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post #6 of Old 12-09-2012
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Re: Rebuilding a Yanmar YSM-12 using YSB head

Some manufacturers may offer short or long blocks. IIRC, a short block was just the block without the head, the long block was the block and the head, maybe I got it backwards? been a long time ago. Both had all the moving parts replaced with new, or re-built or re-furbished components and required your old block and or head to be returned to them, known as a "core". However, if Yanmar doesn't offer them or re-built engines you may have to find one to re-build on your own. Changing to another Mfr's engine would likely be a complex and difficult job as likely nothing fits.

Paul T
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