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rotorwrench · 09-07-2020, 05:38 PM

I've heard of engines being bored out till it opened to the water jacket. Folks were trying to get enough out of there to install sleeves for a larger bore but still have reliable cylinder wall thickness on an old 1937 21-stud block. They did all 8 cylinders that way but they left a step at the bottom for a sleeve seat. They used JB-weld epoxy at the top & bottom to help seal it up and keep the deck a bit more stable. The 221 was made into a 255 by use of a modified 8CM crankshaft. They put it in a 1935 coupe & ran the Great American Race with it and made it all the way.

The only maybe is whether the cylinder wall on your block was distorted to any major degree and whether the crack goes all the way to the bottom or not. A person could stop drill it or radius out the lower end of the crack but you would need the step down at the bottom to be intact. The deck also needs to be intact.

09-07-2020, 05:38 PM	#12
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,436	Re: Do you think a sleeve will fix this? I've heard of engines being bored out till it opened to the water jacket. Folks were trying to get enough out of there to install sleeves for a larger bore but still have reliable cylinder wall thickness on an old 1937 21-stud block. They did all 8 cylinders that way but they left a step at the bottom for a sleeve seat. They used JB-weld epoxy at the top & bottom to help seal it up and keep the deck a bit more stable. The 221 was made into a 255 by use of a modified 8CM crankshaft. They put it in a 1935 coupe & ran the Great American Race with it and made it all the way. The only maybe is whether the cylinder wall on your block was distorted to any major degree and whether the crack goes all the way to the bottom or not. A person could stop drill it or radius out the lower end of the crack but you would need the step down at the bottom to be intact. The deck also needs to be intact.