My 88 Olds wagone U/SA 10 Pennies

[SSDiv6]

Originally Posted by Jeff Stout

Also I was surprised when removing torque plate cylinders were. 0015 out of round up top. Bolted plate down again and checking cylinders were round again. It surprised me.

Normal for the the Oldsmobile 307 and 403 blocks.
They are of a lightweight design, light and have scalloped and windowed mains. For a full race engine, you can fill the block and used a girdle, or sleeve to a 307 bore size, a 1968 thru 1971 high nickel block.