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piston markings

can anyone tell me if there are any markings on the standard pistons?

i have my engine stripped at the moment and the pistons have markings on the crown and i not sure if they standard or not.

the markings are 2 WYD 30P1 05.....

any clues to these markings will be greatfully recieved.

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    guess not many of you get this far into your engines eh?

    i'll speak with a proper zx specialist tomorrow and get my info.

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    best way to check is to measure the piston.thats what i always do.check the manual for oversizes and compare.then pray yours arent at maximum!.

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