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Hello, I have a mild build (cammed, ported, milled) L33 (flat top aluminum 5.3 with 799 heads).
I'm running the LS6 intake set up but my injectors have been sitting for years. I was wondering what a good replacement injector would be. I believe these are 28lb stock which I imagine is plenty but any input is welcome.
I like GM parts but if there's a reputable aftermarket injector i wouldn't mind a set of those.
or maybe a mail-order injector service? I can't find anything non-diesel here locally
Fix them yourself. There's lots of You Tube videos on how to rig up a pressurized system with a little 12 volt power to internally clean them and it is not usually too tough to get them back to a good spray pattern. Look up the standard resistance values for your injectors and check them with a multimeter first before investing much time cleaning them. Replace any that are out of spec. Use the good, but non-flammable Brake Kleen solvent here because otherwise, you could be mixing 12 volt sparks with explosive vapors and liquids. And I don't want to be responsible for ruining the whole rest of your day . . .
I run high concentrations of Chevron Techron fuel system cleanser in small amounts of fuel to finish this cleaning job after this initial effort.
Rick
Last edited by B52bombardier1; Aug 19, 2018 at 08:14 PM.
Why bother looking? Just go find more good injectors at the junkyard. They are ten bucks each around here. Make sure you get injectors the same flow rate and the same connectors.
Honestly though, I bought a set of remanufactured ones for a 2003 Buick Regal for $50.00 on eBay. They work great. I believe they were Delphi's if I'm not mistaken.
Where are you getting 400hp from? Gonna need one hell of a cam or boost for that. I have that exact motor with a dorman LS6 rep intake, WS6store high lift ASA cam and a BBK 80mm throttle body, scheduled to be dyno tuned next Monday - I doubt I’ll see more than 320-350. I’m using 8.1 truck injectors (NOT marine), had them benched and matched, 33lb/hr @50psi.
Where are you getting 400hp from? Gonna need one hell of a cam or boost for that. I have that exact motor with a dorman LS6 rep intake, WS6store high lift ASA cam and a BBK 80mm throttle body, scheduled to be dyno tuned next Monday - I doubt I’ll see more than 320-350. I’m using 8.1 truck injectors (NOT marine), had them benched and matched, 33lb/hr @50psi.
I think he's saying, IF he gets to the point where his engine puts out 400HP, will the injectors be big enough? I don't think he's expecting 400HP NOW.
Yeah 400 is a safe number, sorry to ruffle your feathers but I'm not building a race car, but what I got is.
Meticulously hand ported and polished 799s flowed to 325 cfm and milled .030 with carefully reworked ccs and 2.02s with one hell of a valve job... Then Ed Curtis cut me a cam to match. Tracey Scott will be tuning it day in and day out for a little bit.
So 400 ish. I'm more going for the calculated, hand-crafted by different level people that actually take their time and care (Michael Bennett (custom hand porting) Ed Curtis (custom camshaft), and Tracey Scott (At home, on street, and on dyno full service all season tuning) by the way) to create a very clean, smooth, yet powerful, pretty damn efficient little Sonoma that will do everything I want it to do.
all that aside though, should I get these ls6 28's cleaned and flowed and sealed or, if not, what brand injectors do y'all have experience with being reliable and smooth more so than yee haw hot rod status.
Yeah 400 is a safe number, sorry to ruffle your feathers but I'm not building a race car, but what I got is.
Meticulously hand ported and polished 799s flowed to 325 cfm and milled .030 with carefully reworked ccs and 2.02s with one hell of a valve job... Then Ed Curtis cut me a cam to match. Tracey Scott will be tuning it day in and day out for a little bit.
So 400 ish. I'm more going for the calculated, hand-crafted by different level people that actually take their time and care (Michael Bennett (custom hand porting) Ed Curtis (custom camshaft), and Tracey Scott (At home, on street, and on dyno full service all season tuning) by the way) to create a very clean, smooth, yet powerful, pretty damn efficient little Sonoma that will do everything I want it to do.
all that aside though, should I get these ls6 28's cleaned and flowed and sealed or, if not, what brand injectors do y'all have experience with being reliable and smooth more so than yee haw hot rod status.
Soooo with all of this name-dropping and nose-snobbery you don't know where to find some injectors? Right.
The "name-dropping" is giving credit as a token of appreciation. My sincerest apologies.
I have a small shaft and a mediocre career with a weak little truck I'm building.. boo hoo for me.
My wife is hot though.
But I dont care enough about life to be a snob. sad but true...
There's numerous places to get good "rebuilt" injectors for a reasonable cost... FIC, Southbay, etc. The truck ones are real common and cheeep, so not really worth paying for "new".
The stock truck injectors max out at something around 400 at the crank. Details vary but somewhere in there. Biggest thing you're going to run into is, the truck injectors are MUCH shorter than most others, like about ¾"; if your fuel rail setup isn't specifically for a truck, they won't work, without adapters. (not sure what options FAST offers in this regard...) 30 lb isn't much of a change, probably a good choice for a 5.3, you're never going to exceed that without boost or something.
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Little injector help. 
