Brian.B

can you put injectors from a 89 model truck into an 91.5,,,i was wandering cause i turned my fuel pin around 90 degrees and didnt feel a difference ,how much of a difference would it make if you could ,,,and one more thing would adding a 3200 rpm spring help me any...thanks

Onemoparnut

No they won't fit.

Douglas2

They won't fit because the early injectors have a 9mm tip and the later ones have a 7mm tip. I think the later ones have a different spray angle too.
cheers,
Douglas

jimbo486

Non i/c to i/c won't work because of what Douglas said. However, if you do buy aftermarket injectors, they come with 7mm nozzles. Therefore, you will need sleeves/adapters to make them work in your non i/c, 9mm head. Spray angles are a little different, non i/c spray at 155* and i/c spray at 145*. Some guys have found that running 145* with a non i/c pistons seems to burn fuel really well.

A 3200rpm spring will give it a better feel. Throttle response will be better as well. A great (and cheap!) mod for our pumps.

dieselJon

I did for $125...

$100 for injectors
$25 for machine shop to turn them down to 7mm.

Spray angle is going to be outside the bowl but you can counteract that with a timing bump. Basically, you add POD injectors to it. I know, $ for $, I would do this again in a heartbeat.

Richie O

Bumping timing will make it spray out worse. It makes it pop earlier, and that causes it to come out of the bowl.

jimbo486

Maybe he meant in the other direction

dieselJon

Yeah, I had it backwards.

Never mind the timing bump... I never got around to it but I was just doing what the guys with PODs had done.