Maximum bore/stroke for a 1200?

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Stroke is easy to measure. Take a plug out and stick a rod inside on top of piston. Measure movement top to bottom and compare to stock.
 
In this revived thread, here's a European stroked crank I saved a pic of, awhile ago. It can allow 1724cc total bore & stroke. I suspect the cost of this work is > any valuation of any VMax I may have had!

VMax 1200cc to 1724cc via 76mm stroker crank and 85mm pistons.png

My machinist friend did these VMax heads using Suzuki cam followers for 1508cc.

VMax 1508 cc cyl bores.jpgVMax 1508 cc big valves.jpgVMax 1508 cc cams-Suzuki followers.jpgVMax 1508 cc disassembled.jpgVMax 1508 cc pistons.2.jpg

The machinist does it 'old-school.' He started his career working as a machinist for Crane Cams, where his dad also worked as a machinist. He went out on his own, these days most of his work is for wealthy Porsche owners and shops who cater to them, and offshore powerboat racers, both groups are used-to hemorrhaging $$$$.

A pic of the intake area:
VMax NOS 1500 cc.jpg

for when 1500cc plus isn't 'enough.'
 
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