LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

AS&M header problem

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Old Apr 10, 2004 | 10:04 AM
  #16  
Loadre's Avatar
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From: Kingsport, TN
Originally posted by Mindgame
-Mindgame
you're back?
Old Apr 10, 2004 | 10:26 AM
  #17  
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From: Hell was full so they sent me to NJ
Originally posted by sc93
Isn't George Baxter running an Art Carr 700R4 transmission with that 1300 hp setup?
NO!!

Art Carr built him two "1,000HP" 700R4's.... the first one failed at about 850HP, the first day he had it, and tried a couple of quick launches on a side street near his house. Carr rebuilt it, and beefed it up, and the thing failed when we were driving it home from the shop and he made a pull from a 25mph roll to about 130mph getting on the interstate 30 miles from the shop..... crapped out again.... never made it to the track.

Carr replaced it with a TH400 that lasted through the 9.04@155mph pass. It wasn't in real good shape when they fired the car up with the new engine, so its been rebuilt by a local shop in PA that builds some killer trannies.
Old Apr 10, 2004 | 10:38 AM
  #18  
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Originally posted by Loadre
you're back?
In the cyberflesh.

-Mindgame
Old Apr 10, 2004 | 11:01 AM
  #19  
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Fred,

Interesting about the AS&M vs Hooker testing. I've always felt that the short headers (all else equal) might have an edge on the peak numbers. They tune at a higher rpm. But what about the low-midrange torque numbers? What were the findings there?? Just curious, thanks.

-Mindgame
Old Apr 10, 2004 | 12:23 PM
  #20  
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From: Fairfield, ca
I ordered my as&m headers with a single cat conversion package about 2 1/2 months ago. I went with as&m because i didn't really want LT's and they are supposed to be the next best thing.

Well i tried to get them installed last friday a week ago and my car is still in the shop because of crappy quality from as&m. The very 1st set they sent me was defective because of warped flanges. The 2nd set they sent the #2 primary was too close to the bolt hole there and it was impossible to get any bolt in the hole. So i complained to them and they overnighted another set to me and still that is defective. They have the same problem with that set also. Also the drivers side primary was hitting the steering colum badly. The shop would have to do a lot of modifying to get it to work.

So the end result is as&m is gonna refund me all my money. The shop is gonna install some Hooker LT's for no extra charge.
Old Apr 10, 2004 | 02:48 PM
  #21  
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From: Ohio
Originally posted by drewstealth

The 2nd set they sent the #2 primary was too close to the bolt hole there and it was impossible to get any bolt in the hole.

i also had that problem; figured it was just the design of it so i found a shorter header bolt and struggled but did end up getting the bolt in.
Old Apr 10, 2004 | 03:01 PM
  #22  
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Yeah the 2nd set i got there was no possible way to get even a stud in because it was so close. The 3rd set i got it the primary came pre-dimpled. Then the shop cut down one of my stage 8 bolts to get in on. The finally did but then the drivers side header was hitting the steering linkage badly. It really sucks too because i wanted to go with the as&m mids instead of the hooker longtubes even though almost everybody recommends getting LT's over anything else.
Old Apr 10, 2004 | 10:58 PM
  #23  
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From: Ohio
drewstealth, that's wierd, did they actually have the header bolted in and it still hit the steering knuckle, or could the shop not get the header in position because of hte steering knuckle. i removed my knuckle, installed the header, then reinstalled the knuckle. it's a very tight fit but i have no clearance problems.

now if i could only figure out how to get a tool on the bolthead and nut at the collector-ypipe flange on the passenger side, i'll be in bussiness!
Old Apr 11, 2004 | 10:26 AM
  #24  
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From: Hell was full so they sent me to NJ
Originally posted by Mindgame
Fred,

Interesting about the AS&M vs Hooker testing. I've always felt that the short headers (all else equal) might have an edge on the peak numbers. They tune at a higher rpm. But what about the low-midrange torque numbers? What were the findings there?? Just curious, thanks.

-Mindgame
Sometimes theory and reality don't match up too well, and I can't really understand why.... In theory, shorter primaries, better top end. That probably explains why the AS&M's were better on the top end.... and remember that this is on an engine that never runs below 5,000rpm at the track.... so he is only interested in how they perform (area under the curve) from say 5,000 - 7,500rpm. The peak HP with the Hooker LT's was down more than 50HP.

But, then at the next level, the Hooker LT's seemed to catch up, and show an advantage as they continued to boost the HP. After he went over the 1,000HP level, he never tried any other headers, so who knows if the Hookers were still the optimum selection. He couldn't try the AS&M's any more, because they were on my car .

As far as quality.... when he bought the AS&M's new, the flanges were warped and he had them milled. I don't remember any problems with the #2 bolts, but this has to be at least 6 years ago. When I installed them, all the bugs were worked out. And I don't think the Hookers have ever been proven to be problem free.... one of the exhaust shops that was making LT Y-pipes was blown away by the massive drop in quality when Hooker started assembling the LT's in Mexico.
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