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  1. D

    Valves and pistons hit.

    I shouldnt say the a6 pistons are "taller". Really, they are just not machined as deep as the z6 pistons, making room for the valves of the Vtec head.....
  2. D

    Valves and pistons hit.

    The a6 pistons are taller than z6 pistons. The z6 pistons are machined to fit the valves. I am building a motor for my sons car replacing the z6 block with a salvaged a6 block. Finding a lot more issues as I get further into it. Timing belt, water pump, tensioner, motor mount, etc...
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