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Generation III Internal Engine 1997-2006 LS1 | LS6
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FASt 102/102

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Old 01-25-2013, 06:23 PM
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Originally Posted by Scoggin Dickey
We have takeoff LS2 rails for $95 shipped, although it sounds like your kit would come with that. We also have takeoff LS2 injectors that will drop right into the intake for $100 if 34# is enough for what your'e doing. You would need to get some injector harness adapters, $60ish. We have those too.
It seems as though I might as well just buy the parts from members off here and save a couple $$$. I will keep ya'll in mind and will probably take the injectors and the harness dapters.
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Old 01-25-2013, 06:50 PM
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Originally Posted by badassracing
I think they have billet rails that allow you to use LS1 style injectors. You just have to make sure you get the right rails.
Yes! FAST does make billet rails for the 102 using LS1 injectors.

FAST makes LS1 injectors in various flow rates. You could bypass the spacer kit and purchase LS2 injectors with the adapter connectors, but will cost you more $$.
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Old 01-25-2013, 08:08 PM
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I will probably stick with the ls2 style injectors and buy the harness. Money isn'tthat big of an issue right now.
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Old 01-25-2013, 08:17 PM
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The Fast billet rails work fine with LS1 injectors. Just have to put the thicker o-ring on the bottom of the injector. No spacers of any kind needed.
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Old 01-25-2013, 09:17 PM
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Originally Posted by Undertow74
The Fast billet rails work fine with LS1 injectors. Just have to put the thicker o-ring on the bottom of the injector. No spacers of any kind needed.
Yes, the spacers are if you want to use the LS2 OEM rail.
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Old 01-25-2013, 09:47 PM
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Not to hijack but this even has me confused.

How about if you have an ls3 with factory rails and injectors? Im a swap car so it makes these little things a tricky thing sometimes. What im looking at is my 408/ls3 with the factory rails and onjectors, but using ls2 computer and harness.
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Old 01-25-2013, 10:35 PM
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Originally Posted by Tainted
Not to hijack but this even has me confused.

How about if you have an ls3 with factory rails and injectors? Im a swap car so it makes these little things a tricky thing sometimes. What im looking at is my 408/ls3 with the factory rails and onjectors, but using ls2 computer and harness.
So you want to install an FAST 102 on it? LS2/LS3 use the same fuel rail and it works on the FAST 102. Factory LS3 injectors are a little too short and need a spacer with the stock rail in a FAST 102, whileas LS2 injectors are the proper length. The LS2 harness will plug into LS3 injectors.
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Old 01-26-2013, 12:27 AM
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Originally Posted by AmnSF
I saw it but didn't answer all my questions because I don't have that much understanding or experience with ls motors.

And I guess I'll be buying the ls3 102/102. The intake will match the ls1 heads?
I've read it a few times and still have questions lol. I bought a used manifold complete with rail, injectors and tb. So I've guy the rail and injector part taken care of. Though I know it's got an LS2 rail and no spacers so if LS2 injectors are the only ones that fit then they must be LS2s. Guess I'll need harness adaptors still.

Does anyone have a picture of how the LS3 coolant cross over is different?
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Old 01-26-2013, 10:37 AM
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Originally Posted by t_raven
I've read it a few times and still have questions lol. I bought a used manifold complete with rail, injectors and tb. So I've guy the rail and injector part taken care of. Though I know it's got an LS2 rail and no spacers so if LS2 injectors are the only ones that fit then they must be LS2s. Guess I'll need harness adaptors still.

Does anyone have a picture of how the LS3 coolant cross over is different?
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