2 1/2" ram horn exhaust manifolds? Or something better? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bigeasycigars · 05-27-2010, 04:52 PM

I want to swap out my headers (Hooker Competition) for some 2 1/2" ram horns. (Or is there something better that won't leak?)
Anyone know the best place to order a set?
Once done anyone who wants my old headers can pick them up free of charge.

cleszkie · 05-27-2010, 07:38 PM

Bigeasy -

I switched to 2 1/2-inch ramhorns a while back after giving up on getting my headers to seal. Best mod I ever made. I can get you the Dorman part numbers for the right and left units if you want. Think they were like $90 a piece, but I could be wrong, its been a while. You could try to find an actual GM set, but that could take a while and cost you more.

bigeasycigars · 05-27-2010, 08:23 PM

Love the numbers if you get a chance...I'm so ready for a leakless exhaust.

Quote:

Originally Posted by cleszkie

Bigeasy -

I switched to 2 1/2-inch ramhorns a while back after giving up on getting my headers to seal. Best mod I ever made. I can get you the Dorman part numbers for the right and left units if you want. Think they were like $90 a piece, but I could be wrong, its been a while. You could try to find an actual GM set, but that could take a while and cost you more.

Mike C · 05-27-2010, 08:27 PM

I made the swap 10 years ago and consider it one of the best mods I have made. I also went to Dynomax Hemi turbo mufflers and leave the throaty sound and almost stock noise level at idle. Here is a link to one I found, I used two of these and just bandsawed the alternator mount off and ground the sharp edges.

http://www.autopartswarehouse.com/de...1&apwidWRp8aH1

TonyJohnson · 05-28-2010, 11:26 AM

Dorman 674-504

Get two of these:

Amazon.com: Dorman OE Solutions Exhaust Manifold...
There is also another thread discussing this above this one.

bigeasycigars · 05-28-2010, 03:53 PM

That is 2 of the left hand sides correct? These do not have the heat tubes on them? And you just grind off the alt. mounts? Correct? Thanks for the link BTW.

Quote:

Originally Posted by TonyJohnson

Dorman 674-504

Get two of these: Amazon.com: Dorman OE Solutions Exhaust Manifold 674-504: Automotive

There is also another thread discussing this above this one.

RED72blazer · 05-28-2010, 04:34 PM

Use these remflex exhaust gaskets. i use them on every car I can.

http://catalog.remflex.com/

They will seal your headers up. I've got hooker comps that I put on 8 years ago with these gaskets. I re-tightened them at 500 miles. 8 years later no leaks.

bigeasycigars · 05-28-2010, 06:38 PM

Quote:

Originally Posted by RED72blazer

Use these remflex exhaust gaskets. i use them on every car I can.

http://catalog.remflex.com/

They will seal your headers up. I've got hooker comps that I put on 8 years ago with these gaskets. I re-tightened them at 500 miles. 8 years later no leaks.

what's the part number you used? http://catalog.remflex.com/category_s/94.htm

RED72blazer · 05-28-2010, 06:43 PM

Quote:

Originally Posted by bigeasycigars

what's the part number you used? http://catalog.remflex.com/category_s/94.htm

on the chevy? RF2006...I think. I'd have to check my records. I've also used them for other makes too. The work really well when you have a pitted manifold surface you need to seal.

TonyJohnson · 05-28-2010, 04:41 PM

Quote:

Originally Posted by bigeasycigars

That is 2 of the left hand sides correct? These do not have the heat tubes on them? And you just grind off the alt. mounts? Correct? Thanks for the link BTW.

Correct.

Doug Garland · 05-28-2010, 06:02 PM

Speedway motor has them for $60 each. Part # 930-0327-Side. Specify L or R.

chewiebarker · 09-02-2014, 01:30 PM

Old thread with good info on Rams Horns.

SierraMtns · 12-22-2014, 02:30 AM

Quote:

Originally Posted by chewiebarker

Old thread with good info on Rams Horns.

x2...

**ddc456** · 12-22-2014, 12:53 PM

i have a set locally but im not sure if these part numbers are correct. I would like to put an original set back on my blazer but would these work?

