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Old 08-21-2011, 04:22 PM   #1
Gene
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Ram horns I.D.

Can anyone identify wether or not I have a pair of matching ram horns? Part numbers are GM 3846559 LH22 and GM 3747038 RH21. I enter these numbers in google and it sends me to corvette sites. Also, why is one tapered where the donut gasket goes and the other is not? Thanks!



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Old 08-21-2011, 04:36 PM   #2
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Re: Ram horns I.D.

The passenger side is flush, because there is a thermostatic flapper valve that goes on first then the doughnut gasket to pipe.
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Old 08-21-2011, 04:39 PM   #3
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Re: Ram horns I.D.

Quote:
Originally Posted by vectorit View Post
The passenger side is flush, because there is a thermostatic flapper valve that goes on first then the doughnut gasket to pipe.
This just dawned on me: if you remove that flapper valve, and just use a donut gasket, will you have a horrible exhaust leak. I removed the flapper valve when I put my new exhaust on, and its pretty loud.
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Old 08-21-2011, 04:51 PM   #4
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Re: Ram horns I.D.

I suppose one could remove the valve, but then have to chamfer the the inside so that the doughnut gasket could get a proper seal.

In the past, I would just take an old valve and knock out the butterfly. Since a lot of the times the valve gets frozen into position anyways.

Those valves cost about 65 bones too...
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Old 08-22-2011, 03:47 PM   #5
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Re: Ram horns I.D.

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Originally Posted by vectorit View Post
I suppose one could remove the valve, but then have to chamfer the the inside so that the doughnut gasket could get a proper seal.

In the past, I would just take an old valve and knock out the butterfly. Since a lot of the times the valve gets frozen into position anyways.

Those valves cost about 65 bones too...
Wow, does anyone know if I can buy just a chamfered spacer to take the place of this valve? I hate to try and modify this manifold.
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Old 08-22-2011, 09:21 PM   #6
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Re: Ram horns I.D.

I'v seen that Bracket on the 1967--70 trucks But on my 1964--72 We have a Bracket that are plentiful on Ebay and most all parts catalogs that where really simple to use But the 1968--72 trucks went away from the exhaust mounted alternator
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Old 08-21-2011, 07:10 PM   #7
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Re: Ram horns I.D.

Ok. tried to install these manifolds and the drivers side has a threaded bracket that hits my alternator bracket? Should I switch sides?
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Old 08-21-2011, 07:52 PM   #8
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Re: Ram horns I.D.

The earlier style had the alternator mounted to the exhaust manifold on the driver side.
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Old 08-21-2011, 09:39 PM   #9
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Re: Ram horns I.D.

Cool thanks. I'll have to mount mine like that then.
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