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rotorwrench · 05-18-2018, 01:36 PM

There have been flat head V8 cylinders bored through to the water jackets to get big sleeves installed. They usually leave a ledge around the bottom of the cylinder to locate & stabilize the bottom of the sleeve and good old JB Weld epoxy to help keep the cylinder and deck surfaces stable up top. One outfit did this to all eight cylinders in a 21 stud engine in order to get it out to 3 3/16" and use a 4-inch stroke crank so they could run the Great American Race in a 1935 or 36 Ford coupe (I don't remember which). It made it all the way without problems and I think it's still going. 255 CID is pretty big for an ole 221 engine. The 24 stud engines will go farther but the rest of the deck & valve pockets should be in good condition to start with.

05-18-2018, 01:36 PM	#3
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,440	Re: 59L block sleeving There have been flat head V8 cylinders bored through to the water jackets to get big sleeves installed. They usually leave a ledge around the bottom of the cylinder to locate & stabilize the bottom of the sleeve and good old JB Weld epoxy to help keep the cylinder and deck surfaces stable up top. One outfit did this to all eight cylinders in a 21 stud engine in order to get it out to 3 3/16" and use a 4-inch stroke crank so they could run the Great American Race in a 1935 or 36 Ford coupe (I don't remember which). It made it all the way without problems and I think it's still going. 255 CID is pretty big for an ole 221 engine. The 24 stud engines will go farther but the rest of the deck & valve pockets should be in good condition to start with.