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 - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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