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Old 09-09-2005, 05:57 PM   #1 (permalink)
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ram horn manifolds

I have an 89 350 Chevy engine which will be transplanted into an 83 Landcruiser.

I am looking at using some Ramhorn manifolds...what year model ramhorns will fit the 89? a friend has a 1970 chevy truck with these type manifolds and they seem like a possible fit..

Thanks in advance for the help...

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Old 09-09-2005, 06:48 PM   #2 (permalink)
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Mine fit my 91 Vette heads just fine. I did grind slightly for the raised exhuast port though.
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Old 09-09-2005, 08:46 PM   #3 (permalink)
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Watch what side you get ahold of if you are collecting them in salvage yards, as the early 62-68or9 impala's were bad to dump the collector straight down... I had a set on a 307 from a 68 chevelle and they dumped down then turned toward the rear so to clear the cross member of the front K frame in my 65 GMC 2wd 1 ton.. I work for a salvage yard devoted to parting out old GM muscle Cars, known as Sundell Auto Specialties in Shelby NC... Most of the Ram Horns that I have come across fall into two catagories.... one is for cars w/ the exception of the Corvette, they ran a bigger flow and a better casting, but usually dumped straight down (seen very few of these and they are super expensive) and two was the cars and older trucks. the cars w/ the exception of the impala normally dumped to the rear as to clear the K frames in the suspension, this was generally true for the trucks as well... you can also look into a set of 68-72 stock exhaust manifolds which run just below the exhaust ports and dump at a downward angle at the rear of the block. that is if your frame clearances will tolorate.... when I did my truck I wanted to run shorty headers which are as close as the Rams horn and dump at about the same place as the rams but dont carry the choked flow of the rams....However cost was the prevailing restriction, as shortys are quite expensive.
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Old 09-09-2005, 09:06 PM   #4 (permalink)
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I had a pair on my '91 crewcab - the straight down ones. I had to trim the driver's engine mount bracket slightly (see red circle). The angled-back ones apparently don't need any trimming. Also has to grind the manifold a little so they don't touch the center-bolt valves covers... no biggy (it's a excess casting lump anyways).
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Old 09-10-2005, 09:42 AM   #5 (permalink)
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I just bought a new one to go with my turbo manifold
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Old 09-10-2005, 10:09 AM   #6 (permalink)
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Be careful w/Vortec heads, though. The middle plugs are a little closer together, and it will cause the boots to burn thru. My friend did this and ended up getting some plug wires with ceramic boots, after spending lots of $ replacing and trying to insulate in vain. I used center dump headers, same issue w/the vortec heads. I ended up very carefully clearancing the tubes.
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Old 09-10-2005, 01:51 PM   #7 (permalink)
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Originally Posted by mountain4x4
Be careful w/Vortec heads, though. The middle plugs are a little closer together, and it will cause the boots to burn thru. My friend did this and ended up getting some plug wires with ceramic boots, after spending lots of $ replacing and trying to insulate in vain. I used center dump headers, same issue w/the vortec heads. I ended up very carefully clearancing the tubes.

No problems with the 2 1/2" Corvette ram's horns on my Vortec heads. I am using the stock sheet metal heat shields that are designed to be used with the ram's horns though.
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Old 09-10-2005, 03:14 PM   #8 (permalink)
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I am using the stock sheet metal heat shields that are designed to be used with the ram's horns though.
I bet that would have helped if he would have known to use them...
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Old 09-10-2005, 10:30 PM   #9 (permalink)
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I've got vortec heads (99 suburban motor in my jeep) and I toasted my first set of plug wires on the 5 and 6 cylinder with my 2.5" center dump horns. I ended up using Taylor metal boot shields and their soft wire covers and it solved the problem. I believe they were mid 60's vette. They no longer make them. GM has discontinued in the past year unfortunately. The manifolds I removed from the motor were a nice cast rear dump from the 99 suburban and if I didn't have to clear a clutch slave would have worked nicely. They might work if your cruisers an auto.

