LS engine swap info

[89 crewcab]

thank you for the info

[bigboyitm]

I have probably over looked it, but I have looked. I am looking for a DIY on the mods that need to be done to the wiring harness for an LSX. I bought an entire truck that I will be pulling the motor and tranny out of, 04 2500 Truck LQ4 4L80E.

[thor]

Check LS1tech.com for wiring diagrams and such. Unless someone posted on here and I missed it.

[structures]

I got all my wiring diagrams from autozone.com under the repair manual section and referred to the guidance provided on www.LT1swap.com. But I don't actually have a running engine yet.

[fpjr0]

my .02 I got all I needed when I did my 5.3 swap from the lt1swap page mention above...it took about a weeks worth of studing the diagrams and reading on the web and about 6 or 7 hours of actually cuting and re routing the some wires \.

[aggie91]

suscribed so that I can find this one later...

[K-TEN]

Great thread and thanks to all.
I'm putting a 4.8 and 4l60e from a 2000 truck into a '51 GMC suburban. It looks like it all fits pretty well except for the pass. side exhaust manifold. I need something that is shorter or longer, to get by the top of the frame rail. What would be a better stock ex manifold?
Also, the engine leaked out orange anti-freeze. Can I run traditional green AF in this motor without any issues?
I broke one manifold bolt, but it'll come out. What is the least expensive but proper replacement for those? This is a major league cheapo build. And I'm sure I'll have plenty more questions. I got the motor trans and redone harness for $1400 bucks. Which is cheaper than rebuilding a 6 banger. Thanks again..

[Thealien]

You can run regular antifreez (I would try to flush all the dexcool out though)

Prestone (others might also) Makes a universal antifreez that is supposed to work with both types.

Some people use Fbody (camaro/firebird manifolds 1998-2002?)

I am using trailblazer SS manifolds that hug the block nicely (but mine is 4 X 4)

I would just get some manifold bolts from a dealer, parts yard? I use copper never sieze as they are prone to breaking. I use a torque wrench also.

Good luck with your swap

[K-TEN]

looks like Dorman makes a TBSS or SSR manifold for under $100. p/n 674785 or maybe the 675525
Do you run washers on the manifold bolts as some are suggesting?

[Thealien]

I didn't as I used stock manifolds and stock bolts. After installing everything and hearing how many have had broken exhaust bolts so a month ago I removed every one and put high temp never seize and reinstalled and torqued every bolt except the couple I couldn't get the torque wrench on.

[Firebirdjones]

I used the stock bolts as well, which don't need washers because they are already a shouldered bolt.

I install with antiseize which is common practice for me with anything aluminum. Steel bolts and aluminum parts don't mix well.

I used the 3/4 ton truck manifolds on my swap, they are said to be some of the better flowing manifolds out there as far as trucks go. I had to slightly notch the frame however because they kick out a bit, which is what helps them flow as well as they do. I sent mine out to be extrude honed as well.

[K-TEN]

Who knows about stock exhaust manifolds? The original truck (2000 4.8) manifold sits just above my frame rail. I'd like it to be shorter by at least 2 inches, or if it tucked tighter to the engine by about 2 inches. I'm looking at the SSR manifolds. They SEEM to be shorter, but I have no way of knowing at this time. Dorman has the repros for about $140 or so with the gasket and studs. The GM Dealership can get me a new GM part(SSR pass. side ex manifold) for just over $80 bucks. (No gasket or studs).
Can anyone tell me if the SSR manifold is actually shorter than the original truck manifold? Thanks.
(1951 GMC suburban w/ 4.8 and 4l60 and '65 truck 12 bolt going in)

[Clyde65]

I used the Sanderson Shortie Headers CSLS1 and have not had any issues at all, no leaks not fitment issues at all.

[grennberet02]

I am looking for a cost effective header. Where did you purchase. I do not prefer thin headers.

Did you do the duals or dual to single?

Did you place the 02 sensor right after the header?

