Fuel Injectors Size Selection Guide

For your reference, use the above instructions to calculate fuel injectors size for your Corvette based on target peak horsepower.  Instructions courtesy of Precision-Flow.

C4, C5, C6 Corvette Factory Fuel Injector Sizes

1982, 1984: 67/68 lb/hr

1985: 24 lb/hr at 43.5 psi or 22.5 lb/hr at the factory 36-37 psi

1986-1993: 22 lb/hr at 43.5 psi

1994-1996: 24lb/hr at 43.5 psi

1990-1992 ZR-1: 20.5 lb/hr both injectors at 43.5 psi

1993-1995 ZR-1: 20.5 lb/hr both injectors at 43.5 psi (designed for ethanol)

1997-1998 LS1: 28 lb/hr at 53 psi

1999-2000 LS1: 26 lb/hr

2001-2004 LS1/LS6: 28 lb/hr

2005-2007 LS2: 33 lb/hr

2006-2011 LS7: 39 lb/hr

2008-2013 LS3: 43 lb/hr

2009-2013 LS9/ZR1: 52 lb/hr

24 thoughts to “Fuel Injectors Size Selection Guide”

  1. Hello Sirs or Manms,

    I have after-market injectors in my 1996 LT-4 Corvette with the following part number on them: A2316 17089225 please tell me what the brand in and what is the pounds of flow?

  2. what size fuel injectors do i need for my stock 85 corvette and if 24 pound injectors will work?

      1. I’m looking for a set of eight fuel injectors under $250.00 actually I would like to get the Bosch 11/22lb tpi and this is for a 1986 Chevy Corvette Indianapolis 500pace car one more thing I do not want remanufacture the eight injectors (must be new)

      2. What would happen if i put 24lb injectors in my car ? It’s a 1992 with the lt1 even if the size chart says 22lb

    1. Per the 1997-98 fuel injector with 350 hp,the car is a 1998 corvette.

      Your chart states 28 pounds, your formula comes out at 24 pounds.

      Which is correct, and why ?

      Thanks, James

      1. James , if you haven’t received an answer, I understand that the ’97-’98 “345 hp” factory rating for those engines was lower than the “actual” engine hp. From the many dyno charts and info I’ve seen for these motors the actual hp was typically somewhere in the 390-400 hp range. Similarly, the factory “405 hp” rating for the C5 Z06 cars was again less than the engine’s actual hp (typically around 420 hp).

  3. I’m building a 2003 Chevy 6.0 out of a an Express. It’s not stock, the list is; LSXr 102 MM with matching throttle body, stock 317 heads, Wiseco flat top pistons with valve relief, Comp Cam .637 Intake .615 exhaust 111° lobe separation. My questions are horsepower and torque and what size injectors to use..
         Thanks in advance Aaron.

    1. I’d recommend getting together with a local performance shop, there are plenty that specialize in LS engine builds that will have a good idea of how much power to expect, as well as how to feed it.

  4. In reference to target peak HP…. is that at the crank or at the wheels? Asking for the obvious dyno numbers as opposed to figuring the possible crank power.

  5. Will increasing the fuel injector size alone improve performance and add hp to my 1985 TPI Vette or does it require other significant modifications? (i.e: bigger cam, headers, pistons, valves, etc.)

    1. No, more fuel needs more air for example to produce more power. So without any other modifications it’ll make your engine run worse especially on a stock tune.

    1. The LS3 injector is shorter in length compared to a LS2 injector. FAST offers a injector spacer/extension kit “146025-KIT” that will allow for LS3/LS7 injectors to fit the LS2 intake. Your LS2 fuel rails will work correctly so all you need is the spacers and O-rings that are included.

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