Hi All:

I am retrofitting an 86 305 TPI setup onto a 383, and I ran into a problem with selecting the appropriate injectors, and I was hoping for some advice.

I need a 24# injector, and the stockers were 19# (and shot). So after looking around I purchased a set of Deka-Siemens 24# injectors which the vendor assured me would fit my TPI. Upon actually trying to install them I discovered that they are about a 1/4-inch too short.

So I started looking at injectors at Summit, and in an attempt to get it right this time, I decided to look closely at the specs given. Now I'm really confused, because the Accel injectors are listed as stock replacements, but their given measurement is the same height as the Siemens ones I just bought (2.7 inches). Looking at others, some appear to be the correct length (just over 3 inches), but are not listed for GM TPI or as stock replacements.

Further, the resistance ratings are different for each make, and the shop manual only says they have to be above 10 ohms.

So my questions boil down to:
1. Will any resistance rating work as long as all injectors are above 10 ohms and are a matched set?
2. Who makes a reliable 24# injector that will actually physically fit my TPI?
3. Who should I avoid?

Can anybody spare some advice here for a TPI newbie?

Thanks in advance!

 

1. usually injector should be 12-16 ohms I think

2. alot of people are happy with the ford SVO's, I had some accells and they were shorter than the stock injectors but they fit just fine

3.ACCEL, lots of people have had problems with them

 

Go with a set of Fords or LT1 injectors. Accels are horrible. I had them, they are horrible. Do a search for their injectors on the boards. Horrible reviews.

 

Stay away from Accel injectors, get the Ford SVO injectors. You'll be much happier.

Also, overall injector length isn't a concern, only the spacing between the o-rings. You can adjust for slight differences in injector height be either adding washers under the fuel rail or slightly grinding down the 4 spots on the intake where the fuel rail sits depending on which way you need to go.

 

Thanks for the advice!

I thought about grinding down the mounting posts for about 3 seconds, then decided against it because 1) I didn't want to chance that I'd have clearance problems with other compnonents, and 2) I didn't want to screw it up.

Accels: I pretty much got that impression from just having read a few threads here.

Fords: I had looked at these briefly, but I wasn't sure if they'd work with the GM TPI. Any particular model, or are they all the same size physically?

Venoms: I thought these looked interesting, and they seem to be physically sized right. Anybody tried these?

Anybody got any comment on the resistance value?

Thanks!

 

Basically there are two different types of injectors when it comes to resistance, high impedance and low impedance. If you're using a stock computer then you must use high impedance fuel injectors.

 

Stick with the Ford SVO's. If you try to cheap out you will find other non-SVO 24lb ford injectors that are sold for less, but they are not the same.

I believe Summit has the cheapest price for 8 SVO 24lb-ers, just over $200.

 

I just installed the ford 24# svo's . very nice..

If you go with the ford injectors you might want to get new O-rings for them. The ones they come with are a little smaller than stock. They will fit and work but if I had to do it again I would get the stock O-rings and put them on.

 

Re: Accel injectors.

My experience:

About 3 years, maybe 25K miles, and no problems. (21 b/hr at 45 psi w/o vacuum)

 

I bought a set of 22lb injectors from 5.0 motorsports off of ebay. Brand new take outs (???) Ford part # crosses over. They are a little shorter but have 2 grooves for the retaining clips. Car runs like a champ (89 L98 TPI). Think I paid $170.00 for the set. Pretty pink colour too!!