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Old 03-26-2007, 10:31 AM
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Fuel Injection for 65 Olds 442, 400cu in

I have had this crazy desire to convert my 1965 Olds 442, 400 cu in engine to fuel injection. The problem as I see it, there is not a lot out there for Oldsmobile engines, especially the older ones. The 65 400 cu in engine as a different valve angle than 66 and later also. I want to keep the same/original heads, so I believe that my only choice/option is a throttle body set up. Has any one played around with such a project and/or have ideas they can share? By the way, fuel injection will be new territory for me also. Thanks for taking the time to read this! John

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Old 03-26-2007, 05:29 PM
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My son owned a '70 Challenger with a retro-fitted EFI setup. It was a Holley Pro-Jection unit (2 barrel) and seemed simple, self-contained, easy to install and manage, and worked really, really well. Cold mornings (well, cold here is high 30's) it'd fire right up, idle at proper speed, and never stall out. It ran like a new car with EFI. The way carbureted cars never quite seemed to run, no matter hard we tried to keep them in tune. The Challenger had the "closed loop" added option for O2 sensing in the exhaust. My son and I installed and removed it repeatedly for CA smog reasons, and I really think a complete install (from brand new) could be done in a couple of days. Let me know what you decide.

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Old 03-26-2007, 06:05 PM

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There are custom EFI builders out there that can help you out, but it is going to get pricey. They will take a good performance intake that fits your 400 motor and machine the ports for the injectors and the bosses and threaded holes to mount the fuel rails. They will either convert a carb to an air valve or modify an air valve to fit your carb mounting flange. They will then make the wiring harness to mate up with the selected ECU and you are on your way. The selected ECU will have a big bearing on the overall cost and is dependent upon the bell and whistles that let you program the ECU. I do not know of any after market producer of an EFI for your motor.

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Old 03-27-2007, 08:01 AM
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There actually are a couple of EFI setups for big block Olds motors available, mainly to accommodate the GMC motorhomes that use the Toronado drive and 455 Olds.

Rance makes a rather expensive port injection kit:


Howell makes a throttle body kit (scroll to the bottom of the page):


Finally, here's an interesting DIY setup on a small block 403:

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