Injectors for MS4 cam swap?
Thread Starter
On The Tree
Joined: Jun 2004
Posts: 132
Likes: 0
From: Melbourne, Australia
Injectors for MS4 cam swap? Hi All, Sorry this is probably a bit long winded but I'd apreciate any advice you can give...
I've got a 99 model LS1 crate motor in my Shelby Cobra replica. It's got the 853 heads with center bolt covers.
I bought a MS4 cam a while back and thought it would wake it up a bit. I was thinking I'd wait till I got some good heads before installing the cam but lately I've been thinking I'd just throw the cam in and see how it goes with the stock 853 heads. It's been sitting on the shelf for a year and I thought I'd have some fun over the summer.
I've already installed a dual spring, Ti retainer and molly pushrod package from TSP and I'm running Yella Terra 1.7 ratio rockers as well.
I'm running my own 1 7/8 long tube headers, Edelbrock Victor Jr and 1000CFM 4 barrel T/B. I've also got ARP rod bolts and an LS6 oil pump to go in.
I'm running a Bosch 044 fuel pump and SARD adjustable pressure reg, it's a full return system.
I'm already running a basic speed density tune and I'm going to have to get it retuned with the new cam.
My question is: Are the stock 28 pound injectors going to be up to the task or should I replace them before the tune? What size/brand injectors would you reccomend I run for this combination?
What sort of RWHP figure should I expect it to make?
I'm running an M6 with 3.9:1 gears.
Here's the motor pretty much as it sits at the moment. I've had this pic up on the forum a couple of times.
I've just done a few more mods to the water pump setup.
Thanks.
Michael
I've got a 99 model LS1 crate motor in my Shelby Cobra replica. It's got the 853 heads with center bolt covers.
I bought a MS4 cam a while back and thought it would wake it up a bit. I was thinking I'd wait till I got some good heads before installing the cam but lately I've been thinking I'd just throw the cam in and see how it goes with the stock 853 heads. It's been sitting on the shelf for a year and I thought I'd have some fun over the summer.
I've already installed a dual spring, Ti retainer and molly pushrod package from TSP and I'm running Yella Terra 1.7 ratio rockers as well.
I'm running my own 1 7/8 long tube headers, Edelbrock Victor Jr and 1000CFM 4 barrel T/B. I've also got ARP rod bolts and an LS6 oil pump to go in.
I'm running a Bosch 044 fuel pump and SARD adjustable pressure reg, it's a full return system.
I'm already running a basic speed density tune and I'm going to have to get it retuned with the new cam.
My question is: Are the stock 28 pound injectors going to be up to the task or should I replace them before the tune? What size/brand injectors would you reccomend I run for this combination?
What sort of RWHP figure should I expect it to make?
I'm running an M6 with 3.9:1 gears.
Here's the motor pretty much as it sits at the moment. I've had this pic up on the forum a couple of times.
I've just done a few more mods to the water pump setup.
Thanks.
Michael
WOW.. that is a SWEEAAAT setup you got there..... ok im done drulling now. As for your post, I use the SVO 30 lbs. I have never had any problem with them, and they are more than enough injector for My H/C/I setup.
if they are stock 99 injectors, they are 26lb injectors not 28.5. the 98's and 01-02's i think were the only ones that got the 28.5's. that said, i went with bosch style 39lb injectors off ebay.
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TECH Senior Member
iTrader: (10)
Joined: May 2005
Posts: 5,353
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From: Bossier city,LA barksdale AFB
SVO 30's red top will be fine and cheep and so Will SVO 42's green top! I have SVO 42's and stock 99 heads with tsp 231/237 cam. I got 42's on a deal and i will be good when i add mods down the road. Make sure you car has the injectors tuned b4 you add them or you will wash you rings out!!! Remember SVO injectors are 5-6 PSI more with our fuel pressure so the SVO 30's are more like 35-36lbs 
Thread Starter
On The Tree
Joined: Jun 2004
Posts: 132
Likes: 0
From: Melbourne, Australia
So 42# green top SVO injectors are OK and would give me enough room to move up later If I built a stroker or something.
They will be able to dial them back enough when they tune it? Or is it best to choose an injector that's maxing out just above your peak HP, I mean is there a point where the injector works at it's peak efficiency?
Thanks
Michael
Last edited by LS1 Cobra; Sep 10, 2008 at 07:29 PM.
im running #42's on my set up got them with Nasty's stage 1 setup Great stuff and a great price. Just nice to know that I wont have to mess with the fuel system if I decide to do anymore work to the motor