[Firebirdjones]

No one makes a long tube header for the LS 4x4 blazer swap.
I looked around and only found shorties, which didn't interest me. They aren't worth much power over the truck manifolds, which are actually a decent flowing piece, said to be one of the best LS manifolds aside from the vette. For $500 for shorties I elected to just use the truck manifolds.

I simply made some exhaust pieces out of mandrel bends to connect the manifolds to my current exhaust system, which is a dual exhaust. I then welded in 02 bungs right after the exhaust manifolds in a convenient spot.

At some point if someone comes out with long tubes, I'll swap over.

[mooseknuckles]

.....most guys are using long tube camaro or chevelle ls swap headers..they seem not to hang lower than the frame...but if it's a 4x4 it wouldn't really matter anyway?

[Firebirdjones]

Originally Posted by mooseknuckles

.....most guys are using long tube camaro or chevelle ls swap headers..they seem not to hang lower than the frame...but if it's a 4x4 it wouldn't really matter anyway?

I haven't seen that done in a 4x4 swap yet. Plenty of 2WD's though.
I'm not sure what year camaro you are speaking of. I have 2 4th gen camaro's here with LS engines and long tube headers in both. The driver side header collector has a weird kick out toward the rocker on both cars (to clear bellhousing) at about 20 degrees. That would be nearly impossible to make work in a 4x4 blazer when you have a pair of crossmembers and a transfer case to deal with.

My chevelle and 1st gen camaro doesn't have an LS in either, so I have no idea what those swap headers look like. Guess I'm just not willing to experiment with a $700+ set of headers...but I'd plunk the money down in a heart beat if something out there on the market worked for certain.

I was hoping someone would chime in with pics that has actually done this but it doesn't seem to be a popular swap as of yet?

[thor]

How about the Doug Thorley headers for LS swaps into 67-72s? I think part # 324Y-C. As for cost effective, that's a different matter.

[Firebirdjones]

Originally Posted by thor

How about the Doug Thorley headers for LS swaps into 67-72s? I think part # 324Y-C. As for cost effective, that's a different matter.

Those are only 1 5/8" primary tubes, and all the Dougs truck headers are of the Try-Y design.... Guess if you are just looking for a set of headers and didn't mind those details, these would get the job done for you...
I prefer at least 1 3/4 for a small LS, or 1 7/8 for larger LS.

[Billett]

Originally Posted by Firebirdjones

Those are only 1 5/8" primary tubes, and all the Dougs truck headers are of the Try-Y design.... Guess if you are just looking for a set of headers and didn't mind those details, these would get the job done for you...
I prefer at least 1 3/4 for a small LS, or 1 7/8 for larger LS.

Actually they do sell larger versions. 324y-c is the 1-5/8" version but 323y-c is the 1-7/8" set. I called up Mike just last week and ordered a set and he gave me a great deal on them.

Also, tri-y headers are great for low and mid range power they just lack a bit of the top end that long tubes have. Since I don't plan on running my truck at 6500rpms all the time I think they'll be fine.
Posted via Mobile Device

[ChevyCruizer]

Would you like to share your contact information for Mike? website, vendor link, etc?

[QUOTE=Billett;6092551]Actually they do sell larger versions. 324y-c is the 1-5/8" version but 323y-c is the 1-7/8" set. I called up Mike just last week and ordered a set and he gave me a great deal on them.QUOTE]

[shadow1967]

thanks was lookimg for info like this!!!!

[smoky02]

I am also very interested in what headers will work on a 2wd, I'm seeing ya'll are talking about the 2nd gen LS headers and Chevelle headers, but what brand are ya'll referring to?

[grennberet02]

I used a 98 camaro driver side manifold and truck passenger side manifold. I installed an 02 bung on the passenger side as the manifold did not have a provision. The camaro dirver has a hole provision for the 02 sensor already on it.
I finally got my LS running with 0 issues. I can't believe it fired up at the flick of the key.
Now for all the other fun stuff like brakes, shifter, and wiring.

[1970 C10 MJW]

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