My new motor will be going in after Christmas and I'm trying to figure out what injectors to use. I will have a ZZ4 shortblock with Fast Burn heads and LT4 Hot cam. I will also be going with a modified LT4 intake manifold. All of this will be controlled with an Ed Wright custom prom but I need to know what size injectors will I need. I am thinking that 24 lbs injectors would be too small considering that's what stock LT1's use. I also read that LT4's used 26 lb and so do LS1's so that might be about what I need. Would 30 lb be too big? I'm thinking I'll be making around 400 hp at the crank. Let me know what you think.

Stephen

 

The 24lb injectors will be all you need. That's all I'm running now and have plenty of room to work with. Motor is making about 400hp/480tq. Good luck!

 

I run 24# SVO injectors with no problem

 

Also the SVO injectors are rated a little different and are about the same as the GM 26#