3733976 (LEFT, LH) and 3747038 (RIGHT RH)

Mike C · 12-23-2014, 09:58 AM

Original manifolds were 2 1/4" outlet. The 2 1/2" flow significantly better and look the same for the most part, not sure about your part numbers.

RedRoad · 08-23-2015, 05:54 PM

zombie thread revival.

Bigeasy, which manifolds did you end up going with? Dorman? How do you like them after all this time?

Thanks

colgad · 08-23-2015, 06:44 PM

There is always these:
http://www.ebay.com/itm/Small-Block-...-/331304286719
Small Block Chevy Heavy Duty Cast Iron Exhaust Manifolds

beanious · 03-29-2018, 10:04 PM

Hello all, I recently upgraded to speedway stainless ramhorn exhaust manifolds. I used the included head to manifold gaskets, cleaned, torqued and re-torqued 4 times after warmups. Of course the gaskets blew out, so I'm installing new ones.

After the recommendations from this posting's subscribers, I looked up the Remflex gaskets. On SummitRacing they had (22) 5-Star reviews and (1) 4-Star review, that is an amazing success rate! I ordered a set and am awaiting their arrival. After installation and break-in I'll post the results.

Thanks all.

**mattfranklin** · 02-25-2021, 08:15 PM

Zombie alert. I really like this thread. Are there any prebent intermediate pipes that bolt up to the 2 1/2" ram horns? I'm planning on using two right hand Dorman manifolds so I get the nice bevel to fit the doughnut.

05-27-2010, 04:52 PM	#1
bigeasycigars Registered User Join Date: Mar 2010 Location: Los Angeles, California Posts: 226	2 1/2" ram horn exhaust manifolds? Or something better? I want to swap out my headers (Hooker Competition) for some 2 1/2" ram horns. (Or is there something better that won't leak?) Anyone know the best place to order a set? Once done anyone who wants my old headers can pick them up free of charge.

05-27-2010, 07:38 PM	#2
cleszkie Registered User Join Date: Feb 2003 Location: Santa Ana, CA Posts: 2,191	Re: 2 1/2" ram horn exhaust manifolds? Or something better? Bigeasy - I switched to 2 1/2-inch ramhorns a while back after giving up on getting my headers to seal. Best mod I ever made. I can get you the Dorman part numbers for the right and left units if you want. Think they were like $90 a piece, but I could be wrong, its been a while. You could try to find an actual GM set, but that could take a while and cost you more.

05-27-2010, 08:27 PM	#4
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,728	Re: 2 1/2" ram horn exhaust manifolds? Or something better? I made the swap 10 years ago and consider it one of the best mods I have made. I also went to Dynomax Hemi turbo mufflers and leave the throaty sound and almost stock noise level at idle. Here is a link to one I found, I used two of these and just bandsawed the alternator mount off and ground the sharp edges. http://www.autopartswarehouse.com/de...1&apwidWRp8aH1 __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

05-28-2010, 11:26 AM	#5
TonyJohnson Registered User Join Date: Mar 2003 Location: Cheboygan, MI Posts: 998	Re: 2 1/2" ram horn exhaust manifolds? Or something better? Dorman 674-504 Get two of these: Amazon.com: Dorman OE Solutions Exhaust Manifold... There is also another thread discussing this above this one. __________________ Tony Johnson -- '71 Blazer w/L-31 Vortec 350, SM465, NP205, performer intake, edelbrock 1406, HEI, 4" lift, Boyd EFI tank, Vintage A/C My Blazer --

05-28-2010, 04:34 PM	#7
RED72blazer urban fourwheelin Join Date: Aug 2002 Location: Seattle Posts: 1,007	Re: 2 1/2" ram horn exhaust manifolds? Or something better? Use these remflex exhaust gaskets. i use them on every car I can. http://catalog.remflex.com/ They will seal your headers up. I've got hooker comps that I put on 8 years ago with these gaskets. I re-tightened them at 500 miles. 8 years later no leaks. __________________ 1972 K5 Blazer with Cummins 4BT, NV4500 swap in the parts gathering stage. Last edited by RED72blazer; 05-28-2010 at 04:35 PM.

