Size of stock ram horn manifolds? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1972SUPERSB · 04-10-2013, 10:13 AM

I am wondering what the size is of the stock ram horn manifold? I am thinking 2"? Is this correct? I want to run 2 1/2 exhaust and have the stock ram horn manifold. Will the 2 1/2 exhaust fit in these or will the pipe need to be increased when it comes out of the manifold to the new 2 1/2 exhaust? Thanks
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JimKshortstep4x4 · 04-10-2013, 11:05 AM

2" is the stock size. You will have to have an adapter to go from 2" to 2 1/2".

Ramhorns with 2 1/2" outlets are available.

Jim

1972SUPERSB · 04-10-2013, 11:36 AM

Quote:

Originally Posted by JimKshortstep4x4

2" is the stock size. You will have to have an adapter to go from 2" to 2 1/2".

Ramhorns with 2 1/2" outlets are available.

Jim

Do they make the 2 1/2 ram horns with the angle outlet or just the straight down outlet?
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MARKDTN · 04-10-2013, 04:25 PM

Only straight down. This was used on the 64 HiPo Corvettes. Even the later Corvettes used a 2" outlet and adapted up to 2 1/2" on the later ones that had the optional bigger pipes.

Another option for 2 1/2" straight down is 84-91 Corvette is a tubular shorty header and the 92-96 Corvette LT1 has a 2 1/2" outlet center dump cast manifold. If you buy LT1 ones, be sure to remove the cover before buying. They are prone to crack under the cover.

04-10-2013, 10:13 AM	#1
1972SUPERSB Registered User Join Date: Sep 2012 Location: San Antonio, TX Posts: 1,026	Size of stock ram horn manifolds? I am wondering what the size is of the stock ram horn manifold? I am thinking 2"? Is this correct? I want to run 2 1/2 exhaust and have the stock ram horn manifold. Will the 2 1/2 exhaust fit in these or will the pipe need to be increased when it comes out of the manifold to the new 2 1/2 exhaust? Thanks Posted via Mobile Device __________________ Jeff 1972 Cheyenne Super SWB 350, Auto, Bucket Seats w/Console, Tach, Factory A/C, P/S ,P/B, Tilt 1998 Chevy 1500 Ext Cab 5.7, Pewter w/blue interior

04-10-2013, 11:05 AM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: Size of stock ram horn manifolds? 2" is the stock size. You will have to have an adapter to go from 2" to 2 1/2". Ramhorns with 2 1/2" outlets are available. Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

04-10-2013, 04:25 PM	#4
MARKDTN Registered User Join Date: Jan 2011 Location: Chattanooga, TN Posts: 2,144	Re: Size of stock ram horn manifolds? Only straight down. This was used on the 64 HiPo Corvettes. Even the later Corvettes used a 2" outlet and adapted up to 2 1/2" on the later ones that had the optional bigger pipes. Another option for 2 1/2" straight down is 84-91 Corvette is a tubular shorty header and the 92-96 Corvette LT1 has a 2 1/2" outlet center dump cast manifold. If you buy LT1 ones, be sure to remove the cover before buying. They are prone to crack under the cover. __________________ '83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project



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