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Old 03-27-2003, 11:49 AM
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Post 390 2v econo to 390 gt

im wanting to turn my 2v 1973 390 econo engine into the equivalant of the 4v 390 gt motor, ive done some research and was told to replace the pistons with the earlier 4v motor and other parts from the same. im just wondering what are the other parts that would differ between the 2 motors other than of course the intake and carb.

[ March 27, 2003: Message edited by: 65galaxie500 ]</p>

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Old 03-27-2003, 11:52 AM
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also it appears that my 352 valves are the same as the 390, so would i be correct in assuming that the combustion chambers in the heads would be more suitable to boost my compression closer to that of the gt 390?

[ March 27, 2003: Message edited by: 65galaxie500 ]</p>
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Old 03-27-2003, 12:53 PM
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The GT engine had a CR a little over 10:1. That is too much on today's fuel. You need to aim for no more than 9:5:1. Most likely, both sets of heads you have have the same CC chambers and valve size.

How much time do you have? I can research this and mail you some tech information to save you a lot of trouble. Better yet, did you see that URL I gave to the other fellow about rebuilding the FE?
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Old 03-27-2003, 02:09 PM
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great, send me what you can, i do have some time before the motor gets put together so any advice and suggestions would be great and it seems like everytime i get a wild hair up my butt and want to do more than i really should or something i might regret you steer me right where i should be. thanks
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Old 03-28-2003, 01:22 AM
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This book will give you about all you will need to know to redo the 390. Most of what I have is advanced tech. If the book doesn't answer your questions, I will be happy to supplement it.



Go to;

<a href="http://www.motorbooks.com/" target="_blank">-Motorbooks.com-</a> and enter Catalog I.D. No. 102098 in the search feature.

This will also have casting codes and information that would take a week to draw here. You also need to find a machine shop that is familiar with this engine series.

Keep me posted...
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Old 03-30-2003, 04:39 AM
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Interesting Modification;

-FE 443 Stroker-
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Old 03-30-2003, 06:03 AM
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While the 443 conversion was interesting, it was a lot of work with an assortment of parts that could be duplicated much more reasonably with a 428 block and crank. Bore the block the same and offset grind the crank using undersize bearings in the stock rods and you'll only need to modify the pistons a little. My experience with 428s tells me that if you punch it out that much though (unless it's been sonic checked first) you're getting it pretty thin.
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Old 03-30-2003, 11:14 AM
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You have a good point...I wouldn't do it myself...but just thought I would bring it to the board's attention. Some can be very resourceful.
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Old 04-03-2003, 12:15 PM
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Is this enough FE for you?
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Old 04-03-2003, 03:32 PM
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SOHC it to me.
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