[Manny]

Would standard 3.0 heads work on a 3.0 flex fuel motor?

 

[soundu]

Yes, they will bolt on. No, I would not do it.
The flex heads have a different shape combustion chamber and
2cc difference in size. If you only need one head, don't mix them.
If you replace non flex heads into a flex car, it may not run totally as
expected.

bob

 

[ffvulcanpowah]

I read that the compression ratio difference between standard vulcans and FFV Vulcans is from different pistons. Every source I've seen says the heads are identical.

 

[rudedog]

Qft