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Old 01-15-2003, 06:44 PM
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Post need recommendation for injection small block 400

I have a small block 400 in a gmc Jimmy and would like to switch out the carburator for fuel injection. Any recommendations? Is it a hassle to get the fuel curve right and is installation easy or involved. Thanks in advance for any Ideas!

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Old 01-16-2003, 02:02 PM

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Womper, I'm far from an expert on the subject, but since no one has responded, here goes. Jeff Hartwell has a book out called Powerpro Series Fuel Injection, Installation, Performance Tuning, Modifications, Published by MBI. ISBN 0-8-87938-743-2. This is a great start to help you make up your own mind. I have installed an after market system on my 383 Stroker Motor, but have not fired it up since I am doing a frame off rework of my vehicle. A friend of mine has built a 406 brute of an engine and installed a Holly unit which will utilize a GM computer. He will have a chip burned to support his particular modifications. Since he used GM fast burn heads, he basically custom built his own base plate. Recently, the correct base plate for these heads has gone into production. Some of the things I have learned and beleive to be true are: Fuel injection motors run smoother; replacing carbs with EFI does increase the horsepower of that motor; EFI will give you about 6 MPG increase over that same motor /vehicle combination with carb.; you will have much better cold and hot starting; fuel injection is more trouble free than carb system. The cheapest way to go is to get a 350 tuned port system and put on your SB 400. Installing an adjustable pressure regulator and 29#/hr injectors will give you all you need to feed your engine, unless it is highly modified. Edelbrock makes a superb unit, but you are looking at 2 grand. On thing, EFI does not like big cams!! 216 duration is about as big as you want to go.

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