I decided to build up my 95 lt1 a little bit and also because I will never find another 95 lt1 with 25k original miles and I want to enjoy it a little more. I don’t want to alter the stock appearance thought, even though it’s a camaro I liked to surprise some of newer camaro and corvettes. So here is my build along with a question. What size injectors should I run with a 226/232 .578/.574 110 LSA. – 1900-6200 RPM cam? Should the fuel pump be upgraded as well? The heads will be Crane Dbl Valve Springs (145 lbs seat and 370 lbs open) Steel retainers and locks 195 cc intake port flow about 260/180 CFM. The car is a 6spd and it will have a new hd clutch installed. The block is a 2 bolt and planning on studding the caps arp rod bolts with forged pistons for a 100 shot NOS setup. Planning on keeping the stock crank and rods. Thanks for any input.

 

Appears you have basically copied and pasted the "LT1 LE1" info from Lloyd Elliott's website, except you selected the shorter duration 226/232 cam over the 232/240.

Let's assume you are in the 390 rwHP range = ~450 flywheel HP x 0.070 = 31.5 #/HR. I would use at least 32 #/HR injectors, and upgrade to a 255 LPH pump. There would be no downside to using a 36#/HR injector, to allow for future upgrades.

You mention a 100-shot of N2O.. If it's a wet shot, that will not affect the injector size. If it's a dry shot, you have to indicate how you plan to get the extra fuel flow through the injectors. 255 LPH pump should be adequate.

 

If I had your engine set up, I'd be using 36LB injectors.....SVOs is I could get my hands on them.

KW

 

Yes, it is Elliots setup and he is doing the heads and intake. NOS is a dry shot. The cam is still in the air but it is the general area where I want to be, 232/240 powerband was my concern for a 2 bolt main.

 

How do you plan to add the extra fuel for the dry shot? Are you using the NOS 5176 kit that boosts the fuel pressure when you spray to increase fuel flow through the injectors? If so, you will need at least the high pressure version of the 255 LPH fuel pump, or the inline booster pump that comes with the NOS kit.

 

The kit has a booster pump, that brings up another question. What should the fuel preasure regulator be set to?

 

How does the kit raise the pressure? That will determine how you set things up. If it raises the pressure by applying a pressure regulated slipstream of N2O to the vacuum port on the fuel pressure regulator, you use a stock, non-adjustable FPR. The pressure applied to the vacuum port boosts the pressure only when you spray. That's based on the NOS 5176 kit, which I had way back in 1995. If you have something else, you have to explain how it works.

That brings up another issue... what type of injectors are you planning on? Some types, like the GM ball & seat injectors do not work well with elevated fuel pressure. So that's another issue you need to address. With my 5176 kit, and fuel pressure as high as 90psi, I ran Ford/Denso pintle type injectors, that had no problem with the elevated pressure.