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Exhaust Thread


Braden

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Hi all,

 

510 expert  Ron told me to post a pic of my L20B manifold hoping that someone could identify it.

 

Please let me know what you think it is.

 

Respectfully,

 

Brian

 

B87D7A60-80BB-423F-A7B8-5E62D6548099_zps

 

 

 

 

 

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That looks like the stock 4 into 2  510 exhaust manifold which is basically a cast iron header. So when the L20B was installed it was just bolted up to it. All L18 engines used the same or similar 4 into 2 exhaust. Only L20B that used it was the '74 610. All other L20Bs used a 4 into 1 log exhaust manifold.

 

You have a '69 so probably have the individual air pump tubes in the top of each exhaust pipe where it exits the head. They may be cut and crimped or plugged or welded.

 

IMAG7406.jpg

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There are two different varieties of that manifold that I know of. One of them has siamesed runners just before the collector/outlet flange. The other, which is the one I like, has the runners completely separated all the way through. Just like a 4-2-1 header.

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  • 1 year later...

Here's mine. It's the stock manifold L18 manifold and the stock 2-1 pipe and then after the merge I built it with 2.25" stainless tubing.  I used a Vibrant resonator, I think 9" in length, and then a Magnaflow 4x9 offset muffler.

 

Sorry, I'm not good at making videos; not sure where that double pan thing came from.

 

 

Before I got the tailpipe done...

7NLrpC7.jpg

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V5o9o8x.jpg

 

This is the one you want on the left. 1 & 4 and 2&3 together. Some later ones just dumped into the center but had the two outlets. Keeping adjacent cylinders from firing into each other.

 

 

I have an L16 exhaust manifold on my L20B connected to a 'modified' 240sx down pipe grafted to the resonator under the floor. The Y pipe join is about 33" from the exhaust valves, like a long tube header. The pipe back has an expander to a new 2" muffler from a yard sale and a 45 degree down outlet.

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On 8/7/2016 at 7:43 AM, KamakSun said:

Hi all,

 

510 expert  Ron told me to post a pic of my L20B manifold hoping that someone could identify it.

 

Please let me know what you think it is.

 

Respectfully,

 

Brian

 

B87D7A60-80BB-423F-A7B8-5E62D6548099_zps

 

 

 

 

 

 

It looks just like mine. I've lost track of what I pulled it from, but it's one of the true 4-into-2 ones with no air injector pipes. 

M9nr9Ky.jpg

xIN5Sru.jpg

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 The earliest use I know of, of an L20B, was in the '74 610. That might be from one... maybe.  They didn't have the air injection pumps. All other L20Bs starting in '75 were the co joined intake/exhaust manifolds. Not even close to looking like that one.

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Ok, I have to remove the old studs from a L16 exhaust manifold that connect to the down pipe. Any suggestions on how to go about it with out having to drill them out.

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19 minutes ago, edekalil said:

Ok, I have to remove the old studs from a L16 exhaust manifold that connect to the down pipe. Any suggestions on how to go about it with out having to drill them out.

 

Heat and PB blaster?  If they are as rusted as mine were they will probably break when trying to remove them and you will have to drill them out regardless.  

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Just snap them off and remove the exhaust manifold. Take to someone with a torch. If there are nubs heat around to yellow hot and vice grips will easily turn them out. If snapped off flush you can only drill them for an easy out, then heat with a torch and turn them out. Did this with my L16 manifold and they screech but turn easily. I can't imaging doing this on the vehicle. I replaced the studs with SS and extra long brass? or bronze nuts. They looked kind of yellow? Several years later I took off for a wide band and they were pristine.

 

You can see where the heat was applied...

otASYRV.jpg

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On 8/7/2016 at 4:40 PM, datzenmike said:

I think the later L18 ones were the ones to avoid. Anyway, top one... avoid. Bottom is better

 

http://i138.photobucket.com/albums/q251/datzenmike/L%20Z%20Heads%20and%20Motors/standardand4intotwoexhaust001.jpg

I had one of each of these around. Found out the preferred one has a hole in one pipe which a welder friend said he could brass it closed plus the studs at the down pipe connection are in bad shape. The other was in better shape with no hole. So I gave it to him to get the studs out. We'll see how it goes. I'll stop by and pass your info on about getting them out using your advice Mike. Thanks so hopefully somehow I'll have the exhaust leak fixed and go from there.

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9 hours ago, banzai510(hainz) said:

Mine all sheared off and I had a guy do mine and a spare manifold in case this happens again im ready to swap it out

I'll have to see if I can locate one or Three in my area to take care of my other cars.

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