I agree it's NOT an ideal situation, but I think saying that it will break the crankshaft is a bit dramatic!
The weight of the pistons (should be equal) is MUCH more important than individual cylinder compression.
And he did NOT post the weights of the pistons he used. Even though the CR is different the WEIGHT of the pistons MAY be the same... or NOT!
The other factor would be if the higher-compression cylinder pre-ignites with the gas being used and the load on the engine.
About 20 years ago I got an SBC Chevy 350 block from a machinist friend that had 2 cylinders bored .060" OS, and the other six standard.
We put it together with 6 OEM pistons and 2 aftermarket OS pistons. We weighed them and all 8 were darned close in weight even with the different size and manufacturer.
Some "experts" said it would shake like a *@^$%. Others said it would be OK.
It was. It runs about as smooth as any other run-of-the-mill SBC.
I still have the old pickup and it still runs.
(NOT saying what we did is good practice or that the engine is as smooth as a "blueprinted engine", but it did work OK for our non-racing purpose!)
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Today's Featured Article - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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