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

Sport/Truck · 05-01-2007, 10:24 PM

After reading here about how good ram horn exhaust manifolds are, I recently read about someone saying they had 2.5 in ram horns. So I measured mine and they are only 2in.
Are these going to be adequate for my new 383?? These are the original ones that came with the truck & have an angled outlet (which I like) but most of the ones I see talked about are strait down.
Are the Corvette manifolds the 2.5 dia with the straight down outlet? Is it worth trying to get a set and selling mine? Or it’s not that big of a deal?
s/t

cdowns · 05-01-2007, 10:46 PM

21/2 flow ALOT more and better than 2inch / you cant make power if you dont flow air plain and simple// you camn get brand new in either castiron or stainless from speedway motors

Sport/Truck · 05-01-2007, 10:58 PM

Quote:

Originally Posted by cdowns

21/2 flow ALOT more and better than 2inch / you cant make power if you dont flow air plain and simple// you camn get brand new in either castiron or stainless from speedway motors

Thanks for the info, do you have a link? What did they come on orginaly?
s/t

gator2511 · 05-01-2007, 11:39 PM

They came on the 63-65 fuelie vettes. The corvette parts people want a fortune for them but you can get them if you look around. My 64 vette had them but I sold one of them to a guy needing a fuelie manifold. Now I wish I had kept it. I found Speedway by just typing it in my browser. They may have come on some other cars but I know they came on the vettes.

**Stocker** · 05-01-2007, 11:44 PM

Quote:

Originally Posted by Sport/Truck

What did they come on orginaly?

I had a couple old Corvettes with those manifolds -- a '65 327/365 and a '66 327/350. Like an idiot, when I put Hooker headers on the '65, I scrapped the stock manifolds! That was in 1968... wish I had them now.

Dang, my slow typing got me beat out again!

**70C10Toejam** · 05-01-2007, 11:47 PM

I read in a mag. that the ram horns were about 60-70% as good as headers over regular log-type manifolds. does your experience hold true to this????

**special-K** · 05-02-2007, 06:35 AM

Will center dump Vette ramshorns work on a 2wd?

gator2511 · 05-02-2007, 08:29 AM

Quote:

Originally Posted by special-K

Will center dump Vette ramshorns work on a 2wd?

PICKMUP has info and photos of this in the 67-72 pickup parts section.

Sport/Truck · 05-02-2007, 10:50 PM

Quote:

Originally Posted by 70C10Toejam

I read in a mag. that the ram horns were about 60-70% as good as headers over regular log-type manifolds. does your experience hold true to this????

This is what I heard, but nobody mentioned 2.5 dia in any of those statements. Not sure if it only applies to the 2.5’s or 2in. But I would agree that the bigger would flow better.
s/t

gator2511 · 05-05-2007, 06:56 PM

I found the manifold casting numbers on the 2 1/2" Rams Horn Manifolds. What you should be looking for is:

3797901 = Left side.

3797902 = Right side.

3797942 = Left side with fuel injection.

These are the straight exhaust drop downs. I found some for sale at good prices on the net but I went with a new reproduction one from 1AAuto.com. These are new and you don't have to deal with broken studs and cracked bolt surfaces. They seem like real nice folks and they shipped the next day. $75 plus $19 shipping. Just type in 1963 corvette and it will take you to them. Look for the 2 1/2" ones. I should get it Wednesday and I'll give you my impression of the quality if anyone is interested.

Sport/Truck · 05-05-2007, 08:20 PM

Thanks, I’m interested. Please keep me posted.
Dean

05-01-2007, 10:24 PM	#1
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Ram horns questions. After reading here about how good ram horn exhaust manifolds are, I recently read about someone saying they had 2.5 in ram horns. So I measured mine and they are only 2in. Are these going to be adequate for my new 383?? These are the original ones that came with the truck & have an angled outlet (which I like) but most of the ones I see talked about are strait down. Are the Corvette manifolds the 2.5 dia with the straight down outlet? Is it worth trying to get a set and selling mine? Or it’s not that big of a deal? s/t __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.

05-01-2007, 10:46 PM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Ram horns questions. 21/2 flow ALOT more and better than 2inch / you cant make power if you dont flow air plain and simple// you camn get brand new in either castiron or stainless from speedway motors __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

05-01-2007, 11:39 PM	#4
gator2511 Registered User Join Date: Mar 2005 Location: tampa florida Posts: 776	Re: Ram horns questions. They came on the 63-65 fuelie vettes. The corvette parts people want a fortune for them but you can get them if you look around. My 64 vette had them but I sold one of them to a guy needing a fuelie manifold. Now I wish I had kept it. I found Speedway by just typing it in my browser. They may have come on some other cars but I know they came on the vettes.

05-01-2007, 11:47 PM	#6
70C10Toejam Hellasick Join Date: Jul 2006 Location: Death Moans, IA Posts: 876	Re: Ram horns questions. I read in a mag. that the ram horns were about 60-70% as good as headers over regular log-type manifolds. does your experience hold true to this???? __________________ I keep two MAGNUMS in my desk. One's a gun, and I keep it loaded. The other's a bottle and it keeps ME loaded. I'm Tracer Bullet. (Calvin and Hobbes) This life was a test. It was only a test. If this had been an actual life, you would have received instructions on where to go and what to do. RED meat is not bad for you...FUZZY BLUE/GREEN MEAT is bad for you!!!!!!!!!!!!! BUILT FORD TOUGH WITH CHEVY STUFF--sticker at Goodguys

05-02-2007, 06:35 AM	#7
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Ram horns questions. Will center dump Vette ramshorns work on a 2wd? __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

05-05-2007, 06:56 PM	#10
gator2511 Registered User Join Date: Mar 2005 Location: tampa florida Posts: 776	Re: Ram horns questions. I found the manifold casting numbers on the 2 1/2" Rams Horn Manifolds. What you should be looking for is: 3797901 = Left side. 3797902 = Right side. 3797942 = Left side with fuel injection. These are the straight exhaust drop downs. I found some for sale at good prices on the net but I went with a new reproduction one from 1AAuto.com. These are new and you don't have to deal with broken studs and cracked bolt surfaces. They seem like real nice folks and they shipped the next day. $75 plus $19 shipping. Just type in 1963 corvette and it will take you to them. Look for the 2 1/2" ones. I should get it Wednesday and I'll give you my impression of the quality if anyone is interested. Last edited by gator2511; 05-05-2007 at 07:06 PM.

05-05-2007, 08:20 PM	#11
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: Ram horns questions. Thanks, I’m interested. Please keep me posted. Dean __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.

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