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I'm not a 100% sure, but I think that the E-303 cam is the only one out of the three that you mentioned, that you can use without needing your pistons fly cut
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You can run all three without having the pistons flycut. The X has the most lift out of them, and altough cutting it a little close, its still fine with stock HO pistons.
The B cam, even with 1.72 rockers doesnt even make it close to needing the pistons flycut. The total lift would be 0.516" with 1.72's. Not exactly pushing it.
If you stay under 540" lift or so, then you wont need to have them flycut, unless ofcourse you have a pre-87 shortblock with the flattop pistons.