Apparently my engine swap isn't going to qualify me for 1980 E-test standards so its no more long tubes and back to plan A. I was wondering wich headers to put on my LT1? I know the slp's are good to go, but I like the idea of hookers better. Plus, I heard that they fit better and have a better Y-pipe. I talked to a tech at hooker about my car and he told me that I'd need to put on 2210's since they are 1 3/4 and would be better suited for the LT1. Having said that, all hookers shorties for LT1's are 1 5/8? I guess the question I'm getting at is it really necessary for me to have 1 3/4 or are all these tech guys talking out their ***?

 

Anyone?

 

Do you run cat with your setup? If not that might help your problem.

EDIT: I think I might have misunderstood your concern. Hooker 2055's are great for any SBC in a Thirdgen minus the LS1. But I have heard roomers of the flange shrouding the ports some. I’m not sure if this would cause a problem. But I think the SLP's do not shroud the LT1 heads but if you upgrade to the LT4's I think you run into the problem again. Can someone verify this for him?

 

i would go with the 2055's but it depends on how much power you want to be making. IIRC 1 5/8 headers are good up to like 475 horses, so it all depends. The 2055's are a great header and an amazing y pipe.

 

I've been told that the LT1's have D ported heads and that the 1 3/4 are better suited for them. But I mean if 1 5/8 are so bad then why would hooker make them for the LT1? I don't know, I guess I'll call hooker with my concerns and see what they say. The guys at SLP say i need 1 3/4.

 

The SLP 1.75's I KNOW fully cover the LT1's exhaust ports, I KNOW hooker 2460's dont, havent had 2055's in my possession.

IMO the SLP's fit great and ok the hooker has a hair bigger Y pipe tubing, the SLP's have a hair bigger primaries, which actually will perform better, who knows, but if the primaries are smaller and blocking a portion of your exhaust port, a tiny bit bigger Y pipe isnt going to help you much.

 

Thats the thing, I'm pretty much set on getting the SLP's. I've just heard that their can be install issues with them so I thought maybe the hooker's would suffice. I'll just play it safe and go with the SLP. I wish they still made them stainless. All of their headers are coated now and cost big bucks! Plus install kits!

 

I'm buying the SLP because the primaries are 1-3/4" AND the Y-Pipe is 3". I'm installing a catco 3" OEM style hi-flow cat, and a hooker catback system.

If I can get a shop to make me a true dual 2.5" setup thru the stock loaction like Wille, then I will do that... but I'm still using SLP 30005C headers.

 

I'm going to run the coated SLP's into a magnaflow cat and a 3" cat back into the loudmouth resonator and one 3" tail straight through.

 

I would go with the SLP's and upgrade the Y-Pipe if it is not up to snuff. The Y-Pipes are cheap enough.

 

The SLP's fit fine, any issues are with a tweaked car, or an installer.

 

Apparently I'm going to have to modify the Y pipe because of the engine swap. I'm just going to have my mechanic cut and do whatever he has to do to get it done. Nobody in town does mandrel bends so I'll stick with the modded SLP Y pipe.

 

Modify the Y pipe ? wtf ?

 

The tech at SLP and my mechanic both confirm that we're going to have to modify the Y pipe. I don't really know exactly what the problem is but the jist of it is that the LT1 presents some clearance issues underneath for whatever reason and the Y pipe will need to be cut in order to clear. The tech at SLP said consider yourself warned and I told him its no big deal my mechanic will figure it out. When we put the LT1 in he had to make a Y-pipe out of both , the one that came on it and my old one.

 

Go figure i've had SLP's on two different thirdgens, with two different LT1's and not once did I have to change anything about the Y pipe......

 

i have the hookers on my d-shaped fastburn heads they matched up like a champ i did have to do so work on the header gaskets though as for them fitting i bolted mine on to the heads then droped the motor in with them on fit awsome and love the y-pipe

 

Did you do any checking at all with a D port gasket, or just bolt them on and not see into the exhaust port ? Info on this is appreciated as I will need a new set of headers soon and since SLP has turned into a holes and forced their poor quality coating on everyone a set of their headers is $700 now, rather than 400 or 375, at that price level they can keep them, many complained before when a set was about 400, that was reasonable IMO, but 700, no thank you i'll take my business elsewhere.

 

i have a set of 2055's on my vortec heads, and they appeared to match up fine. i love the sound and the performance!

 

I hope your right Z28*****. Thats incouraging, maybe it'll just go right in and fit. I must agree, I hate getting molested by them for $659 then $100 or so for a install kit. It all adds up to rape!

 

The only instance I know of that you need to modify them is if you run a moroso oil pan, both the thirdgens i've installed them on had the stock LT1 pan. You will need to get the 2nd O2 sensor fitting welded in, thats about it.

 

I hope your right bro. I'd be stoked if it went that smoothly. Sounds like you've had the experience so I guess we're gonna find out!

 

I was just wondering if I could also purchase the mac Y-pipe for my third gen and swap it with the SLP. The mac is 2.5" a side with a 3 ' collecter, while the SLP is 2.25" I believe. Anyone?

 

The SLP is more like 2-3/8, the slp's arent going to line up with a mac Y pipe, not to mention you probably wouldnt see THAT big of a gain from it.

 

Thanks.

 

I'm running slp 1 3/4" shorties on my lt1 I ground the ports of the headers out to match my ported heads. The y pipe fit without any problems. The only thing that I had to do was dimple the number 3 primary tube to clear my stearing shaft. While I'm sure that long tubes would be better, They are not that bad I'm presently making around 400whp with them.