LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Vibration w/ LT Headers

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Old Jun 26, 2006 | 11:25 AM
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Default Vibration w/ LT Headers

well i got some pretty good vibration coming from my driver side header. it only happens at generally low rpm's when you gas on it just a little more than normal. i mean if you slightly press the gas just enough to go, then it wont vibrate, but anymore than that you get some vibration. and i looked under the hood and couldnt really see what it was touching. i just saw it was really really close to the steering column. so i was wondering if anyone else has experienced this before with Long Tubes. thanks a lot. Dan
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Old Jun 26, 2006 | 02:14 PM
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Most likely its your bolts.....tighten them up and after 50miles its gonna losen again so you need new bolts...i had the same problem.....and btw is there a ticking sound???
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Old Jun 26, 2006 | 11:18 PM
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or your motor mounts are old/saggy causing your LT's to rub/vibrate on your k-member/chasis
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Old Jun 27, 2006 | 03:59 AM
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Originally Posted by FIREHAWK #07
or your motor mounts are old/saggy causing your LT's to rub/vibrate on your k-member/chasis
99 percent guarantee on this is the cause... I had the same prob I went to some new motor mounts and it fixed it right up
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Old Jun 27, 2006 | 07:33 AM
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wow. thats some good info.
mumu_624-yes there is a ticking noise. what is it. and ill see if i can tighten the bolts. is there a certain torque i need to tighten them to or do i just get them as tight as i can? thanks man

and for the other 2. where could i get some new motor mounts at and how much do you think it would cost for me to get them installed. and thanks for the helpful info.
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Old Jun 27, 2006 | 10:44 AM
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Originally Posted by badazz99ta
wow. thats some good info.
mumu_624-yes there is a ticking noise. what is it. and ill see if i can tighten the bolts. is there a certain torque i need to tighten them to or do i just get them as tight as i can? thanks man

umm i kept on Tighten them but they kept on getting Lose but your best bet is tighten them and them go to Auto zone or Advance and get you some Header Bolts and replace them....
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Old Jun 27, 2006 | 06:20 PM
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thunder racing.... install them yourself and save $$$

part # 47-7-508 at http://thunderracing.com/catalog/?ac...&vid=4&pcid=92
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Old Jun 27, 2006 | 11:23 PM
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my 96 t-a is doing the same thing could be two things 1 need to add some extra bracing on your driver side y-pipe under your seat area a section of the unibody is getting hit by it 2 motor mounts my be worn allowing the motor to pickup under throttle and pick up the header and hitting the underbody
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Old Jun 28, 2006 | 01:35 PM
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change the motor mounts...
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Old Jul 6, 2006 | 08:39 AM
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well i finally got up under my hood to check out the header bolts. and i have no rear driver side header bolts. so the 2 in the very back arent even there. now i have to find out if they broke off or if they were never there. hopefully when i get those in there some of the problems will be fixed. do yall have any suggestions on this matter. thanks a lot.
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Old Jul 6, 2006 | 10:13 AM
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Originally Posted by mumu_624
Most likely its your bolts.....tighten them up and after 50miles its gonna losen again so you need new bolts...i had the same problem.....and btw is there a ticking sound???
Why would you need need new bolts?
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Old Jul 6, 2006 | 10:39 AM
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Originally Posted by NoMoreLS1
Why would you need need new bolts?
The Bolts could be bad!!!!
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Old Jul 6, 2006 | 11:16 AM
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Originally Posted by mumu_624
The Bolts could be bad!!!!
Bad header bolts, huh? That's a first.
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Old Jul 6, 2006 | 07:52 PM
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LOL yeah bolts can't really go bad unless you strip em. The reason why you lost the last two is they most likely vibrated out. It happens. It's why I splurged and ended up getting the Breslin Split-Lock Header Bolts they cost frickin 87.00 but they will never come loose
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Old Jul 8, 2006 | 12:14 PM
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anybody know what size header bolts these things take. cuz i tried getting the one i bought from auto zone threaded and it wouldnt thread. but it might be because it broke off in there.
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Old Jul 8, 2006 | 01:01 PM
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lock tite?
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Old Jul 8, 2006 | 01:05 PM
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You can't use lock tite due to the fact that when it heats up it will warp the plug hole and cause loss of compression through the hole.

From experience DO NOT use ARP header bolts. They come loose ALL the time and are JUNK. Get some of those stage 8 locking header bolts and you'll be set. Go to ARPs site and they have the thread size listed for our cars.
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Old Jul 8, 2006 | 01:09 PM
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what about that copper locktite stuff?
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Old Jul 8, 2006 | 02:40 PM
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dont use any thread lock either by stage 8 stainless bolts with the locks which are a pita to put on or buy some breslin bolts which screw in and then have a center to screw in with an allen like a drywall screw then neither of those can back out.
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Old Jul 8, 2006 | 03:46 PM
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All they did was backout..header bolts do it all the time. Get some lockwashers.
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