Blackta24

What 42lb injectors for direct replacement for a 2001 ls1?

Sigforty

If I remember right they are something like a early 2000 Pontiac GXP supercharger injector. They are white and the same body style as the ones the LS1 came with stock.

thunderstruck507

iTrader: (18)

that is correct, the supercharged 3800 injectors are 41.5# at 58psi rail pressure and easy to tune for

they typically sell in the classifieds here for $80-120 for a set of 8

LS6427

iTrader: (2)

Interesting......I never knew the 3800 SCed engines used that size......

Would those 41.5 lb injectors be plenty for my 390ci....N/A....?

Im looking for new injectors until I have to put real big ones in when I boost it later on.......

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thunderstruck507

iTrader: (18)

Not sure what HP level you will be at or what they support...

When my car was running it's best I was seeing high 60s-low 70s duty cycle. It was making an estimated 460-475 crank HP at the time I would say (dyno 390rwhp unlocked converter and closed cutouts). Trapped 95mph in the 1/8th in a 3700lb car.

LS6427

iTrader: (2)

It dynoed 400 RWHP.........but with the new heads, intake and TB......should go 450-460 RWHP. My current heads are terrible, they only flow 300cfm@.600.

I had these 42 lb injectors on my 427ci with 500 RWHP....so 41.5 pounders should be fine.

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thunderstruck507

iTrader: (18)

Ha, if my heads flowed over 275@.600 I would be shocked. Nearly stock just trimmed the intake valve guide boss, removed rocker boss, and sanded the ports. Exhaust has nothing but sanding rolls done to them.

Still a GM valve job, just lapped them in. 1 valve came from a different head even.