Edit: I did end up burning through the same plug wires but it just took longer. Since I'm editing there is an aftermarket source for the 2.5" collector ram horns part# 3797901. I recently posted what I think is a new solution for these manifolds with vortec heads. I ended up using big block plug wires and big block heat sleeves. Part numbers are on my website http://www.14kft.com/Pg%20JeepMenu.htm
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Old 09-10-2005, 11:39 PM   #10 (permalink)
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chev might not make them, but every aftermarket source does

ps- use vette plug wires, they are long enough to route properly (much longer then a universal kit btdt)
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Old 09-11-2005, 07:21 AM   #11 (permalink)
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Plug wires for an '83 Cutlass w/305 are long enough too. That is what I bought for a 283 w/ HEI and rams in a '57 Suburban.
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Old 04-27-2008, 08:28 PM   #12 (permalink)
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i apologise for bumpin this old thread, but my shitty search led me to this one that had closest to what i needed for an answer, yet still didnt.

i have a '94 or '97 5.7 350 (it came out of a '97 suburban, but a '97 oil pump would not fit, it took one from a '94). will some ram horns from a mid 60's (62-68) fit? more specifically, these: http://www.1aauto.com/1A/ExhaustMani...EK00035/522774

this is for a '76 fj40, btw
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Old 04-27-2008, 09:05 PM   #13 (permalink)
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Did you not read the thread at all?
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Old 05-01-2008, 11:26 PM   #14 (permalink)
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Originally Posted by morgsie View Post
Did you not read the thread at all?
Nope.
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Old 05-02-2008, 12:59 AM   #15 (permalink)
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Well, ya might want to then....

FWIW, they fit just fine on my 78 chevy. Will have to get pics when I get back home next month.
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Old 05-02-2008, 07:40 PM   #16 (permalink)
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We have 4 of them on the shelf at work. They were only $70 each brand new from Dorman, but I don't know the part number off the top of my head. Anyway...check your better local auto parts store. I'll get you the Dorman number if they can't find it.
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Old 05-02-2008, 08:18 PM   #17 (permalink)
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Well, ya might want to then....

FWIW, they fit just fine on my 78 chevy. Will have to get pics when I get back home next month.
I should clarify - Nope - he didn't read it. I've read it twice now
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Old 05-02-2008, 08:40 PM   #18 (permalink)
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IMO the only rams horns worth getting are the Corvette ones with the 2.5 in. outlets. As a side note the guy who said he got a pair off of a 68 Chevelle must have mixed up a Chevelle with something else. I own 4 of em from 68 to 72 and none of them have rams horns. They all run below the plugs like the chevy truck manifolds. The truck manifolds on my 76 have pretty big outlets on them too.
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Old 05-03-2008, 08:05 AM   #19 (permalink)
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The 4x4 67-72 Chevy trucks had center dump manifolds. Some of the 2x4's have a center dump on one side and an angled dump on the other.

I ditched mine for some Heddman headers in the late 80's (which was the only thing I could find that worked with stock clutch linkage), then in the late 90's when the collector flanges had rotted off I put the 'vette 2 1/2" manifolds on it. IME, with the Crane 266 cM, Weiand 8004 intake and Q-jet, I picked up some low end torque and didn't hurt it on the top either. Not a completely fair comparison, because I swapped from 2 1/4" duals with turbo mufflers to 2 1/2" duals with longer Walker Hemi turbo mufflers (which rock).

The 'vette plug wires route from the distributor down the back of the block and run along the oil pan rails to come up to the plugs. I buy the Taylor pre-made wires for a '73 for a regular distributor and '75 for HEI. I used aftermarket valve cover wire clamps bolted to the pan rail to hold them in place.
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Old 05-03-2008, 01:56 PM   #20 (permalink)
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The 4x4 67-72 Chevy trucks had center dump manifolds. Some of the 2x4's have a center dump on one side and an angled dump on the other.
I'm borrowing a buddies '67 GMC C20, and it has centre dump on the drivers and angled dump on the passengers I believe. I may have it backwards however...
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