lol 
Fast 102 with LS1 injectors .
Thread Starter
On The Tree
Joined: Jan 2010
Posts: 124
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From: San diego , CA
Fast 102 with LS1 injectors . Hey guys,
I'm a little confused about the Fast 102 setup on LS1 , I already have an OEM LS2 fuel rail and fast 36 (ls1) injectors , I know the ls1 injector is tall and I’ll have to get a spacer for the rails but the question is , will the (ls1) injectors fit the ls2 rail directly ? What other things I might need?
Thanks.
I'm a little confused about the Fast 102 setup on LS1 , I already have an OEM LS2 fuel rail and fast 36 (ls1) injectors , I know the ls1 injector is tall and I’ll have to get a spacer for the rails but the question is , will the (ls1) injectors fit the ls2 rail directly ? What other things I might need?
Thanks.
no, LS2 injectors are shorter, and have a different plug. The rail won't sit on the intake so you can bolt it down. There is an adapter kit to make it work, I can't remember who sells it, but the magic Google knows
You need;
Lower orings (comes with 146302 manifold)
Spacers (between fuel rails and manifold)
Bolts (for fuel rail/spacer/manifold)
Washers
Your basically making a 146021-KIT but using your own fuel rails. Call FAST and get the extra parts. They have them already.
Lower orings (comes with 146302 manifold)
Spacers (between fuel rails and manifold)
Bolts (for fuel rail/spacer/manifold)
Washers
Your basically making a 146021-KIT but using your own fuel rails. Call FAST and get the extra parts. They have them already.
On the LS1 injector on the LS2 rails, shouldn't we convert to an LS2 top o-ring? I asked for 06 GTO top o-rings at the parts store, and they are definitely beefier. I test fitted them in my LS2 fuel rail, and they fit well, haven't tested the LS1 o-rings in the LS2 rail... thoughts?
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Verdad Gallardo Thread Starter
On The Tree
Joined: Jan 2010
Posts: 124
Likes: 0
From: San diego , CA
All I need now is the Bolts and spacers .
Thank you very much your help SweetS10V8 .
Oh yeah, the orings only come with the cathedral port intake #146302. So if you did an LS3 head swap, and planning on using the LS3 FAST #146102, youll need to order the orings seperate as well.
Thread Starter
On The Tree
Joined: Jan 2010
Posts: 124
Likes: 0
From: San diego , CA
Cathedral port heads FTW
Thanx again .
This is a good question. Does anyone have a part number or know exact make/model/yr of car to order a set for? About to get my setup installed but need lower o-rings.
in need of the same information about lower o'rings needed for ls1 injectors? Anyone? 
Teching In
Joined: Jan 2016
Posts: 11
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From: CT
Ok so thanks for the info and sending me the lower o rings .I attempted to mount fuel rails on the intake and apparently need the spacers as well as I stated in earlier post.. I assumed I was getting the spacers as well ..so can I get some help with the spacers.please
Ok so thanks for the info and sending me the lower o rings .I attempted to mount fuel rails on the intake and apparently need the spacers as well as I stated in earlier post.. I assumed I was getting the spacers as well ..so can I get some help with the spacers.please
Teching In
Joined: Jan 2016
Posts: 11
Likes: 0
From: CT
I tried to send a message again not sure why its not going through ...but as I stated in my earlier post I was looking for the ( o rings and the spacers ) im not sure what the problem was with the communication but didn't get what I needed now I am more than frustrated trying to put this together without having what I need.
