I tore down a 1953 263 to see if it needed anything before I drop it into my 1951 Special.
Everything was fine, except two cylinders had broken compression rings.
My calipers aren't precision enough to measure out to 3 decimal places and I'm not so sure about it's accuracy of the last digit with two decimal places, so I'm not able to determine if it has standard pistons or .005 oversize.
The pistons have part #1318467 cast into the side by the wrist pin. They also have "Alcoa LO-EX" and the word "Buick" cast into them. Can someone please tell me by the part number if these are standard pistons? or oversize, and by how much?
The clearance on the bearings checks out in spec with plastigauge, and again, I can't measure the crank journals accurate enough to know if it's been reground, and don't need to know, but I'm curious if anyone can tell me if rod bearings with "GMMA 905" stamped into the backside are standard or oversize?
One last question - where is a good place to buy rings?
Thanks!
Dave