Exhaust Manifold Help For V8 Swap

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hicruise55

hicruise55

IH8MUD VOYEUR
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I have searched and searched on here and spent all day at 7 wrecking yards and still cannot find what I need :mad:

I am putting a '91 Caprice 5.7l into my FJ62. On the '91 motor the passenger side exhaust manifold dumps at the far back an interfers with the firewall. Does anyone know an application that is center dump or 3/4 and retains the air injection system? Don't really want headers, and the manifold I have couldn't really be modified enough to work???


What have others done? What are my options other that headers and welding in bungs :confused:

Thanks Guys and Girls
 
The Drivers side manifold from the same engine will fit on the passenger side. You can also find new "Chineese" Rams Horns with air injection.
LINK
 LINK2
Dynosoar
 
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The far back two bolts (on this manifold), to the head look like they have a greater distance between them than the older manifolds? I figured it is was a different bolt pattern?

Well I'm gonna go rip it off and do some measuring?

Everybody feel free to chime in! Thanks agian
 
The heads for both sides are the same. The last hole is double drilled so it should work fine.


Dynosoar
 
The heads on Chevys are identical from side to side so, therefor, the exhaust manifolds are too. Just dump it forward and route it around to the driver's side where you can join it to the other exhaust. I run block hugger cheap-O-matic headers and route my passenger side around and under the front of the motor into a single 3" pipe and on out the back. Not enough room, in my opinion, to try to do a dual exhaust on these wagons although I'm sure somebody is going to post that thay have done just that.
 
Very interesting idea? I'll have to take a look.

My manifold that I have now has an air injection tube at each exhaust port, if I were to go to Rams Horns would I have to re-bend all new tubes or could I just do one big tube at the center?
 
I moved my transmission forward before welding the engine mounts, which cleared it just fine. That allowed more space for the HEI distributor as well.
 
hicruise55 said:
Very interesting idea? I'll have to take a look.

My manifold that I have now has an air injection tube at each exhaust port, if I were to go to Rams Horns would I have to re-bend all new tubes or could I just do one big tube at the center?
Click to expand...

some of the rams horn manifolds have the holes at each cylinder, just like the corresponding "normal" manifold. I think your AIR pipe should work on the rams horns. Unless maybe the angle is different or something. If you don't have emissions worries then the AIR crap would go in the dumpster if it were me.
 
IT woould appear that the referenced corvette manifolds would work. Or the old School so called rams horn manifold works. I have the chinese versions from NAPA of the old school rams horn manifold. I think they are patterned after something like the 68 vette. One of the web sites that deals with land cruisers and engine swaps has a reference to a GM manifold (it may be TLC), anyway I used that number and went to NAPA and had them match it. BTB has the manifolds but they look to be a little expensive. If you can find any corvette stuff in the junkyards you will be lucky. Go down to your NAPA store, ask them for exhaust manifolds for a 68 corvette (small block) and look at the picture. I'm pretty sure you'll be looking at the ones I bought. If you search you will see my thread on my V-8 swap (among others) I believe there are a couple of pics showing these manifolds.
 
Awsome! thanks for the replies guys, I think I am gonna look into the '85 Vette manifolds.
I guess now the next question would be... It looks like the Vette manifold driver side does not have a provision for the O2 sensor, will it make a difference if I bung/weld it in the exhaust tubing or should I just drill and mount in in the manifold still?

Thanks agian!
 
They put mine in the exhaust pipe that connected to the vette manifold. They worked great for me. It will need an egr block off plate on the pass side. I made one out of a piece of scrap metal I had. I have had no issues with them and they passed inspection. Let me know if you want pics.
 
Be prepared to re-tighten bolts & change gaskets fairly often with tube headers. OTOH rams-horn headers hold a LOT of heat (looking @ scar or wrist) & require extreme measures to keep plug wires from burning & shorting out.
 
Well I got real excited about the C4 Corvette manifolds, found some on CL and no call no show??? Called a somewhat local Corvette parts house and was told "ya, I have lots of them but are really prone to cracking...you can come down and see if we can find some that are not cracked and will work for ya" I said what is the ballpark cost for these? "Bout $300!". So I figured I would call GM if I'm gonna spend THAT much... no longer made or available from GM. Next call goes to Napa-says his parts catalog stops at '83...WTF???

So anyway I just ordered a set of shorty headers and the Headman air injection kit as well as a weld in bung O2 fitting.

Now I just need a K&N, a throttle body spacer, and a bunch of stickers and i'll be getting 25mpg with 500hp! :D
 
I would love to run the rams horns, in fact I even have some, but realistically (time wise) I cant run the air injection on them. I am just gonna slap the headers on with the Headman A.I.R kit (weld in tubes for air injection) and keep looking for manifolds that will work or modify some to?

I might make a move back South and want all my emissions to be in order just in case?
 
Why not? they have the holes for the A.I.R. I plugged mine, so I know they're there...
 
yea...not following why you can't run the AIR pipe if you want to?

Headers are the biggest pain in the @$$... if you want something to melt plug wires, run headers, if you want to melt anything close to them...same thing, if you want exhaust leaks...again same deal, if you want to burn the "ever-loving-hell" out of your body parts... get near the headers at the wrong time. Headers may the easy route right now...

I like the rams horn manifolds, had zero problems with mine so far. Personally I would only run headers if I had no other options.

The only problem I know of on the rams horn manifolds is...if you have an egr pipe that has to mate with the exhaust.
 
hicruise55 said:
I would love to run the rams horns, in fact I even have some, but realistically (time wise) I cant run the air injection on them.

*The Rams horns I have are not drilled for the air injection and time wise I'm not gonna drill/tap some crusty old manifolds

I am just gonna slap the headers on with the Headman A.I.R kit (weld in tubes for air injection) and keep looking for manifolds that will work or modify some to?

*Previously stated- I would like to keep manifolds. But agian time wise- I need to get this truck back on the road (my other Cruisers dont have tow hitches for my boat! The king salmon are running!) I WILL get the manifolds I need and route all the lines but... TIME :mad:
Click to expand...

Thank you so much for the time and info, somehow I couldn't find the Rams Horns drilled for A.I.R. on my own? But this way- I dont have to be rushed plus I can get them ceramic coated and all
 
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