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OK, 1st off, thanks in advance for your time. The problem: 97 3.0 vulcan with cracked heads. The casting numbers are F6DE. I have available a set of A920 heads which look identical (I think they are for the flex fuel) and a set of F6DE's with the smaller 7mm valves. Will the heads with the smaller valves work with the same rocker arms as the heads prior to 7-13-98? If not, can I use the FFV heads?
 

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OK, 1st off, thanks in advance for your time. The problem: 97 3.0 vulcan with cracked heads. The casting numbers are F6DE. I have available a set of A920 heads which look identical (I think they are for the flex fuel) and a set of F6DE's with the smaller 7mm valves. Will the heads with the smaller valves work with the same rocker arms as the heads prior to 7-13-98? If not, can I use the FFV heads?

The flex heads have different CC's by 2 , so i would not use them to prevent issues. You can pretty much use any heads, but i would replace them in pairs if there not the same as yours.

This might help explain things:

Rebuilding The Ford 3.0L V6: Engine Builder
 

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