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#1 |
Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
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bolt torque for ram horns.
I've tried searching everything and came up empty.
Anyone have the torque specs for ram horns manifolds? 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. ![]() |
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#2 |
Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
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Re: bolt torque for ram horns.
I found it. one says 20 ft lb. and two others say 25 ft. lb. Both say with anti seize.
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. ![]() |
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#3 |
Registered User
Join Date: May 2008
Location: Alta Loma, Ca.
Posts: 930
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Re: bolt torque for ram horns.
Yea, I usually do 30 ft lbs or as tight as I can get them with one hand on a 9/16 long handle wrench. These are 3/8 bolts same as the intake and even though the intake only calls for 20 to 25 ft lbs I will usually go 27 to 30 because I hate intake leaks!
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#4 |
Old Skool Club
![]() Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
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Re: bolt torque for ram horns.
Make sure they're not warped.....it may be that they won't but then this note wouldn't matter.
I have three sets of ram's horn exhaust manifolds that I need to identify. Any websites that anyone knows of right off the top of your head?
__________________
Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. |
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#5 |
blood type; Retumbo
Join Date: Jan 2004
Location: next to my reloading bench
Posts: 10,269
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Re: bolt torque for ram horns.
I would go for 20 ft.lbs. the manifolds grow as they heat up. if the bolts are too tight they will break and then the manifolds will be ruined from a major leak.
also, do NOT use any gasket. at the most a light film of ultra copper RTV sealant. |
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#6 | |
Registered User
Join Date: May 2007
Location: Buffalo MN
Posts: 606
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Re: bolt torque for ram horns.
Quote:
nate
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Trial and Error, its expensive but its a mistake i most likely wont make again 1971 chevy k10 custom deluxe http://67-72chevytrucks.com/vboard/s...d.php?t=341257 1968 chevy k/10 fleet http://67-72chevytrucks.com/vboard/s...d.php?t=334731 1948 desoto custom coupe fluid drive(family heirloom) |
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#7 | |
Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
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Re: bolt torque for ram horns.
Quote:
seal with - along as it's not warped like ChevLoRay said. 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. ![]() |
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#8 | |
Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
|
Re: bolt torque for ram horns.
Quote:
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. ![]() |
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#9 |
Middle-aged Curmudgeon
Join Date: Jun 2008
Location: Independence, MO
Posts: 753
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Re: bolt torque for ram horns.
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#10 | |
Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
|
Re: bolt torque for ram horns.
Quote:
These are very flat with no indication of warpage. 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. ![]() |
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#11 |
blood type; Retumbo
Join Date: Jan 2004
Location: next to my reloading bench
Posts: 10,269
|
Re: bolt torque for ram horns.
unless you use the 2 layered stainless steel ones from GM they will blow out.
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#12 |
Senior Member
![]() Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,234
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Re: bolt torque for ram horns.
umm i used gaskets with mine and have had no problems
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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#13 |
Senior Member
![]() Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,873
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Re: bolt torque for ram horns.
Just for the record,the factory torque specs for the ram-horn exhaust manis is; 20 ft.lbs. for the outside bolts and 30 for the inside bolts.
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. Last edited by WorkinLonghorn; 10-01-2008 at 08:47 AM. |
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#14 | |
Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
|
Re: bolt torque for ram horns.
Quote:
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. ![]() |
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#15 |
Senior Member
![]() Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,873
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Re: bolt torque for ram horns.
I guess so. I do think that those specs are important though,just due to the heat involved. I over torqued mine before I got the specs and later I noticed a crack,and had to replace the mani. 5lbs over/under may be safe.
__________________
'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. |
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#16 |
Registered User
Join Date: May 2008
Location: Alta Loma, Ca.
Posts: 930
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Re: bolt torque for ram horns.
It won't hurt. If they don't leak don't sweat it. Just as an aside the intake manifold bolts torque to 35 ft. lbs. Even if the manifolds swell with heat the bolts will stretch a little too. I just drilled out the center holes in my sons 93 because they are almost impossible to get all the bolts in without extra movement. Funny the outers are 1/2 holes but the inners are 7/16, I drilled the inners to 1/2 also. I guess that is why a lot of 88 and up trucks crack exhaust manifolds.
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#17 | |
Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
|
Re: bolt torque for ram horns.
Quote:
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. ![]() |
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#18 |
blood type; Retumbo
Join Date: Jan 2004
Location: next to my reloading bench
Posts: 10,269
|
Re: bolt torque for ram horns.
the center holes are smaller because that is what locates the manifold. the outter holes are bigger to allow the manifold to grow lengthwise.
as far as the theory of the bolts and manifold both growing. they are made of different metals. the cast iron expands more under heat than steel. |
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#19 |
Active Member
![]() Join Date: Dec 2003
Location: Waterbury, CT
Posts: 591
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Re: bolt torque for ram horns.
The outer ports of the exhaust manifold have locking plates on them. After you install and torque the bolts you bend over the tabs on the locking plates to secure the bolts. I don't see any one mentioning them.
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