Tim Newton

19lb Bosch 5.0/305 TPI Fuel Injectors. The Bosch Design 3 fuel injectors are .125 inch (3mm) shorter than the stock TPI fuel injectors and don’t fit using a factory fuel rail. Same applies to 22 and 25lb injectors.
I have bought the new Bosch injectors, can anyone refer me to who can supply injector lower seats/adapters to fix the height problem.

ULTM8Z

Lots of people are using Bosch III injectors.

As long as the o-rings seat in the bores you're fine.

vinny R

Southbay Fuel Injectors. They sell those and IIRC you have to double up the bottom O-rings. Southbay should have whatever it is you need to make those work, at least the install part.

Tim Newton

The fuel rail is stock but the intake manifold is GM aftermarket, and has quite a deep bevelled opening at the top of the injector bore. The injector is more than half way down the length of the lower bore before it fully passes the bevelled edge and completely seals.
I no longer have the factory head to compare. The top and bottom o-rings will just seat in their respective bores when the injector is carefully centred (not using the rail clips) but when it is fully seated at the bottom the top o-ring is just out of the rail (by about half the width of the o-ring). I suspect that engine vibration and heat exchange over time would cause the injector to drop fully into the lower bore, with leakage around the top.The factory injectors are Bosch design 1, and fit perfectly when clipped at the rail.

Tim Newton

Yes, SouthBay also have manufactured adapters but these are only sold with the injectors, not separately.

blacksunshine'91

iTrader: (10)

Contact them, don't just assume they won't help. They are great people. Give them a chance.

Tim Newton

Agree, SouthBay have been great in the past but the initial request to buy adapters separately was unsuccessful. I will contact them again to see if they can assist.

southbay08

so the reason why we do not sell the adapters separately is because you cannot just put them onto the bottom of the injector....if you do you'll have a vacuum leak because they will be loose. When we apply them they are on permanently.
The bosch 1's fit because you are using the clips.
You can always double up on the orings....
One will go on the bottom of the injector above the little plastic piece and one will go above that into the little groove. If you opt for the double orings....when you install them do not push them all the way into the intake.
The oring that is in the groove needs to be visible on the outside of the intake otherwise you will be defeating the purpose.

Which intake do you have anyway?

We only use the adapters for stock intakes and rails. You may not need the adapter. Let me know

Tim Newton

I have a GM TPI lower intake manifold stamped 14081005 (Camaro 1985), installed new a few years ago.

southbay

If they are too short then just use the double oring set up

Tuned Performance

iTrader: (92)

gm winters casting 14081005 is stock 90 degree center bolt 85-86 tpi
just double up the o-rings if you don’t have the press on adapters.

southbay08

again...the adapters are not just press on. They need to be on the injectors permanently. They cannot be loose and you should not be able to move them at all otherwise there will be a vacuum leak.
Where are you located?
Send them in to us and we'll be more than happy to apply the adapters for you....no charge for the adapters.

Tim Newton

I’ve been told that placing a additional o-ring in the injector groove above the lower ring was standard practice for years before adapters were available.
I want the best fix. Is this with the double o-ring or the adapter?

blacksunshine'91

iTrader: (10)

Dude, send them to Southbay and let them do it right. Yes, the double O-ring will work, but SB is going out of their way to help you out.

southbay

That is correct like i said we'll be more than happy to apply them to your injectors for you. Just let us know

Tim Newton

That’s a great offer to help me out.
I am in Australia and will pay the insured shipping both ways.
Confirming these are Bosch 274cc/min EV6 injectors to be fitted to a 1985 305 Camaro TPI with stock rails and intake.

If this is OK, what is the expected turn around time from when you receive the injectors to shipping back?

Thanks Tim

southbay

Thought you were local.
Well As long as you have a stock intake and rail you will not have a problem with fitment. We can get them back out to you same day...depending on what time we receive them....or the next day

Tim Newton

I will ship these tomorrow, expect in 8-10 days. If you want me to address these to a specific receiver, please let me know.
The shipment will include email and return details etc.

Thank you for assisting, as you would imagine this level of technical help and service just isn’t available Down Under.