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Exhaust Thread


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#101 KamakSun

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Posted 07 August 2016 - 06:43 AM

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

 

 

 

 

 



#102 datzenmike

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Posted 07 August 2016 - 11:07 AM

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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#103 Stoffregen Motorsports

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Posted 07 August 2016 - 11:33 AM

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.



#104 datzenmike

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Posted 07 August 2016 - 01:40 PM

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

 

standardand4intotwoexhaust001.jpg


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#105 BrandonS

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Posted 25 September 2017 - 05:05 AM

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



#106 racerx

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Posted 25 September 2017 - 05:19 AM

Nice sound also like the color of your car.

#107 datzenmike

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Posted 25 September 2017 - 05:31 AM

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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