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My grandfather is rebuilding his Volvo Duett and I'm helping rebuild the engine. The B18 engine is very much original, I doubt it has ever even had it's head open. This time I'm not looking for outright performance though, but rather best usability in a car intended for heavy loads. What bore/cam/combustion chamber would be the best? I've also got almost all the different carburettors used from 1964-1973 at my disposal from Zenith fixed jets to Strömberg singles to SU doubles.
 

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The biggest bore that makes sense with a B18 head is 87mm, although you'd probably need custom-made pistons for that (I have them made).

I'd use a Volvo K cam and the dual SUs.
 
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