what size headgasket?

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kxpro06

97' Del Sol Si Ls/Vtec
so yea im building a ls/vtec, but my cylinder walls have been bored and honed .25mm over with oversized pistons. what size headgasket do i need to buy? 81 or 81.5? thanks!
 
anybody? common sense would tell me to get 81.5 but i didnt know if stock would still possibly work.
 
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