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Why 86.5 over 87? Both are safe bores for stock sleeves. I've seen more than a few stock block SRs at 87 mm be pushed over 600 rwhp without any issue.
You're only talking about 5 sheets of paper of thickness... not much material strength, but a decent bump in displacement over the whole stroke.
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S13 Hatch - Goes around tracks quickly
DEFSPORT
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