Hey guys I have a 1991 Camaro Z28 with the stock L98 350. I want long tube headers. All the searching I do takes me to the V6 threads. I just want long tube headers to throw on my vehicle right into cats. I am in PA and no muffler is needed on this this so What headers will fit? I would like the to have the 3" diameter collector. Thank you.

 

Hedman headers 68460, they are the cheapest you will find for LT's. Listed for 179 on summit, also they are the 3 in collector.

 

Thank you but I don't know if this matters. I don't have the LT block I have the L98. Would they still fit in my 91 Z28 L98 vehicle? Thank you.

 

When I say LT's I mean longtubes. I don't think it will matter, but I am not an expert.

 

Ok I will ask summit to be sure. I thought you meant the LT1 motor. Sorry about that and thank you.

 

I am now running into another problem. I contacted Summitracing tech Support about getting LT headers for this vehicle. They stated, If I got LT headers. I would have to run a Y pipe to keep the proper blow back that keeps the valves properly lubricated. and the o2 put would only read 1 back and cause the to not run lean enough or too lean. I don't remember what exactly they said. Anyone encounter this problem and find how to fix it? Thank you.

 

None of that is true.

 

Well I told him I was just running the headers ring into cats separate. no pipes or mufflers. Would that play a factor?

 

Please advise on how its not true. I am really weary about doing this now. Thank you.

 

There's no room for cats with long tubes, especially with a 700R4.

Valve lubrication doesn't depend on any exhaust effects. The stock O2 sensor setup only reads one side of the engine already. 68460s don't have an O2 sensor bung, but as long as you mount one close enough to the collector it will work fine. Use a heated sensor if you're worried about it.

 

That's what I had planned to do in the beginning. I will weld a bung in and use a heated. This info came from there tech support they should know this stuff. Are there and mechanics/engineers that have dealt with this to verify if the information is correct or not? I need facts not opinion. Not saying what you are saying is opinion I really want results. I don't want to be wasting money. Also if the Cats are welded up to the 3" collector how will there not be room? Thank you.

 

Crawl under your car and have a look where the collectors are going to be.

 

Will do thank you. Also if I do this and I reach 65-75 mph on the highway the car wont chock or make any kind of noise do you know? I was also told this by summit. Thank you.

 

Sorry what I meant was,"Also if I do this and I reach 65-75 mph on the highway the car "will" chock"

 

LOL it only too a year. Just an update. i ordered these headers only to find out I have straight heads and not the angles aluminum heads these call for. They do not fit the stock L98 model that's official.

 

I have them on straight-plug heads.

 

I stand corrected

 

I am going to see what is stopping them from fitting.

 

I was told they will bolt up. the problem is that they would cover the spark plugs and you will not be able to get them out or but a spark plug wire on them. How did you get around that?

 

Forget LT's, you need these:




No plug or wire problems

 

Honestly it sounds like you should forget the LT's and go with shorty's. Not trying to be a *** anything. But it would make life much easier for you. If you do go with LT's be prepared to spend some coin if you can't run the exhaust yourself. I just done my LT's with dumps before the rear axle. I spent a lot of fab time doing this project to get a good clearance.
And you will not see much, if any gain between shorty's and LT's with a stocker.
In short... Stay with shorty's

 

Thanks man That's what I am doing shorty's until I run the motor in the ground and do an LS swap. just wish I knew this with out buying the LT's first. I am selling them now if you guys know anyone that wants them. They come with collectors/reducers. $120.00 or best offer: Shipped.

 

What headers and y-pipe combo is that in the image? Would you make and sell y-pipes for the Hedman 68470 or the Hooker 2460? Good source for 3 inch y-pipes are hard to find.

Thanks
Daryl

 

Those are Dyno Don brand.

 

So that's why I could not find those headerS at Jegs or summit! Very, Very Nice!!!

 

Dyno Don makes Headers for dual cats cars also..You car will run in the mid to low 13's

 

Can't go wrong w/ Dons Headers.....

 

 

I have they on my 87 firebird formula 350 68460

 

me too