Speed Engineering LS Swap Headers Findings

[TA_C10]

Originally Posted by gringoloco

Use a mechanically locking nut instead of the nylock, problem solved. They are very slightly ovaled so that they don’t back off

Uh, what are these, you have a name or a picture cuz this sounds like a great idea!

Originally Posted by crakarjax

I'm wondering if you can rotate the mount so the clamshell is more towards the bottom of it?

Explain this, how can I rotate the clamshell? I have sliders and mounts kit from performance online.

[crakarjax]

Can anyone say how much louder these headers are vs. manifolds? I've got LTs on my other car and they kind of drone, which is cool at first but not so much on longer trips.

[stevenbear72]

Been thinking about buying a set as well.

[jjzepplin]

I think I am getting a set of the 1 7/8. Seems they could put a v band on the collector and it probably could solve a lot of shipping issues and make us all happier. They are cheap enough to add a few bucks to the price for the peace of mind. I've got the f body setup with a T56. It's all in mock up right now. Anyone running this setup yet?

[derotoreut]

I'm using them on my K10 swap which is currently in process. I bought the shortie version (25-1021) because I have a 4WD crossmember to contend with. These will give me more room to work my exhaust around/through. I also decided to send them out for ceramic coating.

[jjzepplin]

The spark plug clearance looks pretty good on the drivers side. How about the passenger side?

[derotoreut]

Originally Posted by jjzepplin

The spark plug clearance looks pretty good on the drivers side. How about the passenger side?

Good on both sides.

[69GMC2004]

Any chance anyone has used the 1 7/8" long tubes with a No Limit rack and pinion?

[Pitpig]

Bought the shorty version for around $200. Fit great , but have to trim passenger side ear off th 400

[Lugnutz65]

My Vortec 5.3 is on a run stand and has 2001 Camaro LS1 manifolds. They hug the block nicely.
I intend to keep a manual tranny and from the looks of things these manifolds will interfere with a hydraulic clutch slave.
So I want to know if maybe these Speed Engineering headers will give me more room. I know they will fit nicely between the frame rails of my 65 C10.
Anyone willing to make a few measurements?

[clay68c10]

I have the long tubes and there’s no clearance for a Novak external slave.
Not a great pic, but it kind of shows the lack of room.

[Lugnutz65]

Thanks. I’m thinking the shorty headers turn down sooner but that’s the clearance info I need. I’m sure others have mated Tremec trannies. I just need to see their setup. I don’t think a Novak setup will work for me either.

[jjzepplin]

My 99 Fbody manifolds would not fit my 72 Blazer. I got the 1 3/4" long tubes and the passenger side needed the frame massaged a bit to fit right. I just bent the frame up a bit. I am mating the T56 to it and other than that the headers seem to be a pretty good fit. I am however planning on using the original F body Master cylinder which if I am correct would be in a totally out of the way spot. I am still mocking everything up at this point.

[Captainfab]

If header to clutch slave cylinder clearence is an issue, you can always change to a hydraulic release bearing.

[Willie Makeit]

got a brand new set in the box that i won't be using due to the fact that you have to cut the "ears" off a 4L80e to run them.

[STOCKISH]

Originally Posted by Willie Makeit

got a brand new set in the box that i won't be using due to the fact that you have to cut the "ears" off a 4L80e to run them.

price to 27612?

[Willie Makeit]

Originally Posted by STOCKISH

price to 27612?

sold locally

[shortbed70]

I know this is an old post but I’m wondering how they have held up or if there is a better brand that won’t break the bank for an 65 c10 with a 700r4 2 wd that doesn’t hang way down below the frame...

[Acregger]

Sorry cant help with how long they will hold up but I have to say they are pretty well built and do fit very nice for the price. So far I am happy with them

[clay68c10]

I’m going to use an internal slave. Check out gringoloco’s build. He’s running a TKO with an internal slave.

[LS short box]

I've had them on my 68 C10 LS swap for 3 years with zero issues. As much as I hate China made stuff I just couldn't see spending $800-$1200 for US made. My LS is a small cam LS1 so not huge horse power. If I was running a big HP engine I would not buy the Speed Engineering headers. The best designed headers have the longest gradual turn down after the exhaust port. If you look at the SE header design they take a tight bend after the exhaust port.

[lts70]

Has anyone used their mid length? Trying to decide between mid length and long tube. See lots of information on the Shorty and Long but doesn’t seem to be much info on the mid length.