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heres a tip, i've only used it on m10 but it would work on m20 as they are so similar in the valve train infact the m20 has a bigger rocker ratio so it would work better, if you looking for every fraction of valve lift, face some extra material of the inlet valve seats, it will sit the valve deeper in the head, thus pushing the stem through the head further, this will move the contact point of the valve adjuster and increase lift, go too far and the adjuster will walk off the edge of the valve, but on an m10 you can gain 0.020 + valve lift depending on where every thing started, more possibly on an m20
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