I am installing the LT4 HC in my car and having the heads rebuilt. I have everything apart right now and was just wondering if it would be a good idea to upgrade my fuel injectors while I'm in there. If so, what injectors and will I need an adjustable fuel pressure regulator?

 

I had some home ported heads with larger valves, a HOTcam, and the other supporting bolt ons. While scanning the car at WOT I saw the injector duty cycle go up to around 92%. I would have liked to see it lower. I guess what I'm saying is that the stock injectors will work, but if you have some money laying around some bigger injectors wouldn't be a bad investment. You wouldn't need an adjustable fuel pressure regulator, but I think you'd need some tuning to get your air/fuel ratio in check.

 

Try to keep duty cycle to around 80%. The higher the cycle the more the injector is working, the higher chance for problems

 

Can any of the various mail order tuners adjust the pcm for bigger injectors if I wanted to run the svo 30# injectors? I'll just go with those if I get new ones.

 

yes,they should all be able to

 

svo injectors actually fllow almost 32#.Ford rates them at a lower pressure than GM pressures.

 

So what injectors would be good for my application?

 

The svo injectors should be fine.

 

Are you just refreshing the heads? Doing any port work? Larger valves?

 

I'm not having any port work done. Just a rebuild on the heads. I'm adding the hotcam kit, RKSport headers, 52mm TB, and a loud mouth exhaust. I'm also ditching the dual cat setup and running one high flow 3" cat.