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Well, the only problem I always encounter is the sealing around the boltholes. I solved this by tossing the original o-rings away, which are always of the wrong (cheap) material. Instead I made my own copper rings because the ones I can buy are just too thin.
The extra cooling aluminum valvecovers give is not for the heat coming from the head but from the oil in the head which has a better way of giving off its heat through the valvecovers. If the grooves would also be on the inside of the covers the effect would be even greater due to its bigger surface.
So far they always worked for me and never leaked.
cheers,
Richard
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