Intake/exhaust manifold separate or together

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chaka

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Okay, so everything I have read says to get a replacement set that has been used together (mating surfaces better aligned). Is there any reason to think that I could pick up a separate exhaust manifold and mate it to my current intake and have a reasonable match (maybe after getting them milled?) or is it better to just pony up and spend the money for new intake AND exhaust together.

thanks in advance
 
You could mate non-paired intake and exhaust together even though they are not a 'matched set' and check with a straight edge to make sure. I have heard the trick is to use two Toyota OEM gaskets sandwiched together to get a good seal. I used one OEM gasket with a stock intake and Man-A-Fre header with no issues after 3+years.

I would clean both intake and exhaust mainfolds thoroughly and check before installing. I believe you can get a machine shop to plane the surfaces that mate to the head if they are off. Good LucK!

Brian
 
Dbarrett,

I bought all the hardware to put on the exhaust system already so I was hoping ot use them. Maybe I am wrong as a newbie but isn't there a bit of welding to be done with sealing off the intake/exhaust mating surface? so that would end up costing me also, plus the header, plus rerouting the exhaust...

maybe I am missing something, it just seemed bolt on replacement would be easiest... not to mention not having to mess with emissions crap (this is CA emissions vehicle).
 
I used a mismatched set on my '76 40 with a '71 F engine in it. I tried bolting it on but wasn't satisfied with the seal on the exhaust side so I had a machine shop mill the assembly for me. It runs great and pulls about 19.5 inches of vacuum. I think the machine work cost about $50.

Leon...
 
No, they matched up fine. What I did was leave the interconnecting bolts loose and torque the intake and exhaust to the head. I then tightened the interconnecting bolts and delivered the assembly that way to the machine shop.
Leon...
 
Okay so here's the other situation...
I am replacing everything in order to pass inspection. Emissions is a part of it, but I am not so worried about that as the reason I failed the 1st time is a rusted out muffler and tail pipe (which led to removing the manifold, stuck bolt...yadda yadda).

So the question is... if i don't have a perfect fit with a mismatched set, what does that mean for emissions tests? I am sure it is dependent on how bad the fit is, but in rough terms... could I pass emissions with an imperfect fit? My goal is to get this thing on the road!!!! it is getting warm here and I am itchin to ride.
 
Chaka,
Ah my newbian brotha! Still pluggin away at this thing huh? god they are a royal f#$ing pain these trucks! I know what you mean about the itch. It was beautiful today I took my Triumph out for a ride and kept thining about taking the top off of my truck and going for a cruise, BUT alas it's apart again.

Back to the story. I assume you found a proper ex manifold right? You should be able to have that thing machined to a reasonable level of tolerance. Just be sure to specify that the manifolds must be the same thickness measured at the bolting surfaces. they should understand this MAKE SURE they do! I torqued my manfolds up first and then torqued them together on the head... this may or may not be right. I bought a new gasket for mine and plan on having this thing planed and trued again, this time properly. I will use a duble gasket. I did manage to tighten up a mainfold n=bolt and smear some rtv around the thing and it sealed up but I don't know how long that will last. I have to retune the carb now!

Hey let me know when you get that thing running, we'll have to hook up with capital cruisers for the coal miners classic this spring! Take care. ken
 
plaiii said:
No, they matched up fine. What I did was leave the interconnecting bolts loose and torque the intake and exhaust to the head. I then tightened the interconnecting bolts and delivered the assembly that way to the machine shop.
Leon...
Click to expand...



Chaka, this is the way to do it.

GL

Ed
 
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