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'71 k502 The Misfit

Went and messed around with the project today and got some answers I was looking for. Firstly I called GM performance parts and got a straight answer on which header flanges to use for the 502ramjet head port design (it was the round flanges) I was always of the opinion that my heads had a square port.... All the literature said I had oval ports (try finding an oval port flange?) Upon closer inspection the port is more or less flat on the bottom and round on the top.

As to my -5AN fuel return fitting dilemna, the story gets even weirder. While the book says it has a -5AN fitting for the return, the bag of engine goodies contain two bent lines, 1 that was 3/8 and one that was 5/16 and the ends were some kind of female flare connection like you would find on your trans cooler lines.

Got some of my handmade header parts coming from Jegs as we speak, I really wanted to build these out of stainless, but my wallet can only bear the mild steel version. I am very excited to craft the most kick ass set of custom headers for my project. I will take the headers outside the frame rails, tie into some real trick merge collectors and from there a set of Magnaflow 4" round straight through mufflers with 3 1/2" turndowns after the muffler.

One of the worst things I tried to do on this entire project was attempt to utilize a set of Hooker Super Comp Shorty headers (when I called Hooker, they didn't even pause when saying their Shorty Super Comp would eat 50hp) I started making terrible decisions in order to try and make something lame work and almost had some super ghetto fab to show for it. So glad I stopped where I was at and decided to custom make an entire set of headers.
 
I got to mess around with a buggy today that had a 502 ramjet in it and it was neat to compare one that was fully installed and running with my engine that is well on it's way to running. Interestingly enough the headers that were handmade for this buggy are nearly identical to what I need to make for my beast.

It would seem that my iteration of the 502 ramjet also gained a threaded boss in the upper intake plenum for the IAT. I remember reading about the first wave of 502 ramjet owners having to come up with their own location for the IAT and it not being the best solution.
 
ashman said:
maybe ask zimmer. he just went through a bunch of fuel fittings issues and might be able to point you in the right direction.
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:bow:

fishinnutt said:
Went and messed around with the project today and got some answers I was looking for. Firstly I called GM performance parts and got a straight answer on which header flanges to use for the 502ramjet head port design (it was the round flanges) I was always of the opinion that my heads had a square port.... All the literature said I had oval ports (try finding an oval port flange?) Upon closer inspection the port is more or less flat on the bottom and round on the top.

As to my -5AN fuel return fitting dilemna, the story gets even weirder. While the book says it has a -5AN fitting for the return, the bag of engine goodies contain two bent lines, 1 that was 3/8 and one that was 5/16 and the ends were some kind of female flare connection like you would find on your trans cooler lines.

Got some of my handmade header parts coming from Jegs as we speak, I really wanted to build these out of stainless, but my wallet can only bear the mild steel version. I am very excited to craft the most kick ass set of custom headers for my project. I will take the headers outside the frame rails, tie into some real trick merge collectors and from there a set of Magnaflow 4" round straight through mufflers with 3 1/2" turndowns after the muffler.

One of the worst things I tried to do on this entire project was attempt to utilize a set of Hooker Super Comp Shorty headers (when I called Hooker, they didn't even pause when saying their Shorty Super Comp would eat 50hp) I started making terrible decisions in order to try and make something lame work and almost had some super ghetto fab to show for it. So glad I stopped where I was at and decided to custom make an entire set of headers.
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I'm sure you know a -5AN is a 5/16" size...if it happens to be metric threads, it would be 8mm. There are adapters made to go from metric to AN and vice versa.
the Inverted Flare fittings are the trans cooler type fitting. Can you measure the TPI count with a thread gauge?

Oh and the truck is bitchin' too, that's why I'm here!
 
I'm glad you got rid of the shorty headers, I figured they would choke your engine down a bit but since you already had them I didn't want to reign on your parade, because your rig is pretty sweet.

FYI, oval vs rectangular port is the intake ports, not the exhaust ports, but maybe you already knew that.
 
