself

First off, I appreciate all the help. I am working toward an OEM type of engine graft and whatever I do has to be hidden. I have access to machines at a tubing repop company and they think they can make me a stainless knock in nipple for the open "port" in the rear. I can even make a line that comes up higher and routes under the air cleaner base to hide something that will separate the oil and air so I can have my breather hose coming off the Air Grabber base. I will start searching for a separator. Something small, I think.