Loose injectors in ls6 intake...wrong o-ring?
Thread Starter
Teching In
Joined: Nov 2017
Posts: 4
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From: Tulsa ok area
Loose injectors in ls6 intake...wrong o-ring? So i have a ls6 long block i am building and recently scored a nice ls6 intake for $265. Started looking for injectors and went with a new set of 42lb injectors. The listing said they were for an ls1/ls6 and look just like any others ive seen for ls1/6. Heres the problem....theyre super loose in the intake and are able to wobble all around, so i was wondering if they are supposed to be all loose and the fuel rail holds them straight? Seems like it would cause a vacuum leak and i dont want that on a 400hp engine!! (Will have cam/intake/headers/heads) The top o ring fits TIGHT in my fuel rail which is what i expected out of the injector going into the ls6 intake.
I also have a youtube video of what im talking about looseness wise if that would help! Sorry for the noobish question but couldnt find any problems such as this anywhere i searched. Plus ive alaways worked on motorcycles and carbureated cars up to this point as far as fuel system work goes. Maybe im just crazy lol
Injector # on body is 0 280 155 968
ID of intake injector hole is .550
OD of lower injector o ring is .553- 555 depending on how tight i get the calipers.
Should the injectors be tight in the intake like the fuel rail?
I also have a youtube video of what im talking about looseness wise if that would help! Sorry for the noobish question but couldnt find any problems such as this anywhere i searched. Plus ive alaways worked on motorcycles and carbureated cars up to this point as far as fuel system work goes. Maybe im just crazy lol
Injector # on body is 0 280 155 968
ID of intake injector hole is .550
OD of lower injector o ring is .553- 555 depending on how tight i get the calipers.
Should the injectors be tight in the intake like the fuel rail?
Last edited by Deathstar24; Dec 11, 2017 at 11:14 AM. Reason: Proofreading, more info
Check inside the holes where the injectors go with a right-angle pick (just lightly, do not scratch anything) and see if you left behind one of the old injector O-rings. Those things tend to come off, and since they are black, you cannot really tell they are still in there. Don't ask me how I know.
^x2, I removed my fuel rail with the injectors and a couple of the O-rings were stuck inside the intake manifold because the small plastic piece on the bottom of the injector that holds the o-ring in place broke/snapped.