CUCV2 said:
Found some fitting in my travels. Not sure if it is what you are looking for but here you go.
http://www.siliconeintakes.com/index.php?cPath=17&osCsid=a4e1d9c517ddef18215e2f8bc81071c1

Let me know how it works out :thumb:.
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That site is something else, if they don't have it, you don't need it.:D I am going to browse through what they have until I find the piece I need.
So far the reading provided with the 502 Ramjet has provided two mysteries, one was said the fuel fitting was -5an and it turns out to be a 5/16 flare like a tranny line and the other is regarding the placement of the IAT sensor.
 
Got some of my exhaust parts in today and I am so stoked to begin this phase of the project. 3/8 header flanges with 2 1/16 round holes, slip on merge collector (way cool), stainless steel magnaflow mufflers and 3 1/2 turndowns. I got whole pile of DOM J bends in mild steel 2" 16ga. to get me started. This is going to be fun, and I will probably never forget making these one way or the other.....lol:D Hopefully tomorrow I will have some progress pics

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folkenheath said:
I'm glad you got rid of the shorty headers, I figured they would choke your engine down a bit but since you already had them I didn't want to reign on your parade, because your rig is pretty sweet.

FYI, oval vs rectangular port is the intake ports, not the exhaust ports, but maybe you already knew that.
Click to expand...

Those shorty headers and some of the mods I was trying to make them work was such a joke, I needed to take a step back and reappraise things. If I had been a little more stubborn I would be in deep trouble by now. I learned a lot more about exhaust tek in my journey for sure.
 
fishinnutt said:
Got some of my exhaust parts in today and I am so stoked to begin this phase of the project. 3/8 header flanges with 2 1/16 round holes, slip on merge collector (way cool), stainless steel magnaflow mufflers and 3 1/2 turndowns. I got whole pile of DOM J bends in mild steel 2" 16ga. to get me started. This is going to be fun, and I will probably never forget making these one way or the other.....lol:D Hopefully tomorrow I will have some progress pics
Click to expand...

I'll be watching... :waytogo:

I've found a number of great articles (HOT ROD, etc) on header building tricks and tips. The one I really like is the LEGO-style header design kits they make now.... Its something like 50 small curved plastic click-together sections that can be rotated and connected to a BBC header flange. Each one is marked with index points so that whey of get a header that bends and twists the way you want it you fill out a worksheet noting all of the index points and it then helps you precisely replicate the entire thing in steel. :bow:

I like everything about it, except I think it's about $700 for the kit.... :doah:


-G
 
Got started figuring out where all this exhaust tube is going to go. I grudgingly decided to start on the difficult side, I am sure I will thank myself later. I began making the flange fit the head, oddly the hardware that holds the head on interfered with these flanges and the Hooker Super Comp Shortys I had. The buggy at the shop with the 502 Ramjet in it had seperate flanges for every tube and they had to grind those same as I did.

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Nothing too crazy, just getting a feel for how it is all going to layout. I was surprised how long it took me to gain any momentum. I spent most of the time getting my methods figured out so I can just turn the rest of the project into small repeatable procedures. Making a six inch Magnaflow muffler fit nice under the floor board will be a challenge and still have my boatside and not cook us all and......
 
Gonna have to replace the steering shaft, (im sure you knew that) but thats REALLY dangerously extended. headers are gonna be SWEET:thumb:
 
shady said:
Gonna have to replace the steering shaft, (im sure you knew that) but thats REALLY dangerously extended. headers are gonna be SWEET:thumb:
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That shaft is going to be ditched in favor or a multiple borgeson joint setup that jogs around at all kinds of angles, supported with a spherical bearing. I moved the factory box far enough forward that the factory shaft doesn't even come close any more.
 
Starting to make some decent progress and I more fully understand what I am up against now with using a steering box, coil overs, and just how tight it all has to be with a 43" tire even with the front axle pushed forward.

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man, that looks like a crazy amount of work! should be awesome when you get it all figured out though.
 
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