05-28-2010, 06:02 PM	#11
Doug Garland Registered User Join Date: May 2010 Location: Talking Rock, Ga. Posts: 22	Re: 2 1/2" ram horn exhaust manifolds? Or something better? Speedway motor has them for $60 each. Part # 930-0327-Side. Specify L or R.

09-02-2014, 01:30 PM	#12
chewiebarker Registered User Join Date: Feb 2014 Location: Boxford, MA Posts: 364	Re: 2 1/2" ram horn exhaust manifolds? Or something better? Old thread with good info on Rams Horns. __________________ 1971 K20 Suburban 2012 LS1500 4WD Suburban 2003 Honda Accord LX V6 (don't tell anyone) MY 'BUILD' THREAD: http://67-72chevytrucks.com/vboard/s...d.php?t=618915

12-22-2014, 12:53 PM	#14
ddc456 Active Member Join Date: Jan 2014 Location: Bend Oregon Posts: 163	Re: 2 1/2" ram horn exhaust manifolds? Or something better? i have a set locally but im not sure if these part numbers are correct. I would like to put an original set back on my blazer but would these work? 3733976 (LEFT, LH) and 3747038 (RIGHT RH)

12-23-2014, 09:58 AM	#15
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,728	Re: 2 1/2" ram horn exhaust manifolds? Or something better? Original manifolds were 2 1/4" outlet. The 2 1/2" flow significantly better and look the same for the most part, not sure about your part numbers. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

08-23-2015, 05:54 PM	#16
RedRoad Registered User Join Date: Jan 2015 Location: Los Angeles California Posts: 928	Re: 2 1/2" ram horn exhaust manifolds? Or something better? zombie thread revival. Bigeasy, which manifolds did you end up going with? Dorman? How do you like them after all this time? Thanks

08-23-2015, 06:44 PM	#17
colgad Registered User Join Date: Jun 2006 Location: Lutz, Florida Posts: 838	Re: 2 1/2" ram horn exhaust manifolds? Or something better? There is always these: http://www.ebay.com/itm/Small-Block-...-/331304286719 Small Block Chevy Heavy Duty Cast Iron Exhaust Manifolds Attached Images __________________ 1967 Red, C10 Short Bed 6.0L T5 5 speed 1967 Orange and Black C50 6.2 Detroit Diesel NV4500, 2 Ton Pickup 1972 White, Chevy Blazer 2WD 67 Dog house 5.3 4L65 2016 Power Tour LH 1955 Red-Cream, Chevrolet Nomad, restoration on hold 2004 Black, Corvette Z06 LS6 convertible (Rock solid Fun) 2011/2018 Power Tour Last edited by colgad; 08-23-2015 at 06:46 PM. Reason: additional text

03-29-2018, 10:04 PM	#18
beanious Registered User Join Date: Apr 2008 Location: Sacramento, CA Posts: 201	Best Exhaust Manifold Gaskets... Hello all, I recently upgraded to speedway stainless ramhorn exhaust manifolds. I used the included head to manifold gaskets, cleaned, torqued and re-torqued 4 times after warmups. Of course the gaskets blew out, so I'm installing new ones. After the recommendations from this posting's subscribers, I looked up the Remflex gaskets. On SummitRacing they had (22) 5-Star reviews and (1) 4-Star review, that is an amazing success rate! I ordered a set and am awaiting their arrival. After installation and break-in I'll post the results. Thanks all.

02-25-2021, 08:15 PM	#19
mattfranklin Senior Member Join Date: Dec 2011 Location: Moraga, CA Posts: 812	Re: 2 1/2" ram horn exhaust manifolds? Or something better? Zombie alert. I really like this thread. Are there any prebent intermediate pipes that bolt up to the 2 1/2" ram horns? I'm planning on using two right hand Dorman manifolds so I get the nice bevel to fit the doughnut. __________________ (Very) Slow-Going Build Thread: Stock 1970 Short Step with Stock 1970 LT-1 http://67-72chevytrucks.com/vboard/s...d.php?t=567340



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