Sorry so long to reply....
I went with the E-303 because I bought a bunch of parts for my motor as a package. I bought the heads,pushrods, rockers, and cam all together.
The maximum lift recommended for TFS TW heads is .540. An E-303 is .498 with a 1.6 rocker and with the 1.72's it comes to .538 I think.
If I were to do it again, I would get a custom grind and not have to worry about the added valvetrain geometry stress of the 1.72's.
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