a little help please

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DA69

Senior Member
i want to place ferrea 1mm oversized valves in my b16a head. i have skunk springs and retainers and itr cams. my bottom is an ls with .25 overbore and ctr pistons. here is my question. i was told to run this setup with the 1mm over valves, i need to modify my pistons. is this true? if so what do i have to do? also the head has been shave 20 thosanths. thanx
 
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