The blockguard has nothing to do with the block bore or the head. I only use them in high compression all motor builds that make 220+ whp. If you want to buy one for your sohc, search for a company that makes them. I don't believe Honda put a blockguard in any of their sohc engines.
I know Blox makes block guards, and I'm pretty sure they have one for D-series engines. Just do some searching and you'll find prices. If I remember correctly they were between 60 and 100 bucks...
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