headers confused
Thread Starter
Safety Car
Joined: May 2005
Posts: 4,176
Likes: 7
From: Jennings LA
headers confused
I know hooker 2151 headers for a L98 will fit on a LT1 with a little modification ( I am deleteing the AIR system). but I read where headman elites for the L98 will not because of the height of the exhaust ports. I am confusded 
why is that the hookers will work and the headmans won't. why are long tubes for the LT1 so expensive?
why is that the hookers will work and the headmans won't. why are long tubes for the LT1 so expensive?
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
I believe it is the standard Hedman headers that have the exhaust port mismatch. I don't know that has ever been verified with the Elites. Check with Corvette Kid. I think it was he that first announced the interference.
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RACE ON!!!
Burning Brakes
Joined: Aug 2006
Posts: 1,061
Likes: 99
From: Seattle WA
I think agent86 did a nice show and tell of the hedman elites. You may have to search the archives to find his post.
The later l98's and lt1's have the same raised exhaust port (d-port). So, there shouldn't be an issue bolting them up to the heads and covering the ports.
The later l98's and lt1's have the same raised exhaust port (d-port). So, there shouldn't be an issue bolting them up to the heads and covering the ports.
Thread Starter
Safety Car
Joined: May 2005
Posts: 4,176
Likes: 7
From: Jennings LA
"Or you can buy the same header for around $120 at Jegs or Summit. These headers do NOT properly match the D ports on the later L98 heads though, blocking off the top which is the most critical part of the flow. I don't know how Hedman can list them as fitting up through '91s because of this. Caveat emptor...."
Le Mans Master
Joined: Jun 2006
Posts: 5,642
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From: One day you're a Comet...the next day you're dust... Arkansas
Hedman now lists an Elite for just the 1987 thru 1991. Part # 68487. I believe these are intended to fit alumunum heads including D ports. www.summitracing.com Rather than depending on an old post with unclear wording why not just call Hedman to be sure.
Thread Starter
Safety Car
Joined: May 2005
Posts: 4,176
Likes: 7
From: Jennings LA
Hedman now lists an Elite for just the 1987 thru 1991. Part # 68487. I believe these are intended to fit alumunum heads including D ports. www.summitracing.com Rather than depending on an old post with unclear wording why not just call Hedman to be sure.
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Thread Starter
Safety Car
Joined: May 2005
Posts: 4,176
Likes: 7
From: Jennings LA
I called them today and that was a waste of time. they said they could only gauarnty the fit up to 91. they said there must have been a body change after 91, see how much they knew about it. so if a 91 is a raised "D" port and the LT1 is the same raised "D" port I see no reason why they should not work (I am eliminating the AIR system). I will put the oxygen sensor in the collector. anyone see a problem with this plan?
Thread Starter
Safety Car
Joined: May 2005
Posts: 4,176
Likes: 7
From: Jennings LA
I suupose, I just thought their technical department could do more than look up the application and read it to me. I knew the application before I called them.
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
Remember they have many issues to deal with that concern fitment other than the exhaust port. I certainly don't know all of them but if those headers would fit a LT1 without issue, I'm pretty sure they would expand their application years. Why pass up sales if it would fit without issues? You can probably make them work, it will be interesting to see.
Drifting
Joined: Aug 2006
Posts: 1,326
Likes: 18
From: Los Angeles California
Hooker 2151 headers require a few more modification steps than you may think to get them to fit an LT1/LT4. You will need to know that the following steps are necessary:
http://forums.corvetteforum.com/show...post1561629261
For example the Hooker 2151 super comp longtubes that everyone loves to install were designed for the L98 but can be made to fit an LT1, or in my case an LT4. Here are the changes I had to make to make them work:
-Grind a little bump off of the frame that hit one of the primaries. No biggie.
-Grind about 1 mm off the edge of the motor mounts, and reverse the motor mount bolts so the primaries do not hit.
-Stretch by hand the brake lines coming out of the master cylinder until they were out of the way of one of the primaries.
-Eliminate the AIR system and cats. (I don't have EGR, since it's an LT4)
-Pay an exhaust shop $50 to block off the O2 bung on one of the primaries, and put two more O2 bungs farther down on the collectors.
-Eliminate the stock spark plug wire holders, use wire ties and plug wire separators instead.
-Eliminate the alternator brace and instead secure the alternator to the accessory brace with a bolt and some washers.
-Re-use two of the stock exhaust manifold bolts (the ones with studs on the end) so that you can keep your A/C brace and your oil dipstick. To reuse stock bolts you must use spacers between the bolt and the header, but luckily the proper spacers were included with the headers.
-Grind a very small amount off the analog ECT sensor to allow the headers to be fed in from the bottom.
-Purchase an O2 sensor wire to extend the driver's side O2 sensor wire.
-Pay an exhaust shop another $150 to cut off the ends of your stock exhaust, and then weld flanged expanders on so that it mates with the headers.
-You no longer have bungs for the rear O2 sensors, so you must now wire up an O2 simulator to trick the computer into thinking there are still cats. If you do not, fuel trim will be adjusted slightly by the computer to try to get the cats working better, according to the FSM.
-Grind a little bump off of the frame that hit one of the primaries. No biggie.
-Grind about 1 mm off the edge of the motor mounts, and reverse the motor mount bolts so the primaries do not hit.
-Stretch by hand the brake lines coming out of the master cylinder until they were out of the way of one of the primaries.
-Eliminate the AIR system and cats. (I don't have EGR, since it's an LT4)
-Pay an exhaust shop $50 to block off the O2 bung on one of the primaries, and put two more O2 bungs farther down on the collectors.
-Eliminate the stock spark plug wire holders, use wire ties and plug wire separators instead.
-Eliminate the alternator brace and instead secure the alternator to the accessory brace with a bolt and some washers.
-Re-use two of the stock exhaust manifold bolts (the ones with studs on the end) so that you can keep your A/C brace and your oil dipstick. To reuse stock bolts you must use spacers between the bolt and the header, but luckily the proper spacers were included with the headers.
-Grind a very small amount off the analog ECT sensor to allow the headers to be fed in from the bottom.
-Purchase an O2 sensor wire to extend the driver's side O2 sensor wire.
-Pay an exhaust shop another $150 to cut off the ends of your stock exhaust, and then weld flanged expanders on so that it mates with the headers.
-You no longer have bungs for the rear O2 sensors, so you must now wire up an O2 simulator to trick the computer into thinking there are still cats. If you do not, fuel trim will be adjusted slightly by the computer to try to get the cats working better, according to the FSM.
Thread Starter
Safety Car
Joined: May 2005
Posts: 4,176
Likes: 7
From: Jennings LA
Remember they have many issues to deal with that concern fitment other than the exhaust port. I certainly don't know all of them but if those headers would fit a LT1 without issue, I'm pretty sure they would expand their application years. Why pass up sales if it would fit without issues? You can probably make them work, it will be interesting to see.
Didn't know that was you.
Melting Slicks
Joined: Sep 2003
Posts: 2,270
Likes: 118
From: N. Babylon NY
I guess I will be the guinea pig on this one. I am going to try it and will post pics. for $379 for coated long tubes with a a 3/8 flange and 14 gauge primaries it is a hell of a deal, that is half the price of some of the others. I think the reason for not listing the LT1 is the fact they have no provision for the AIR tubes.
Hi,
Did this work out for you?
Thanks,
Steve
Thread Starter
Safety Car
Joined: May 2005
Posts: 4,176
Likes: 7
From: Jennings LA