What do you need to modify for L67 injectors?

[SappySE107]

Did a search to see if we had a write up, and nothing stood out. Im working on articles for wot-tech, which basically translate to 60V6 articles if we ever change the site format to make writing articles and finding articles a little less challenging. Anyway, the forum is the main source of all information, and for good reason:P I want input on this because I know not what it takes for a gen 1 or gen 2 engine to use these injectors. Maybe nothing?

Here is what I have here, 96 3400 injectors, 2000 3400 injectors, L67 injectors, and a fuel rail that uses the clips found on the 94-99 (I guess) engines.

Multec 1 3400 injector vs L67 injector. The main part of this is the identical length, but the notch for the injector clip doesn't go all the way around the L67 injector (white) where the stock injector does. Use cut off wheel, bandsaw, saw blade, etc to make the notch go all the way around and thats it for this swap.

Multic 2 3400 injector vs L67 injector. I don't have the rail to match the clip to see if this is necessary to modify the injector for the clip style, but you can see the length of the injectors is different from o-ring to o-ring. Because of this, you will want to cut new notches higher on the injector, to lower it on the rail and fit the manifold.

This picture is to show the injector rail brackets. TCE has made some in the past, and may still have them but I am not sure this is necessary. The brackets changed when the injectors changes, so running the older brackets from the 94-99 rails could be useful as well.

The multec 1 (198x-1999 60V6) connector on the left and the multec 2 (2000-?) on the right. L67 are Multec 1, so the connectors need to be adapter or spliced if you use these injectors on a 2000 and newer 60V6 engine.

L67 injector in the rail without clip. Its fully seated in the rail and the notches line up where they would for the clip to hold it in place. This goes with the next pic.

L67 injector as setup in the above pic, looking from the port face. The injector sits at the top of the injector boss. Cutting the notches higher on the injector will seat the injector lower. The TCE brackets probably took care of this as well. Bending the brackets may work as well if you want the injector deeper in the boss. This setup is the M1 rail and bracket. The M2 based brackets likely don't let the injector seat at all but I don't have a setup to compare.

If I am wrong on any of this, please post! Pics of the M2 rail and how the injectors fit would be great. Ill get a setup eventually if no one wants to share:P

[AleroB888]

[QUOTE****]what did you use to cut the slit on the top of the injector ?

I used 1/8 inch pinstriping tape to mark the cutting location.
One stripe goes on the outside edge near the O-ring.
The other is placed so the edge toward the middle of the injector just barely covers the existing slots:



The first cut is made right down the middle between the two stripes, as a guide cut. I used an Exacto razor saw #236 for that cut.
On the saw blade I put a piece of pinstripe tape to mark the depth of the cut:





After the guide cut was made, a sheet metal blade for a power jigsaw was mounted in the saw handle, then carefully worked around the guide cut to get the correct depth and width. Check the depth as you go by mounting an injector clip in the slot. Then, use very fine grit sand
paper to smooth the edges. Practice on an old junkyard one first.



These are currently used on my 1999 Alero 3400. For reference, injector on the right is out of an earlier M62 supercharged GM vehicle, rated at 28 lb.....

[SappySE107]

Would you mind posting the other pics on here? We have no control over them if they aren't here, which means they can disappear. Had it happen a lot.

Is your setup 99 or 00+? Looks like a very clean method, nice

[AleroB888]

Would you mind posting the other pics on here? We have no control over them if they aren't here, which means they can disappear. Had it happen a lot.

Is your setup 99 or 00+? Looks like a very clean method, nice

It's a 99

I opted to cut an additional notch on the L67 injectors to help them seat better. As it was, the stock Multec 1 injectors barely reached into the LIM from the fuel rail, some popped in and out easily till the rail brackets were completely bolted down. It may not have been necessary, but seemed like a good idea at the time...

[DefEddie]

I would leave the clips out,and bend the rail mounts to get it to mount tighter/lower.
No need for clips on injectors,the rail is really what holds it on.
Pull the rail and cycle the pump up and they can still shoot out even with the clips.
Bending the mount tabs would be alot simpler than cutting unneeded slots for the clips.
Kudo's for trying something different though,if you need the injector tables from an L67 seriesI or seriesII pcm let me know as I have both .bins in my files.

[Superdave]

IIRC we just cut the grooves with a hack saw blade in hand or a dremel, i don't recall modifying the rail at all.

[AleroB888]

I would leave the clips out,and bend the rail mounts to get it to mount tighter/lower.
No need for clips on injectors,the rail is really what holds it on.
Pull the rail and cycle the pump up and they can still shoot out even with the clips.
Bending the mount tabs would be alot simpler than cutting unneeded slots for the clips.
.........

I'm not so sure about that. I was concerned that if only the rail brackets were bent to change the mounting height, the angle of the injectors relative to the mounting holes would change.

Then, too, wouldn't the injectors move up and down slightly when the engine alternated from vacuum to boost?

I think it's a benefit for the injectors to be a little further out into the airstream in most conditions of operation.

[DefEddie]

Sorry,i'm not sure.
Just wanted to mention that the clips aren't actually needed,and are pretty much redundant.
I've had them blow off on me while running checks on them and not following tsb directions to the letter (ziptie injectors to rail regardless of clips while testing).
Wasn't sure if not using the clips would make this an easier swap or not,but though I would say something just in case.

[shiwnath]

L67 injectors are Bosch style not Multec 1. Also I heard that you can pull the injector harness off a 1999 and lower 60*V6 and just plug it into a 2000+ car to avoid adapters or splicing wires. The harness plug should be right by the alternator. I can't 100% confirm that though because I haven't looked into it. Gonna upgrade from 28# to the 36# soon so I'll find out!