Ram horns I.D. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Gene · 08-21-2011, 04:22 PM

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!

vectorit · 08-21-2011, 04:36 PM

The passenger side is flush, because there is a thermostatic flapper valve that goes on first then the doughnut gasket to pipe.

Ackattack · 08-21-2011, 04:39 PM

Quote:

Originally Posted by vectorit

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.

vectorit · 08-21-2011, 04:51 PM

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...

Gene · 08-21-2011, 07:10 PM

Ok. tried to install these manifolds and the drivers side has a threaded bracket that hits my alternator bracket? Should I switch sides?

vectorit · 08-21-2011, 07:52 PM

The earlier style had the alternator mounted to the exhaust manifold on the driver side.

Gene · 08-21-2011, 09:39 PM

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

Gene · 08-22-2011, 03:47 PM

Quote:

Originally Posted by vectorit

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.

stsalvage · 08-22-2011, 09:21 PM

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

stsalvage · 08-22-2011, 09:25 PM

More photos

08-21-2011, 04:22 PM	#1
Gene Registered User Join Date: Aug 2002 Location: Muskogee, Oklahoma Posts: 2,914	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! __________________ 1971 SWB 4X4 Build BOARD MEMBER #5448 BOOMER SOONER!!!! Last edited by Gene; 08-21-2011 at 04:30 PM.

08-21-2011, 04:36 PM	#2
vectorit What? Join Date: Jun 2007 Location: Southern California Posts: 7,617	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. __________________ Chris 1968 K20 Suburban 1972 K10 LWB PU

08-21-2011, 04:51 PM	#4
vectorit What? Join Date: Jun 2007 Location: Southern California Posts: 7,617	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... __________________ Chris 1968 K20 Suburban 1972 K10 LWB PU

08-21-2011, 07:10 PM	#5
Gene Registered User Join Date: Aug 2002 Location: Muskogee, Oklahoma Posts: 2,914	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? __________________ 1971 SWB 4X4 Build BOARD MEMBER #5448 BOOMER SOONER!!!!

08-21-2011, 07:52 PM	#6
vectorit What? Join Date: Jun 2007 Location: Southern California Posts: 7,617	Re: Ram horns I.D. The earlier style had the alternator mounted to the exhaust manifold on the driver side. Attached Images __________________ Chris 1968 K20 Suburban 1972 K10 LWB PU

08-21-2011, 09:39 PM	#7
Gene Registered User Join Date: Aug 2002 Location: Muskogee, Oklahoma Posts: 2,914	Re: Ram horns I.D. Cool thanks. I'll have to mount mine like that then. __________________ 1971 SWB 4X4 Build BOARD MEMBER #5448 BOOMER SOONER!!!!

08-22-2011, 09:21 PM	#9
stsalvage Scrapper 1 Join Date: Jan 2007 Location: Riverside Calif Posts: 1,649	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 Attached Images

08-22-2011, 09:25 PM	#10
stsalvage Scrapper 1 Join Date: Jan 2007 Location: Riverside Calif Posts: 1,649	Re: Ram horns I.D. More photos Attached Images



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